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JL Audio 450/4V2 User's Manual

1. 12VDC Ground Remote Signal From 1 amp 2 3 amp 4 All off On Off 30Hz x1 x10 Off 12dB 24dB Low High x1 x10 Off 12dB 24dB Low High Either 7s E 130 FilterType I InputMode 75 E 10 akost feature low pass oina 60 200 60 200 Cire JL AUDIO 450 4v2 F Left gralt Bandpass Four Channel System Amplifier mono when 50 500 LP BP HP z 2ch ch 50 500 p fe a s f a2 7 Left Output Right Output Bridged 300W x 1 3 80 deue Filter Freq Hz Th A s HP Filter Freq Hz To aun Bridged 1SOW x 1 3 80 28 JL Audio 450 4v2 Owner s Manual NOTES NOTES 30 JL Audio 450 4v2 Owner s Manual 31 LIMITED WARRANTY AMPLIFIERS USA JL AUDIO warrants this product to be free of defects in materials and workmanship for a period of ninety 90 days from the original date of purchase The warranty term is extended to two 2 years if installation is performed or approved by an authorized JL AUDIO dealer proof of installation or approval required on purchase receipt This warranty is not transferrable and applies only to the original purchaser from an authorized JL AUDIO dealer Should service be necessary under this warranty for any reason due to manufacturing defect or malfunction JL AUDIO will at its discretion repair or replace the defective product with new or remanufactured product at no charge Damage caused by the following is not covered under warranty acci
2. wire to the Remote terminal to see if the amplifier turns on get a distorted attenuated sound coming out of the speaker s Check the speaker wires for a possible short either between the positive and negative leads or between either speaker lead and the vehicle s chassis ground If a short is present you will experience distorted and or attenuated output The Low light will illuminate in this situation It may be helpful to disconnect the speaker wires from the amplifier and use a different set of wires connected to a test speaker Check the nominal load impedance to verify that each channel of the amplifier is driving a load equal to or greater than 1 5 ohms in stereo mode 3 ohms bridged Check the input signal and input signal cables to make sure signal is present at the Amplifier Inputs and the cables are not pinched or loose It may be helpful to try a different set of cables and or a different signal source to be sure My ampilifier s output fluctuates when I tap on it or hit a bump Check the connections to the amplifier Make sure that the insulation for all wires has been stripped back far enough to allow a good contact area inside the terminal block Check the input connectors to ensure that they all are making good contact with the input jacks on the amplifier 24 JL Audio 450 4v2 Owner s Manual My amplifier shuts off once in a while usually at higher volumes Check yo
3. e Digital AC Voltmeter e CD with a sine wave test tone recorded at 0 dB reference level in the frequency range to be amplified for that set of channels 50 Hz for subwoofer channels 1 kHz for a midrange application The CleanSweep Calibration Disc contains the appropriate test tones and is available for sale at http store jlaudio com Do not use attenuated test tones 10 dB 20 dB etc The Nine Step Procedure follow this procedure for each pair of channels 1 Disconnect the speaker s from the amplifier s Front Speaker Outputs and Rear Speaker Outputs connectors 2 Turn off all processing on the source unit bass treble loudness EQ etc Set fader control to center position and subwoofer level control to 3 4 of maximum if used to drive the 450 4v2 3 Switch the Input Voltage to Low and turn the Input Sens control on both sets of channels all the way down 4 Set the source unit volume to 3 4 of full volume If either set of channels is being driven by a source unit s dedicated subwoofer output also adjust the source unit s subwoofer level control to 3 4 of maximum output This will allow for reasonable gain overlap with moderate clipping at full volume 5 Using the chart below determine the target voltage for input sensitivity adjustment according to the nominal impedance of the speaker system connected to each set of outputs 6 Verify that you have disconnected the
4. MF and high frequency HF speakers and are separately filtered to send appropriate frequency ranges to each speaker system The most common application of tri amplification in mobile audio is to drive a subwoofer system from one or more amplifiers or channels LF channels mid range speakers from a separate amplifier or set of channels MF channels and high frequency speakers from a separate amplifier or set of channels HF channels One such configuration is to run subwoofers off the LF channel s mid bass speakers off the MF channels and a passively crossed over mid high frequency component speaker systems on the HF channels Another approach is to run subwoofers off the LF channel s mid woofers off the MF channels and tweeters off the HF channels all actively crossed over By activating the CH 1 amp 2 bandpass filter feature the 450 4v2 can easily be configured to drive a tri amplified system in conjunction with a separate subwoofer amplifier that includes a low pass filter CH 3 amp 4 of the 450 1 will drive the HF speakers 75W x 2 CH 1 amp 2 will drive the MF speakers 150W x 2 and the separate subwoofer amp s will drive the LF speakers subwoofers Input connection options for the Tri Amplified Stereo mode are as follows A No User Adjustability Required a basic source unit or processor with left and right stereo outputs Input Connections a single pair of stereo source unit outputs is connected to the
5. This feature takes advantage of convection and radiation effects to remove heat from the amplifier circuitry For optimum cooling performance the vertical heat sinks located at the back of the amplifier should be exposed to as large a volume of air as possible Enclosing the amplifier in a small poorly ventilated chamber can lead to excessive heat build up and degraded performance If an installation calls for an enclosure around the amplifier we recommend that this enclosure be ventilated with the aid of a fan In normal applications fan cooling is not necessary but you still need to follow some basic guidelines e Amplifier mounted vertically with heat sink fins pointing up Optimum e Amplifier mounted horizontally right side up Good e Amplifier mounted horizontally but upside down Fair not recommended if there is less than 1 inch 2 5 cm clearance above the amplifier heat sinks e Amplifier mounted vertically with heat sink fins pointing laterally Fair e Amplifier mounted vertically with heat sink fins pointing down Poor not recommended If mounting the amplifier under a seat make sure there is at least 1 inch 2 5 cm of space above the amplifier s outer shell to permit proper cooling Safety Considerations Your amplifier needs to be installed in a dry well ventilated environment and in a manner which does not interfere with your vehicle s safety equipment air bags seat belt systems ABS brake systems etc
6. You should also take the time to securely mount the amplifier using appropriate hardware so that it does not come loose in the event of a collision or a sudden jolt to the vehicle Stupid Mistakes to Avoid e Check before drilling any holes in your vehicle to make sure that you will not be drilling through a gas tank brake line wiring harness or other vital vehicle system Do not run system wiring outside or underneath the vehicle This is an extremely dangerous practice which can result in severe damage to your vehicle and person e Protect all system wires from sharp metal edges and wear by carefully routing them tying them down and using grommets and loom where appropriate e Do not mount the amplifier in the engine compartment under the vehicle on the roof or in any other area that will expose the amplifier circuitry to the elements CH 182 CH 384 CH 384 Chassis Ground Infrasonic Filter Filter Slope CH 1 amp 2 Input HP Filter Slope Input Sensitivity Connector On Off Switch Selection Defeat Sensitivity Control Selection Defeat Control pg 6 pg 11 CH1 amp 2 P9 9 cHi amp 2 P9 8 cH3g4 P99 cH3 amp 4 P9 8 12V Power Remote Turn On Preamp Output CH 1 amp 2 Bass EQ Filter Frequency Input Voltage Filter Frequency Input Voltage CH 384 Connector Connector Signal Selector Speaker Outputs On Off Switch Range Selector Range Selector Range Selector Range Selector Speaker Outputs pg 6 pg 7 pg 10 pg 11 pg 11 p
7. s manual for proper adjustment Ea IMPORTANT The Summed Center Channel methods outlined below do not create a true center channel they simply sum left and right signals to the center speaker system This is not as desirable as a true center channel from a multi channel source but it can be used to create a convincing sound stage in some applications B Summed Center Channel No User Adjustability Required a basic source unit or processor with left and right stereo outputs Input Connections a single pair of stereo source unit outputs connected to the CH 1 amp 2 inputs of the 450 4v2 select 2ch on the Input Mode switch in the CH 1 amp 2 Input Section Connect the subwoofer amplifier inputs to the preamp outputs of the 450 4v2 Select 1 amp 2 on the Signal From switch in the Preamp Output Section Result the relative level of all channels will be fixed by the 450 4v2 s Input Sens settings and will not be user adjustable from the front of the vehicle C Fade Between Summed Center Channel Level and Left Right Level with Non Fading Subwoofer Level Required a source unit or processor with front and rear pairs of stereo outputs Input Connections one pair of stereo source unit outputs is connected to the CH 1 amp 2 inputs of the 450 4v2 select 4ch on the Input Mode switch in the CH 1 amp 2 Input Section A second pa
8. 2 1 5 40 11V 14 5V Rated Power Bridged 150W RMS x 1 3 80 11V 14 5V THD at Rated Power lt 0 03 40 per channel 20 Hz 20 kHz Signal to Noise Ratio gt 108 5 dB referred to rated power A weighted 20 Hz 20 kHz noise bandwidth Frequency Response 5 Hz 30 kHz 0 1 dB Damping Factor gt 200 40 per ch 50 Hz gt 100 20 per ch 50 Hz Slew Rate 25V us Channel 3 amp 4 Filter State variable 12 dB octave Butterworth or 24 dB octave Linkwitz Riley High Pass with continuously variable cutoff frequency from 50 500 Hz switchable to a range of 500 5000 Hz via x10 switch Preamp Output 2 Channel pass through type switch selectable to pass signal from CH 1 amp 2 inputs only from CH 3 amp 4 inputs only or from all four inputs summed Dimensions LxWxH 19 70 in x 9 25 in x 2 36 in 500 mm x 235 mm x 60 mm Due to ongoing product development all specifications are subject to change without notice 27 INSTALLATION NOTES Use this diagram to document your amplifier s switch and control positions CH 1 amp 2 Input Section CH 3 amp 4 Filter Section CH 3 amp 4 Input Section CH 3 amp 4 Speaker Outputs CH 1 amp 2 Speaker Outputs CH 1 amp 2 Bass Control CH 1 amp 2 Filter Section Freq Range High Pass Filter InputVoltage Input Sens Preamp Output Section BassEQ Infrasonic Filter Freq Range Filter Mode Slope InputVoltage Input Sens
9. CH 1 amp 2 inputs of the 450 4v2 select 2ch on the Input Mode switch in the CH 1 amp 2 Input Section Subwoofer amplifier inputs are connected to the preamp outputs of the 450 4v2 Select 1 amp 2 on the Signal From switch in the Preamp Output Section Result the relative level of all channels will be fixed by the 450 4v2 s Input Sens settings and will not be user adjustable from the front of the vehicle B Fade Subwoofer Level vs MF HF Level Required a source unit or processor with front and rear pairs of outputs is required Input Connections one stereo pair of source unit outputs is connected to the CH 1 amp 2 inputs of the 450 4v2 select 2ch on the Input Mode switch in the CH 1 amp 2 Input Section and the second stereo pair of source unit outputs is connected to the subwoofer amplifier inputs In this mode the 450 4v2 s preamp output is not used Result the user has the ability to adjust the level of the subwoofer channel relative to the mid and high frequency channels via the source unit s fader control without exceeding the maximum clean output level set by each 2 amplifier section s Input Sens controls C Subwoofer Level Control Only Required a source unit or processor with left right and dedicated subwoofer outputs is required Input Connections one stereo pair of source unit outputs is connected to the CH 1 amp 2 inp
10. Configures the filter for CH 1 amp 2 to attenuate frequencies above or below the selected filter frequency at a rate of 12 dB per octave Butterworth alignment 24dB Configures the filter for CH 1 amp 2 to attenuate frequencies above or below the selected filter frequency at a rate of 24 dB per octave Linkwitz Riley alignment Depending on the speaker system and the vehicle different filter slopes may be required to produce a smooth transition between the sound of different speakers in the system Experiment to find the slope which best matches the acoustic requirements of the system The sharper 24dB setting will do a better job of protecting small speakers with limited power handling The shallower 12dB octave setting allows the rear speakers to reproduce more low frequency content 3 Freq Range Control When thrown to the right this switch multiplies the cutoff frequency selected by the rotary Filter Freq Hz control by a factor of 10 In the x1 position the range of the rotary control is 50 500 Hz as marked In the x10 position the range of the rotary control is 500 Hz 5 kHz 5000 Hz 4 Filter Freq Hz The filter frequency markings surrounding this rotary control are for reference purposes and are generally accurate to within 1 3 octave or better If you would like to select the filter cutoff frequency with a higher level of precision consult the charts in Ap
11. The combined output of the two channels provides twice the output voltage available from a single channel The 450 4v2 has been designed for bridging of its channel pairs without the need for input inversion adaptors ction CH 3 amp 4 Speaker Outputs Bridged 150W x 1 3 80 To bridge a pair of channels use the Left and Right speaker connectors only the Left and Right remain unused Then connect a mono signal to both left and right RCA inputs for that channel pair This requires an RCA y Adaptor like the JL Audio ECS model XB CLRAICY 1F2M sold separately When bridged each channel pair will deliver optimum power into a 3 80 load Operating bridged channel pairs into a load lower than 3Q is not recommended Because a bridged pair of channels requires that both channels receive input you need to connect both left and right RCA inputs to the bridged channel pair s inputs Connection of only one RCA input will result in reduced power output increased distortion and can cause the amplifier to overheat Do not do this Instead use a Y adaptor to split the mono signal into both left and right RCA inputs 12 JL Audio 450 4v2 Owner s Manual STATUS INDICATOR LIGHTS PROTECTION CIRCUITRY There are three status indicator lights on the top of the amplifier These are as follows 1 Power Green lights to indicate that the amplifier is turned on and operating n
12. boost circuit including the amplifier s Bass EQ and source unit tone controls or EQ circuits EQ cuts will not require re adjustment CHANNELS 3 amp 4 Nom 80 24 5V 49 0V TON 34 6 V 69 245V 424V 73V 30 0 V 40 24 5V 34 6 V 73V 24 5V 30 21 2V 30 0V 5 0V 21 2V 20 17 3V not recommended DANI not recommended 1 5Q 15 0 V not recommended 0 6 V not recommended 22 JL Audio 450 4v2 Owner s Manual 23 APPENDIX C TROUBLE SHOOTING How do I properly set the input sensitivity on my amplifier Please refer to Appendix B page 22 to set the input sensitivity for maximum low distortion output My amplifier doesn t turn on Check the fuse not just visually but with a continuity meter It is possible for a fuse to have poor internal connections that cannot be found by visual inspection It is best to take the fuse out of the holder for testing If no problem is found with the fuse inspect the fuse holder Check the integrity of the connections made to each of the 12VDC Ground and Remote terminals Ensure that no wire insulation is pinched by the terminal set screw and that each connection is tight Check to make sure there is 12V at the Remote connection of the amplifier In some cases the turn on lead from the source unit is insufficient to turn on multiple devices and the use of a relay is required To test for this problem jump the 12VDC
13. low frequency content 2 Freq Range Control When thrown to the right this switch multiplies the cutoff frequency selected by the rotary Filter Freq Hz control by a factor of 10 In the x1 position the range of the rotary control is 50 500 Hz as marked In the x10 position the range of the rotary control is 500 Hz 5 kHz 5000 Hz 8 JL Audio 450 4v2 Owner s Manual 3 Filter Freq Hz The filter frequency markings surrounding this rotary control are for reference purposes and are generally accurate to within 1 3 octave or better If you would like to select the filter cutoff frequency with a higher level of precision consult the charts in Appendix A page 22 of this manual Preamp Output Section The 450 4v2 incorporates a pass through preamp output section so that additional amplifiers can be added to the system This pass through pre amp output can be configured three different ways using the switch labeled Signal From in the Preamp Output Section Preamp Output Section CH Signal From Left Output Right Output 1 1 1 amp 2 The preamp output delivers the same signal that is connected to the 450 4v2 s CH 1 amp 2 Inputs This mode is useful for feeding a subwoofer amplifier when the 450 4v2 is being used to drive front and rear speaker systems This preamp output mode will track the signal level of CH 1 amp 2 allowing
14. operation of all four amplifier channels with one or two pairs of input signals 1 Input Mode Switch If you wish to operate all four channels of the 450 4v2 with a single pair of stereo inputs select the 2ch position on the Input Mode switch and connect a single pair of input cables to the input jacks in the CH 1 amp 2 Input Section In this mode the amplifier will route the signals connected to the CH 1 amp 2 inputs to CH 3 amp 4 as well If you wish to use separate inputs for CH 1 amp 2 and CH 3 amp 4 to allow front to rear fading for example and the source unit is equipped with front and rear outputs select 4ch on the Input Mode switch located in the CH 1 amp 2 Input Section In this mode you must connect separate pairs of input cables to each input section 2 Input Voltage Range A wide range of signal input voltages can be accommodated by each of the 450 4v2 s input sections 200mvV 8V This wide range is split up into two sub ranges accessible via switches located in each input section of the amplifier Be aware that each 2 input section s Input Voltage switch will have to be configured regardless of how many input cables are actually feeding the amplifier The Low position on each Input Voltage switch selects an input sensitivity range between 200mV and 2V This means that the Input Sens rotary control will operate within that voltage window If
15. s turn on lead can be connected to 12V via a switch that derives power from an ignition switched circuit The 450 4v2 s Remote turn on connector is designed to accept 18 AWG 8 AWG wire 12 AWG is more than adequate for this purpose To connect the remote turn on wire to the amplifier first back out the set screw on the top of the amplifier using the supplied hex wrench Strip 1 2 inch 12mm of wire and insert the bare wire into the receptacle on the front panel of the amplifier seating it firmly so that no bare wire is exposed When using smaller wire it may be necessary to strip 1 inch of insulation from the wire and fold the bare wire in half prior to insertion While holding the wire in the terminal tighten the set screw firmly taking care not to strip the head of the screw and making sure that the wire is firmly gripped by the set screw CH 1 amp 2 CH 3 amp 4 INPUT SECTIONS The 450 4v2 has two separate input sections one for CH 1 amp 2 and another for CH 3 amp 4 Each section contains a pair of RCA type input jacks an Input Voltage switch and an Input Sens rotary control CH 3 amp 4 Input Section Input Voltage Input Sens Input Voltage Input Sens 1 Q 1 O Low High Low High O O CH1 cH fahe edt CH3 CH4 Left Right Only 3 amp 4 Left Right CH 1 amp 2 Input Section The CH 1 amp 2 Input Section also contains an Input Mode switch to allow
16. you are using an aftermarket source unit with conventional preamp level outputs this is most likely the position that you will use The High position on each Input Voltage switch selects an input sensitivity range between 800mV and 8V This is useful for certain high output preamp level signals as well as speaker level output from source units and small amplifiers To use speaker level sources splice the speaker output wires of the source unit or small amplifier onto a pair of RCA plugs for each input pair or use the JL Audio ECS Speaker Wire to RCA adaptor XB CLRAIC2 SW EMPORTANT The output of the amplifier will decrease for a given input voltage when the Input Range switch is placed in the High position Conversely the output will be higher with the switch in the Low position While this may sound counter intuitive it is correct as described 3 Input Sensitivity Adjustment Located next to the Input Voltage switch in each input section is a rotary control labeled Input Sens Once the appropriate Input Voltage range has been selected this control can be used to match the source unit s output voltage to the input stage of each pair of amplifier channels for maximum clean output Rotating the control clockwise will result in higher sensitivity louder for a given input voltage Rotating the control counter clockwise will result in lower sensitivity quieter for a
17. 50 4v2 and a separate subwoofer amplifier A Real Left Center Right Channels and Subwoofer with Multi Channel Source Required a multi channel processor or source unit Dolby Digital Dolby ProLogic II dts etc with center channel output Input Connections the left front and right front source unit outputs are connected to the CH 1 amp 2 inputs of the 450 4v2 and the front center channel output of the source unit or processor is connected to the CH 3 amp 4 inputs of the 450 4v2 select 4ch on the Input Mode switch in the CH 1 amp 2 Input Section Use a Y adaptor like the JL Audio ECS model XB CLRAICY 1F2M sold separately to feed both RCA jacks on the amplifier from the single signal cable Most multi channel processors and source units are also equipped with a dedicated subwoofer output and subwoofer level control Connect this subwoofer output directly to the subwoofer amplifier s inputs The 450 4v2 s preamp outputs are not used Result True left center and right channels with multi channel material derived center channel with stereo material Rear surround channels are unused User adjustability of left center and right channels depends on source unit processor Subwoofer level is user adjustable IMPORTANT Set the subwoofer amplifier s Input Sens with the source unit s subwoofer level control set at 3 4 of full output Refer to the subwoofer amplifier owner
18. EEN EE N EEE 65 ee ee er EEE 67 E E A eens 69 Pora eo EENE ERAR 7A S EE EE EEN 74 4B EAE 77 ee re rere 80 EENE ENAA IE 82 AET E A TE ilo as 85 e E E EEE ETE 90 e crc E EEE 93 POE E E 97 EEE T E 02 PA EEE NEEE 07 PE AEE EEE 13 Pr EEEE AAAS EE 20 PIE A EET 27 PEEP 130 R 35 QU eoii t A Rew Maen aaGaa ER 43 DO A O AA ERA 53 DD MEE A E 71 See ES EET 82 E E E 201 E Y EE 200 srie 223 EE EIEEEI EEE 253 E EE ee eee 289 EE A AE 337 DO EESE ET E EE 404 I e NAOn waste 474 JEn a R 514 Full clockwise 542 APPENDIX B Input Sensitivity Level Setting APPENDIX A Input Sensitivity Level Setting JL Audio amplifiers utilizing the Regulated Intelligent Power Supply R I P S allow delivery of their rated power when connected to any load impedance from 1 5 4Q per channel and when connected to a charging system with any voltage from 11 14 5V This design is beneficial for many reasons One of these reasons is ease of setup Because each JL Audio amplifier will always deliver the same amount of power within its operational range of impedances and supply voltages the maximum unclipped output is very predictable This makes setting the gain structure via the input sensitivity controls very simple Following the directions below will allow the user to adjust the input sensitivity of the amplifier s simply and easily in just a few minutes using equipment which is commonly available in installation bays Necessary Equipment
19. H 1 amp 2 Input Section The source unit s dedicated subwoofer output is connected to the subwoofer amplifier inputs In this mode the 450 4v2 s preamp output is not used Result with this option the user has the ability to fade the front and rear HF channels relative to each other and also has the ability to control the absolute level of the subwoofer channel relative to the HF channels EMPORTANT Set the CH 1 amp 2 Input Sens with the source unit s subwoofer level control set at 3 4 of full output See Appendix B page 20 for details Crossover Setup for Bi Amplified System with one 450 4v2 and a separate subwoofer amplifier Once the input and preamp output sections have been configured appropriately go to the CH 1 amp 2 Filter Section Select x1 on the Freq Range switch HP high pass on the Filter Type switch and 12dB or 24dB on the Filter Mode Slope switch and an appropriate Filter Freq 80 90 Hz is a good starting point The Infrasonic Filter and Bass EQ features cannot be used in this mode Next turn your attention to the CH 3 amp 4 Input Section and select x1 on the Freq Range switch HP high pass on the Filter Type switch and 12dB or 24dB on the Filter Mode Slope switch and an appropriate Filter Freq again 80 90 Hz is a good starting point 16 JL Audio 450 4v2
20. OWNER S MANUAL 450 4ve four channel system amplifier Thank you for purchasing a JL Audio amplifier for your automotive sound system Your amplifier has been designed and manufactured to exacting standards in order to ensure years of musical enjoyment in your vehicle For maximum performance and extended warranty coverage we highly recommend that you have your new amplifier installed by an authorized JL Audio dealer Your authorized dealer has the training expertise and installation equipment to ensure optimum performance from this product Should you decide to install the amplifier yourself please take the time to read this manual thoroughly so as to familiarize yourself with its installation requirements and setup procedures If you have any questions regarding the instructions in this manual or any aspect of your amplifier s operation please contact your authorized JL Audio dealer for assistance If you need further assistance please call the JL Audio Technical Support Department at 954 443 1100 during business hours PROTECT YOUR HEARING We value you as a long term customer For that reason we urge you to practice restraint in the operation of this product so as not to damage your hearing and that of others in your vehicle Studies have shown that continuous exposure to high sound pressure levels can lead to permanent irreparable hearing loss This and all other high power amplifiers are capable of producing suc
21. Owner s Manual After proper adjustment of the 450 4v2 s CH 1 amp 2 and CH 3 amp 4 and the subwoofer amplifier s Input Range and Input Sens you can fine tune filter frequencies and slopes and attenuate either pair of channels to achieve proper balance For proper adjustment of the Input Sens controls of the 450 4v2 use the method shown in Appendix B page 22 For precise filter frequency information for the 450 4v2 refer to Appendix A page 22 Refer to the subwoofer amplifier owner s manual for proper adjustments Bi Amplified 3 1 System with one 450 4v2 in three channel mode and a separate subwoofer amplifier This configuration requires a separate subwoofer amplifier with a built in low pass filter All JL Audio subwoofer amplifiers have this feature The separate amplifier will drive the subwoofer system with low pass filtering select a filter frequency of 80 90 Hz to start The inputs of the subwoofer amplifier will be connected to the preamp outputs of the 450 4v2 or to the source unit or multi channel processor directly In this configuration CH 1 amp 2 of the 450 4v2 will drive front left and front right component speakers stereo 150W x 2 with high pass filtering CH 3 amp 4 will be bridged mono to drive a center front component speaker system 150W x 1 with high pass filtering All three channels will have equal power at 3 40 Input connection options for bi amplified 3 1 system with one 4
22. control fy iMPORTANT Set the subwoofer amplifier s Input Sens with the source unit s subwoofer level control set at 3 4 of full output Refer to the subwoofer amplifier owner s manual for proper adjustment 18 JL Audio 450 4v2 Owner s Manual Crossover setup for bi amplified 3 1 system with one 450 4v2 and a separate subwoofer amplifier Once the input and preamp output sections have been configured appropriately go to the CH 1 amp 2 Filter Section Select x1 on the Freq Range switch HP high pass on the Filter Type switch and 12dB or 24dB on the Filter Mode Slope switch and an appropriate Filter Freq 80 90 Hz is a good starting point The Infrasonic Filter and Bass EQ features cannot be used in this mode Next turn your attention to the CH 3 amp 4 Input Section and select x1 on the Freq Range switch HP high pass on the Filter Type switch and 12dB or 24dB on the Filter Mode Slope switch and an appropriate Filter Freq again 80 90 Hz is a good starting point After proper adjustment of the 450 4v2 s CH 1 amp 2 and CH 3 amp 4 and the subwoofer amplifier s Input Range and Input Sens you can fine tune filter frequencies and slopes and attenuate the center channel or the left and right channel pair with the Input Sens controls to achieve proper balance Fo
23. ction provides two basic bass processing tools for CH 1 amp 2 a 24 dB octave infrasonic filter at 30 Hz and a 6 dB boost circuit centered at 48 Hz Activation of either feature automatically sums the CH 1 amp 2 input signals to mono These features should only be used when driving subwoofer s from CH 1 amp 2 Its CH 1 amp 2 Bass Control CH1 BassEQ Infrasonic Filter Freq off On Off 30Hz xl Either 7 ums the h 60 i activated i Remote Bass Port Filter F 10 JL Audio 450 4v2 Owner s Manual 1 Infrasonic Filter The infrasonic filter is a 24 dB octave high pass filter with a fixed cutoff frequency of 30 Hz This filter is designed to conserve amplifier power and protect subwoofer systems without audibly degrading the sub bass output With ported enclosures the use of the infrasonic filter is highly recommended to protect the speaker s from excessive excursion below box tuning With sealed enclosures the use of the filter is less necessary but can still help protect the speaker system The infrasonic filter can be completely defeated by selecting the Off position on the Infrasonic Filter switch This bypasses all signal from flowing through the circuit 2 Bass EQ This switch allows the user to activate a 6 dB boost centered at 48 Hz 3 Remote Bass Port Allows you to connect an optional remote boost knob sold separately JL Audio Mode
24. dent misuse abuse product modification or neglect failure to follow installation instructions unauthorized repair attempts misrepresentations by the seller This warranty does not cover incidental or consequential damages and does not cover the cost of removing or reinstalling the unit s Cosmetic damage due to accident or normal wear and tear is not covered under warranty Warranty is void if the product s serial number has been removed or defaced Any applicable implied warranties are limited in duration to the period of the express warranty as provided herein beginning with the date of the original purchase at retail and no warranties whether express or implied shall apply to this product thereafter Some states do not allow limitations on implied warranties therefore these exclusions may not apply to you This warranty gives you specific legal rights and you may also have other rights which vary from state to state If you need service on your JL AUDIO product All warranty returns should be sent to JL AUDIO s Amplifier Service Facility freight prepaid through an authorized JL AUDIO dealer and must be accompanied by proof of purchase a copy of the original sales receipt Direct returns from consumers or non authorized dealers will be refused unless specifically authorized by JL AUDIO with a valid return authorization number Warranty expiration on products returned without proof of purchase will be determined from the manufacturin
25. e depending on the overall current demands of all the amplifiers in the system This 2 AWG or 1 0 AWG power wire should terminate into a distribution block mounted as close to the amplifiers as possible and should connect to the 450 4v2 with 4 AWG power wire Note Smaller AWG numbers mean bigger wire and vice versa 1 0 AWG is the largest 2 AWG is smaller then 4 AWG then 8 AWG etc To connect the power wires to the amplifier first back out the set screw on the top of the amplifier using the supplied 2 5 mm hex wrench Strip 1 2 inch 12 mm of insulation from the end of each wire and insert the bare wire into the receptacle on the front panel of the amplifier seating it firmly so that no bare wire is exposed While holding the wire in place tighten the set screw firmly taking care not to strip the head of the screw The ground connection should be made using the same gauge wire as the power connection 4 AWG and should be kept as short as possible while accessing a solid piece of sheet metal in the vehicle The surface of the sheet metal should be sanded at the contact point to create a clean metal to metal connection between the chassis and the termination of the ground wire For optimal grounding we recommend the use of a JL Audio ECS master ground lug XB MGLU Alternatively a sheet metal screw or bolt can be used with a star washer Any wires run through metal barriers such as firewalls must be protected wit
26. e HF high frequency channels as well as the low pass cutoff frequency and slope for the MF channels bandpass filter Select x1 on the Freq Range switch if your desired MF to HF crossover frequency is below 500 Hz Select x10 on the Freq Range switch if your desired MF to HF crossover frequency is above 500 Hz Select HP high pass on the Filter Type switch and 12dB or 24dB on the Filter Mode Slope switch and an appropriate Filter Freq After proper adjustment of the 450 4v2 s CH 1 amp 2 and CH 3 amp 4 and the subwoofer amplifier s Input Range and Input Sens you can fine tune filter frequencies and slopes and attenuate the LF MF and HF channel pair or with the Input Sens controls to achieve proper balance For proper adjustment of the Input Sens controls of the 450 4v2 use the method shown in Appendix B page 22 For precise filter frequency information for the 450 4v2 refer to Appendix A page 22 Refer to the subwoofer amplifier owner s manual for proper adjustments 20 JL Audio 450 4v2 Owner s Manual 21 APPENDIX A Precise Frequency Selection Chart FILTER FREQ CH 1 amp 2 CH 3 amp 4 Detent Panel Actual Number Marking Freq Full counter clockwise 58 E E E ere EE 58 OZ es tasiennls ae ABO AE 58 US EE EEN EE 58 07 TEE E PE 58 NEE TEA E 59 O EEE A EE 60 TA EEEE EE 61 OB eedaes dae 00 rogoi 63 UD
27. el pair will optimize output between 3 80 The operation of the R I P S circuitry is entirely automatic and adjusts itself every time the amplifier is turned on according to the lowest impedance present at the speaker load There are no user controls to configure The system operates through multiple stages of impedance optimization choosing the stage most appropriate to the actual impedance of the speakers you connect to it ction CH 1 amp 2 Speaker Outputs CH GEE utput Bridged 300W x 1 3 80 WZ 5 EMPORTANT If you connect a load higher than 40 nominal per channel in stereo mode or 80 in bridged mode power will drop by half with every doubling of impedance above 40 stereo 80 mono If you connect a load lower than 1 50 nominal per channel in stereo mode or 30 in bridged mode the amplifier protection circuitry activates a safe mode which reduces amplifier power to protect the circuitry from failure the yellow Low Q LED lights to indicate that this has happened See page 13 for details Ey iMPORTANT Speaker loads below 1 50 nominal per channel in stereo or 3Q nominal in bridged mode are not recommended and may cause the amplifier output to distort excessively BRIDGING CONSIDERATIONS Bridging is the practice of combining the output of two amplifier channels to drive a single load When bridged each channel produces signals of equal magnitude but opposite polarity
28. fading of the rear channels without affecting the subwoofer level 2 3 amp 4 The preamp output delivers the same signal that is connected to the 450 4v2 s CH 3 amp 4 Inputs This mode is useful for feeding a subwoofer amplifier when the 450 4v2 is being used to drive front and rear speaker systems This preamp output mode will track the signal level of CH 3 amp 4 allowing fading of the front channels without affecting the subwoofer level 3 ALL This mode delivers a sum of the signals being fed to the CH 1 amp 2 Input Section and CH 3 amp 4 Input Section of the amplifier The Preamp Output signal is not affected by the LF Boost or Infrasonic Filter processing selected for the amplifier or by any crossover filter selected if the input signal is full range the preamp output will be full range When the 450 4v2 is being used to drive front and rear speaker systems this preamp output mode will deliver a summed front rear signal to the subwoofer amplifier while permitting fading of the front and rear speaker systems from the source unit Note The signal level of the Preamp Output is always low level regardless of the voltage applied to this amplifier s inputs and the setting chosen on this amplifier s Input Range switch A JL Audio amplifier receiving signal from this preamp output should have its Input Range switch set to Low CH 1 amp 2 Bass Control This se
29. from the front of the vehicle B Fade Subwoofer Level vs HF Level Required a source unit or processor with front and rear pairs of outputs Input Connections the first stereo pair of source unit outputs is connected to the CH 1 amp 2 inputs of the 450 4v2 The second stereo pair of source unit outputs is connected to the CH 3 amp 4 inputs select 4ch on the Input Mode switch in the CH 1 amp 2 Input Section Result in this mode the user has the ability to fade or control the level of the LF channels relative to the HF channels via the source unit s fader control without exceeding the maximum clean output level set by each z amplifier section s Input Sens controls C Subwoofer Level Control Only Required a source unit or processor with left right and subwoofer outputs Input Connections the main stereo pair of source unit outputs is connected to the CH 3 amp 4 inputs of the 450 4v2 The source unit s dedicated subwoofer output is connected to the CH 1 amp 2 inputs select 4ch on the Input Mode switch in the CH 1 amp 2 Input Section Result in this mode the user has the ability to control the absolute level of the LF channels relative to the HF channels Ey IMPORTANT Set the CH 1 amp 2 Input Sens with the source unit s subwoofer level control set at 3 4 of full output See Appendix B page 22 for details Crossover Setup for Bi Amplified S
30. g 9 pg 7 pg 9 pg 7 pg 11 12VDC Ground an Preamp Output Section CH1 amp 2 Speaker Outputs CH 1 amp 2 Bass Control CH 1 amp 2 Filter Section CH 1 amp 2 Input Section CH3 amp 4Filter Section CH3 amp 4 Input Section CH3 amp 4 Spegker Outputs JL AUDIO 450 4ve Four Channel System Amplifier Signal From OO Left Output Right Output Left and Right Preamp Output Jacks pg 10 2 JL Audio 450 4v2 Owner s Manual Bridged 300W x 1 3 80 Bass EQ Infrasonic Filter Freq Range Filter Mode Slope Input Voltage Input Sens mg mE ERE E off On Remote Bass Port Jack for Remote Bass Control Knob pg 11 Off 30Hz x1 x10 Off 12dB 24dB Low High 95 75 130 Filter Type yy Input Mode E E 50 500 LP BP HP J 2ch 4ch CH1 CH2 Left Right Filter Freq Hz Selects CH 1 amp 2 CH 1 amp 2 Selects HP or LP Cutoff Left and Right 2ch 4ch Frequency or HP Cutoff Input Jacks Input Mode of Bandpass Filter pg 7 pg 7 pg 8 Freq Range High PassFilter Input Voltage Input Sens E x1 x10 Off 12dB 24dB Low High 95 130 Alsosets low pass oo 0 GEA Bandpass Left Right iter H 500 lifselected 75W 15 40 75W i F F j E CH3 CH4 HP Filter Freq Hz EA right Bridged 150W x 1 3 80 Selects CH 3 amp 4 CH 3 amp 4 High Pass Cutoff Left and Right Frequency and Low Pass Input Jacks Cutoff for CH 1 a
31. g date code Coverage may be invalidated as this date is previous to purchase date Non defective items received will be returned freight collect Customer is responsible for shipping charges and insurance in sending the product to JL AUDIO Freight damage on returns is not covered under warranty For Service Information in the U S A please call JL Audio Customer Service 954 443 1100 9 00 AM 5 30 PM Eastern Time Zone JL Audio Inc 10369 North Commerce Pkwy Miramar FL 33025 do not send product for repair to this address International Warranties Products purchased outside the United States of America are covered only by that country s distributor and not by JL Audio Inc Absolute Symmetry Class A B Amplifier Circuit is covered by U S Patent 6 294 959 and is pending in the countries listed below Austria Belgium Brazil Canada China France Germany Indonesia Italy Japan Republic of Korea Mexico Netherlands Norway Russian Federation Singapore Sweden Switzerland United Kingdom and all other PCT countries 450 4v2MAN CH 03 2007
32. given input voltage To properly set each pair of amplifier channels for maximum clean output please refer to Appendix B page 22 in this manual After using this procedure you can then adjust the relative level of each channel pair by adjusting the input sensitivity downward on either or both channel pairs if they require attenuation to achieve the desired system balance Do not increase the Input Sens setting for any amplifier in the system beyond the maximum level established during the procedure outlined in Appendix B page 22 Doing so will result in audible distortion and possible speaker damage Be aware that both Input Sens adjustments will have to be made regardless of how many input cables are feeding the amplifier These controls will allow you to set the appropriate relative levels for CH 1 amp 2 relative to CH 3 amp 4 and other amplifier channels in the system CROSSOVER CONTROLS Crossovers are groups of individual electronic filters which allow only certain frequency ranges to pass through them by attenuating frequencies outside the selected range These filters allow the user to specify what frequency range will be sent out of each channel section of the amplifier This in turn allows each speaker system to only reproduce a range of frequencies it is well suited for resulting in reduced distortion and improved fidelity CH 1 amp 2 Filter Section trol CH 1 amp 2 Filter Sectio
33. h a high quality insulating grommet to prevent damage to the insulation of the wire Failure to do so may result in a dangerous short circuit IMPORTANT Many vehicles employ small 10 AWG 6 AWG wire to ground the battery to the vehicle chassis and to connect the alternator s positive connection to the battery To prevent voltage drops these wires should be upgraded to 4 AWG when installing amplifier systems with main fuse ratings above 60A Fuse Requirements It is absolutely vital that the main power wire s to the amplifier s in the system be fused within 18 inches 45 cm of the positive battery post connection The fuse value at each power wire should be high enough for all of the equipment being run from that power wire If only the 450 4v2 is being run from that power wire we recommend a 60A fuse be used AGU big glass fuse or MaxiFuse big plastic body fuse types are recommended No fuse is required or recommended directly before the amplifier power connection If one is desired we recommend the use of a 60A AGU fuse or MaxiFuse type 6 JL Audio 450 4v2 Owner s Manual TURN ON LEAD The 450 4v2 uses a conventional 12V remote turn on lead typically controlled by the source unit s remote turn on output The amplifier will turn on when 12V is present at its Remote input and turn off when 12V is switched off If a source unit does not have a dedicated remote turn on output the amplifier
34. h high sound pressure levels when connected to a speaker system Please limit your continuous exposure to high volume levels While driving operate your audio system in a manner that still allows you to hear necessary noises to operate your vehicle safely horns sirens etc SERIAL NUMBER In the event that your amplifier requires service or is ever stolen you will need to have a record of the product s serial number Please take the time to enter that number in the space provided below The serial number can be found on the bottom panel of the amplifier and on the amplifier packaging Serial Number INSTALLATION APPLICATIONS This amplifier is designed for operation in vehicles with 12V negative ground electrical systems Use of this product in vehicles with positive ground and or voltages other than 12V may result in damage to the product and will void the warranty This product is not certified or approved for use in aircraft Do not attempt to bridge the outputs of this amplifier with the outputs of a second amplifier including an identical one PLANNING YOUR INSTALLATION It is important that you take the time to read this manual and that you plan out your installation carefully The following are some considerations that you must take into account when planning your installation Cooling Efficiency Considerations Your JL Audio amplifier employs an advanced type of heat management called RealSink
35. ion during installation This step is not optional 2 Run power wire minimum 4 AWG from the battery location to the amplifier mounting location taking care to route it in such a way that it will not be damaged and will not interfere with vehicle operation Use 2 AWG or 1 0 AWG power wire if additional amplifiers are being installed with the 450 4v2 3 Connect power wire to the positive battery post Fuse the wire with an appropriate fuse block and connectors within 18 inches 45 cm wire length of the positive battery post This fuse is essential to protect the vehicle Do not install the fuse until the power wire has been connected to the amplifier 4 Run signal cables RCA cables and remote turn on wire from the source unit to the amplifier mounting location 5 Run speaker wire from the speaker systems to the amplifier mounting location 6 Find a good solid metal grounding point close to the amplifier and connect the negative power wire to it using appropriate hardware Use minimum 4 AWG power wire no longer than 36 inches 90 cm from the amplifier to the ground connection point In some vehicles it may be necessary to upgrade the battery ground wire See page 6 for important notice 7 Securely mount the amplifier using appropriate hardware 8 Connect the positive and negative power wires to the amplifier A fuse near the amplifier is not necessary 9 Connect the remote turn on wire to the amp
36. ir of source unit outputs is connected to the CH 3 amp 4 inputs Connect the subwoofer amplifier inputs to the preamp outputs of the 450 4v2 Select ALL on the Signal From switch in the Preamp Output Section Result with this option the user has the ability to adjust the relative level of the Summed Center Channel input relative to the Left and Right channel pair via the source unit s fader control Subwoofer is non fading D Fade Between Summed Center Channel Level and Left Right Level with Separate Subwoofer Level Control Required a source unit or processor with front and rear pairs of stereo outputs plus a dedicated subwoofer output Input Connections one pair of stereo source unit outputs is connected to the CH 1 amp 2 inputs of the 450 4v2 select 4ch on the Input Mode switch in the CH 1 amp 2 Input Section A second pair of source unit outputs is connected to the CH 3 amp 4 inputs The source unit s dedicated subwoofer output is connected to the subwoofer amplifier s inputs In this mode the 450 4v2 s preamp output is not used Result with this option the user has the ability to fade between the Summed Center Channel level and the Left and Right channel levels via the source unit s fader control and also has the ability to control the absolute level of the subwoofer channel relative to the three HF channels with the source unit s subwoofer level
37. l RBC 1 that can be mounted in the front of the vehicle With the RBC 1 connected the boost is no longer limited to 0 or 6 dB allowing a range of 0 15 dB of boost to be selected EMPORTANT The Bass EQ and Infrasonic Filter features will only operate when the CH 1 amp 2 filter is activated and in low pass mode If you are using an external active crossover and would like to use the Bass EQ and Infrasonic Filter features set the Filter Mode Slope switch on 12dB and rotate the frequency selection knob fully clockwise to the 500 Hz position This will activate the bass controls without significantly affecting the crossover point selected by the external active crossover SPEAKER OUTPUTS The 450 4v2 employs JL Audio s exclusive Regulated Intelligent Power Supply R I P S design The operation of the R I P S system is independent for each pair of channels This sophisticated power supply allows the amplifier to produce its optimum power 150 watts x 2 for channels 1 amp 2 and 75 watts x 2 for channels 3 amp 4 over a wide range of speaker impedances Unlike conventional amplifiers that require a specific impedance to produce optimum power the R I P S equipped 450 4v2 gives you the freedom to use a variety of speaker configurations that achieve final nominal impedances between 1 5 40 per channel in stereo without sacrificing power output or sound quality When bridged each chann
38. lifier 10 Connect the RCA input cables to the amplifier 11 Connect the speaker wires to the amplifier 12 Carefully review the amplifier s control settings to make sure that they are set according to the needs of the system 13 Install power wire fuse 60A for a single 450 4v2 and reconnect the negative battery post terminal 14 Turn on the source unit at a low level to double check that the amplifier is configured correctly Resist the temptation to crank it up until you have verified the control settings 15 Make necessary adjustments to the input sensitivity controls to obtain the right overall output and the desired balance in the system See Appendix B page 22 for the recommended input sensitivity setting method 16 Enjoy the fruits of your labor with your favorite music 4 JL Audio 450 4v2 Owner s Manual POWER CONNECTIONS Before installing the amplifier disconnect the negative ground wire from the vehicle s battery This will prevent accidental damage to the system the vehicle and your body during installation 12VDC Ground Remote JL AUDIO 450 4ve Four Channel System Amplifier The 450 4v2 s 12 VDC and Ground connections are designed to accept 4 AWG power wire 4 AWG is the only recommended power wire size for this amplifier If you are installing the 450 4v2 with other amplifiers and wish to use a single main power wire use 2 AWG or 1 0 AWG main power wir
39. mp 2 Bandpass pg 7 Filter pg 10 PRODUCT DESCRIPTION The JL Audio 450 4v2 is a four channel system amplifier utilizing patented Absolute Symmetry Class AB technology for all channels All channels benefit from JL Audio s exclusive R I P S power supply design which optimizes the output of each channel pair for any impedance between 1 5 and 4 ohms per channel The staggered power distribution of the 1 amp 2 and 3 amp 4 channel pairs 150W x 2 for CH 1 amp 2 and 75 x 2 for CH 3 amp 4 allows for a wide variety of application options The 450 4v2 can be operated in the following modes 1 Asa full system amplifier in bi amp mode with CH 1 amp 2 driving subwoofers in low pass mode 150W x 1 or 300W x 1 and CH 3 amp 4 driving main speakers in high pass mode 75W x 2 2 As a high power four channel satellite amplifier in a bi amplified system delivering high passed signals to front and rear speaker systems In this mode we recommend that CH 1 amp 2 drive the front speaker systems and CH 3 amp 4 drive the rear speaker systems Preamp outputs permit connection of a separate amplifier to drive the subwoofer system 3 As a high power four channel satellite amplifier in a tri amplified system delivering band passed signals through CH 1 amp 2 to mid bass speakers and high passed signals through CH 3 amp 4 to mid range tweeter speaker systems Preamp outputs permit connection of a separate amplifier to drive the subwoofer s
40. mplifier has a built in low pass filter All JL Audio subwoofer amplifiers have this feature In this configuration CH 1 amp 2 of the 450 4v2 will drive front component speakers stereo 150W x 2 with high pass filtering CH 3 amp 4 will drive rear component speakers in stereo 75W x 2 with high pass filtering The separate amplifier will drive the subwoofer system with low pass filtering select a filter frequency of 80 90 Hz to start The inputs of the subwoofer amplifier may or may not be connected to the preamp outputs of the 450 4v2 depending on which connection option you choose Input connection options for a bi amplifier system with one 450 4v2 and a separate subwoofer amplifier are as follows A No User Adjustability Required a basic source unit or processor with left and right stereo outputs Input Connections a single pair of stereo source unit outputs is connected to the CH 1 amp 2 inputs of the 450 4v2 select 2ch on the Input Mode switch in the CH 1 amp 2 Input Section Connect the subwoofer amplifier inputs to the preamp outputs of the 450 4v2 Select 1 amp 2 on the Signal From switch in the Preamp Output Section Result the relative level of the LF and front and rear HF channels will be fixed by the 450 4v2 s Input Sens settings and will not be user adjustable from the front of the vehicle B Fade Subwoofer Level vs HF Level Required a source unit or process
41. n Filter Freq Range FilterMode Slope Input iHz x1 x10 Off 12dB 24dB Low 1 7 75 L a30 Filter Type R in ll C to hen 50 500 LP BP HP P cr Filter Freq Hz te 1 Filter Type Control Located in the CH 1 amp 2 Filter Section this switch allows you to configure the CH 1 amp 2 filter into one of three filter types LP Low Pass Configures the CH 1 amp 2 filter to attenuate frequencies above the selected filter frequency Useful for connection of subwoofer s to CH 1 amp 2 in a bi amplified system BP Bandpass Configures the filter to attenuate frequencies above the selected filter frequency and below the frequency selected in the CH 3 amp 4 High Pass Filter This creates a true bandpass filter well suited for driving mid bass or mid range speakers in a tri amplified system HP High Pass Configures the CH 1 amp 2 filter to attenuate frequencies below the selected filter frequency Useful for connection of component speakers to CH 1 amp 2 in a bi amplified system 2 Filter Mode Slope Control This switch allows you to defeat the CH 1 amp 2 filter or select from two filter slopes Off Defeats the filter for CH 1 amp 2 completely allowing the full range of frequencies present at the inputs to feed that pair of channels This is useful for systems utilizing outboard crossovers or requiring full range reproduction from that pair of channels 12dB
42. n when voltage climbs back above 10 volts This may happen in a rapid cycle when bass heavy program material causes a weak charging system to dip below 10 volts momentarily If this is happening in your system have your charging system inspected to make sure it is working properly For information on troubleshooting this amplifier refer to Appendix C page 24 SERVICING YOUR JL AUDIO AMPLIFIER If your amplifier fails or malfunctions please return it to your authorized JL Audio dealer so that it may be sent in to JL Audio for service There are no user serviceable parts or fuses inside the amplifier The unique nature of the circuitry in the JL Audio amplifiers requires specifically trained service personnel Do not attempt to service the amplifier yourself or through unauthorized repair facilities This will not only void the warranty but may result in the creation of more problems within the amplifier If you have any questions about the installation or setup of the amplifier not covered in this manual please contact your dealer or technical support JL Audio Technical Support 954 443 1100 9 00 AM 5 30 PM Eastern Time Zone Monday Friday SYSTEM CONFIGURATIONS The 450 4v2 is a very flexible amplifier well suited for a multitude of system configurations In this section the most likely configurations are explained in detail Once you have selected your desired configuration you can use the amplifier panel drawi
43. ngs on the bottom of the following pages to mark the required switch positions for easy reference BI AMPLIFIED SYSTEMS Bi amplified systems are defined as systems in which separate amplifier channels drive low frequency LF and high frequency HF speakers and are separately filtered to send appropriate frequency ranges to each speaker system The most common application of bi amplification in mobile audio is to drive a subwoofer system from one or more amplifiers or channels and component speakers from separate amplifiers or channels The 450 4v2 can be configured to drive a bi amplified system by itself or with a separate subwoofer amplifier Bi Amplified System with one 450 4v2 In this configuration CH 1 amp 2 of the 450 4v2 will drive subwoofers stereo 150W x 2 or bridged 300W x 1 with low pass filtering CH 3 amp 4 will drive component speakers in stereo 75W x 2 with high pass filtering Input connection options for a bi amplified system with one 450 42 are as follows A No User Adjustability Required a basic source unit or processor with left and right stereo outputs Input Connections a single pair of stereo source unit outputs connected to the CH 1 amp 2 inputs of the 450 4v2 select 2ch on the Input Mode switch in the CH 1 amp 2 Input Section Result the relative level of the LF and HF channels will be fixed by the 450 4v2 s Input Sens settings and will not be user adjustable
44. or with front and rear pairs of stereo outputs Input Connections one stereo pair of source unit outputs is connected to the CH 1 amp 2 inputs of the 450 4v2 select 2ch on the Input Mode switch in the CH 1 amp 2 Input Section The second stereo pair of source unit outputs is connected to the subwoofer amplifier inputs In this mode the 450 4v2 s preamp output is not used Result with this option the user has the ability to fade the level of the subwoofer amplifier s input relative to the HF channels but cannot control front to rear fading of the HF channels The relative level of the front and rear HF channels will be fixed by the 450 4v2 s Input Sens settings and will not be user adjustable from the front of the vehicle 14 JL Audio 450 4v2 Owner s Manual C Fade HF Front to Rear with Non Fading_ Subwoofer Level Required a source unit or processor with front and rear pairs of stereo outputs Input Connections one stereo pair of source unit outputs is connected to the CH 1 amp 2 inputs of the 450 4v2 select 4ch on the Input Mode switch in the CH 1 amp 2 Input Section The second stereo pair of source unit outputs is connected to the CH 3 amp 4 inputs of the 450 4v2 Connect the subwoofer amplifier inputs to the preamp outputs of the 450 4v2 Select ALL on the Signal From switch in the Preamp Output Section Result with this option the u
45. ormally 2 Thermal Red lights to indicate that the amplifier has exceeded its safe operating temperature putting the amplifier into a self protection mode which reduces the power output of the amplifier The red light will shut off and the amplifier will return to normal full power operating mode if the heat sink temperature drops back to a safe level 3 Low Q Amber lights to indicate that the impedance of the speaker load connected to the amplifier is lower than the optimum load impedance range for the amplifier When this light is on a protection circuit engages and reduces the power output of CH 1 amp 2 or CH 3 amp 4 depending on which channel is experiencing the problem The amber indicator will also light when a short circuit is detected in the speaker wiring this can be a short between the positive and negative speaker wires or between either speaker wire and the vehicle chassis This can be used to diagnose a short circuit by only connecting one of the amplifier sections at a time CH 1 amp 2 and CH 3 amp 4 The amber LED will light when you connect the section that is experiencing the problem and turn the volume up There is only one condition that will shut down an undamaged 450 4v2 completely If battery voltage drops below 10 volts the entire amplifier will shut itself off The green Power indicator on the top of the amplifier will turn off when this occurs The amplifier will turn back o
46. pendix A page 22 of this manual CH 3 amp 4 Filter Section CH3 amp 4 Filter Section CH Freq Range High Pass Filter Inpu m j m E x1 x10 Off 12dB 24dB Lov 95 Mode 75 130 Also sets 7 low pass 4ch 1 amp 2 3 amp 4 1 High Pass Filter Control This switch allows you to defeat the CH 3 amp 4 filter or select from two different filter slopes Off Defeats the filter for CH 3 amp 4 completely allowing the full range of frequencies present at the inputs to feed that pair of channels This is useful for systems utilizing outboard crossovers or requiring full range reproduction from these channels 12dB Configures the high pass filter for CH 3 amp 4 to attenuate frequencies below the selected filter frequency at a rate of 12 dB per octave Butterworth alignment 24dB Configures the high pass filter for CH 3 amp 4 to attenuate frequencies below the selected filter frequency at a rate of 24 dB per octave Linkwitz Riley alignment Depending on the speaker system and the vehicle different filter slopes may be required to produce a smooth transition between the speakers in the system Experiment to find the slope which best matches the acoustic requirements of your system The sharper 24dB setting will do a better job of protecting small speakers with limited power handling The shallower 12dB octave setting allows the rear speakers to reproduce more
47. put design Power Supply Independent pulse width modulation regulated switching power supply with multistage impedance optimizing circuitry Rated Power Stereo 150W RMS x 2 1 5 40 11V 14 5V Rated Power Bridged 300W RMS x 1 3 80 11V 14 5V THD at Rated Power lt 0 03 40 per channel 20 Hz 20 kHz Signal to Noise Ratio gt 108 5 dB referred to rated power A weighted 20 Hz 20 kHz noise bandwidth Frequency Response 5 Hz 30 kHz 0 1dB Damping Factor gt 200 40 per ch 50 Hz gt 100 20 per ch 50 Hz Slew Rate 25V us CH 1 amp 2 Filter State variable 12 dB octave Butterworth or 24 dB octave Linkwitz Riley Low Pass or High Pass with continuously variable cutoff frequency from 50 500 Hz switchable to a range of 500 5000 Hz via x10 switch Can also be cascaded from Channel 3 amp 4 filter s cutoff frequency to operate as a bandpass filter for tri amp configurations Defeatable LF Boost Single band fixed frequency 48 Hz fixed Q 6 dB boost Defeatable Port for optional remote bass control to provide variable boost control from 0 to 15 dB Infrasonic Filter 24 dB octave 30 Hz defeatable Channels 3 amp 4 Amplifier Topology Class A B with patented Absolute Symmetry dual N Channel MOSFET output design Power Supply Independent pulse width modulation regulated switching power supply with multistage impedance optimizing circuitry Rated Power Stereo 75W RMS x
48. r proper adjustment of the Input Sens controls of the 450 4v2 use the method shown in Appendix B page 22 For precise filter frequency information for the 450 4v2 refer to Appendix A page 22 Refer to the subwoofer amplifier owner s manual for proper adjustments Bi Amplified 5 1 System with Multi Channel Source one 450 4v2 in three channel mode a JL Audio 300 2 amplifier driving rear surround speakers and a separate subwoofer amplifier JL Audio 500 1v2 or 1000 1v2 recommended This configuration is identical to the 3 1 system configuration with Input Option A except for the addition of a JL Audio 300 2v2 two channel amplifier to drive rear surround speakers effectively creating a true 5 1 multi channel system with left front center front right front left rear and left right channels The 300 2v2 in two channel stereo mode is perfectly matched to the 450 4v2 in three channel Left Center Right mode The system will deliver 150 W x 5 to power the component speaker systems plus the output of an additional amplifier to the subwoofer system To add this capability connect the 300 2v2 s inputs to the rear surround outputs of a multi channel processor or source unit and set the 300 2v2 s Amp Filter in HP mode with a 12dB or 24dB filter slope TRI AMPLIFIED SYSTEMS Tri amplified systems are defined as systems in which separate amplifier channels drive low frequency LF mid frequency
49. ser has the ability to fade the HF signals from front to rear without fading the signal to the subwoofer amplifier D Subwoofer Level Control Only Required a source unit or processor with left right and dedicated subwoofer outputs Input Connections The main stereo pair of source unit outputs is connected to the CH 1 amp 2 inputs of the 450 4v2 select 2ch on the Input Mode switch in the CH 1 amp 2 Input Section The source unit s dedicated subwoofer output is connected to the subwoofer amplifier inputs In this mode the 450 4v2 s preamp output is not used Result with this option the user has the ability to control the absolute level of the subwoofer channel relative to the HF channels but cannot fade the front and rear HF channels relative to each other EMPORTANT Set the CH 1 amp 2 Input Sens with the source unit s subwoofer level control set at 3 4 of full output See Appendix B page 20 for details E Front to Rear HF Fading and Subwoofer Level Control Required a source unit or processor with front and rear pairs of stereo outputs plus a dedicated subwoofer output Input Connections one stereo pair front typically of source unit outputs is connected to the CH 1 amp 2 inputs of the 450 4v2 The second stereo pair of source unit outputs rear typically is connected to the CH 3 amp 4 inputs of the 450 4v2 select 4ch on the Input Mode switch in the C
50. speakers before proceeding Play a track with an appropriate sine wave within the frequency range to be amplified by each set of channels at 3 4 source unit volume 7 Connect the AC voltmeter to the CH 1 amp 2 Speaker Outputs or CH 3 amp 4 Speaker Outputs connectors of the amplifier If the channel pair is operating in stereo it is only necessary to measure one channel If bridged make sure you test the voltage at the correct connectors L and R CHANNELS 1 amp 2 8 Increase the Input Sens control until the target voltage is delivered for that set of channels If excessive voltage is read on either set of channels with the control at minimum full counterclockwise switch the appropriate Input Voltage switch to High and re adjust 9 Once you have adjusted each set of channels to its maximum unclipped output level reconnect the speaker s The Input Sens controls can now be adjusted downward if either or both sets of channels requires attenuation to achieve the desired system balance IMPORTANT Do not increase any Input Sens setting in the system beyond the maximum level established during this procedure Doing so will result in audible distortion and possible speaker damage It will be necessary to re adjust the Input Sens for the affected channels if any equalizer boost is activated after setting the Input Sens with this procedure This applies to any EQ
51. tput of the signal cables Check the output of the amplifier Using the procedure explained in the previous check item after plugging the input cables back into the amplifier test for output at the speaker outputs of the amplifier Unless you enjoy test tones at high levels it is a good idea to remove the speaker wires from the amplifier while doing this Turn the volume up approximately half way 5V or more should be measured at the speaker outputs This output level can vary greatly between amplifiers but it should not be in the millivolt range with the source unit at half volume If you are reading sufficient voltage check your speaker connections as explained below Check to ensure that the speaker wires are making a good connection with the metal inside the terminal block The speaker wire connectors are designed to accept up to 8 AWG wire Make sure to strip the wire to allow for a sufficient connection with the metal inside the terminal block 25 26 JL Audio 450 4v2 Owner s Manual APPENDIX D 450 4v2 Specifications General Specifications Recommended Fuse Value 60A Recommended Fuse Type AFS AGU or MaxiFuse Input Sections No of Inputs Two Stereo Pairs CH 1 amp 2 CH 3 amp 4 Input Type Differential balanced with RCA jack inputs Input Range Switchable from 200mvV 2V RMS to 800mV 8V RMS Channels 1 amp 2 Amplifier Topology Class A B with patented Absolute Symmetry dual N Channel MOSFET out
52. ur voltage source and grounding point The power supply of the 450 4v2 will operate with charging system voltages down to 10V Shutdown problems at higher volume levels can occur when the charging system voltage drops below 10V These dips can be of very short duration making them extremely difficult to detect with a common DC voltmeter To ensure proper voltage inspect all wiring and termination points It may also be necessary to upgrade the ground wire connecting the battery to the vehicle s chassis and the power wire connecting the alternator to the battery Many vehicles employ small 10 AWG 6 AWG wire to ground the battery to the vehicle s chassis and to connect the alternator to the battery To prevent voltage drops these wires should be upgraded to 4 AWG when installing amplifier systems with main fuse ratings above 60A Grounding problems are the leading cause of misdiagnosed amplifier failures My amplifier turns on but there is no output Check the input signal using an AC voltmeter to measure the voltage from the source unit while an appropriate test tone is played through the source unit disconnect the input cables from the amplifier prior to this test The frequency used should be in the range that is to be amplified by the amplifier example 50 Hz for a sub bass application or 1 kHz for a full range high pass application A steady sufficient voltage between 200mV and 8 0 volts should be present at the ou
53. uts of the 450 4v2 select 2ch on the Input Mode switch in the CH 1 amp 2 Input Section and the source unit s dedicated subwoofer output is connected to the subwoofer amplifier inputs In this mode the 450 4v2 s preamp output is not used Result the user has the ability to control the absolute level of the subwoofer channel relative to the MF and HF channels EMPORTANT Set the subwoofer amplifier s Input Sens with the source unit s subwoofer level control set at 3 4 of full output Refer to the subwoofer amplifier owner s manual for proper adjustment Crossover setup for tri amplified 3 1 system with one 450 4v2 and a separate subwoofer amplifier Once the input and preamp output sections have been configured appropriately go to the CH 1 amp 2 Filter Section of the 450 4v2 These settings will determine the high pass cutoff and slope of the bandpass filtering applied to the MF mid frequency channels Select x1 on the Freq Range switch BP bandpass on the Filter Type switch and 12dB or 24dB on the Filter Mode Slope switch and an appropriate Filter Freq 80 90 Hz is a good starting point The Infrasonic Filter and Bass EQ features cannot be used in this mode Next turn your attention to the CH 3 amp 4 Input Section These settings will determine the high pass cutoff and slope of the high pass filtering applied to th
54. ystem 4 As a high power three channel satellite amplifier delivering 150W x 3 at 40 in high pass mode to left center and right speaker systems This requires bridging the outputs of CH 3 amp 4 to create an equal power third channel to complement CH 1 amp 2 Preamp outputs permit connection of a separate amplifier to drive the subwoofer system The 450 4v2 s flexible input and crossover sections permit operation with a wide variety of source units and system configurations The 450 4v2 can operate with a single pair of stereo inputs or with separate inputs for CH 1 amp 2 and CH 3 amp 4 if the source unit is equipped with front and rear outputs The 450 4v2 s preamp output can send pass through signals from the CH 1 amp 2 inputs only or the CH 3 amp 4 inputs only or it can sum all four input channels to feed a subwoofer amplifier This latter mode allows for non fading sub bass with front to rear satellite fading As we said it s very flexible TYPICAL INSTALLATION SEQUENCE The following represents the sequence for a typical amplifier installation using an aftermarket source unit or OEM Interface processor like the CleanSweep CL441dsp Additional steps and different procedures may be required in some applications If you have any questions please contact your authorized JL Audio dealer for assistance 1 Disconnect the negative battery post connection and secure the disconnected cable to prevent accidental re connect
55. ystem with one 450 4v2 Once the input sections have been configured appropriately go to the CH 1 amp 2 Filter Section Select x1 on the Freq Range switch LP low pass on the Filter Type switch and 12dB or 24dB on the Filter Mode Slope switch and an appropriate Filter Freq 80 90 Hz is a good starting point You may also choose to activate the Infrasonic Filter and or Bass EQ features in the CH 1 amp 2 Bass Control section Please keep in mind that activation of the Bass EQ may require lowering the CH 1 amp 2 Input Sens to maintain clean maximum output Next turn your attention to the CH 3 amp 4 Input Section and select x1 on the Freq Range switch HP high pass on the Filter Type switch and 12dB or 24dB on the Filter Mode Slope switch and an appropriate Filter Freq again 80 90 Hz is a good starting point After proper adjustment of the CH 1 amp 2 and CH 3 amp 4 Input Range and Input Sens controls using the method shown in Appendix B page 22 you can fine tune filter frequencies and slopes and attenuate either pair of channels to achieve proper balance For precise filter frequency information refer to Appendix A page 22 Bi Amplified System with one 450 4v2 in four channel mode and a separate subwoofer amplifier This configuration requires that the separate subwoofer a

JL Audio 450/4V2 User's Manual

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