300/4v3 Manual
Contents
1. The 300 4v3 employs two separate but identical filter sections for its front and rear channel pairs These sections consist of the following controls 1 Filter Mode Control This switch allows you to configure the filter into one of two filter types or to defeat it completely Off Defeats the filter for that channel section 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 LP Low Pass Configures the filter to attenuate frequencies above the selected filter frequency Useful for connection of subwoofer s to that channel section HP High Pass Configures the filter to attenuate frequencies below the selected filter frequency Useful for connection of component speakers to that channel section in a bi amplified system 2 Filter Slope Control This switch allows you to select from two filter slopes for that channel section 12dB Configures the filter to attenuate frequencies above or below the selected filter frequency at a rate of 12 dB per octave Butterworth alignment 24dB Configures the filter 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 m2. khead e fhe Curve OWNER S MANUAL gt Fy I gt J LAY 2 300 W CLASS A B FOUR CHANNEL FULL RANGE 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 Ifyou 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
3. position on the Input Mode switch and connect a single pair of input cables to the input jacks in the Front Input Section In this mode the amplifier will route the signals connected to the front inputs to the rear inputs as well If you wish to use separate inputs for the front and rear channel sections to allow front to rear fading for example and the source unit is equipped with front and rear outputs select Ach on the Input Mode switch 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 300 4v3 s input sections 200mV 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 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 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 6 JL Audio 300 4v3 Owner s Manual on each Input Voltage switch selects an input sensitivity range between 800m
4. 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 Printed in China 300 4v3MAN CH 01 2012
5. 0V Stereo 40 75W x 2 set to 173 V ch Stereo 40 75W x 2 set to 173 V ch Stereo 40 38W x 2 set to 12 3V ch Bridged 4O 150W x 1 set to 24 6V Stereo 30 75W x 2 set to 15 0 V ch Stereo 30 75W x 2 set to 15 0 V ch Stereo 40 28W x 2 set to 10 6V ch Bridged 30 150W x 1 set to 21 2V Stereo 20 75W x2 set to 12 3 V ch Stereo 20 75W x 2 set to 12 3 V ch Stereo 30 75W x 2 set to 15 0V ch Bridged 160 SOW x 1 set to 30 0V Stereo 1 50 75W x 2 set to 10 6 V ch Stereo 1 50 75W x2 set to 10 6 V ch Stereo 30 75W x 2 set to 15 0V ch Bridged 120 75W x 1 set to 30 0V Stereo 30 75W x 2 set to 15 0V ch Bridged 8O 100W x 1 set to 30 0V OPTIMUM CONFIGURATIONS Stereo Bridged Stereo 30 50W x 2 set to 12 3V ch Bridged 40 150W x 1 set to 24 6V 1st Pair of Channels Stereo 2nd Pair of Channels Bridged Stereo 30 38W x 2 set to 10 6V ch Bridged 30 150W x 1 set to 21 2V Stereo 40 75W x 2 set to 173 V ch Bridged 80 150W x 1 set to 34 6 V Stereo 20 75W x 2 set to 12 3V ch Bridged 16 38W x 1 set to 24 6V Stereo 30 75W x 2 set to 15 0 V ch Bridged 60 150W x 1 set to 30 0 V Stereo 20 75W x 2 set to 12 3V ch Bridged 120 50W x 1 set to 24 6V Stereo 20 75W x 2 set to 12 3 V ch Bridged 4O 150W x 1 set to 24 6 V Stereo 20 75W x 2 set to 12 3V ch Bridged 8Q 75W x 1 set to 24 6V Stereo 1 50 75W x 2 set to 10 6 V ch Bridged 30 150W x 1 set to 21 2 V Stereo 2
6. 300 4v3 Owner s Manual APPENDIX A Input Sensitivity Level Setting JL Audio amplifiers utilizing the Regulated Intelligent Power Supply R LP S allow delivery of their rated power when connected to any load impedance from 1 5 40 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 e Digital AC Voltmeter 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 DE amplifier s Front Speak
7. 75 watts x 4 See we told you this amp was different Read on there is more important information to follow 1 Rear Speaker Outputs Fr GID 2099 Bridged Fike H IMPORTANT For optimum power output at all four channels connect the same impedance between 1 5 4Q on all four channels On pages 16 and 17 are charts showing the continuous RMS power output capability of the 300 4v3 into various combinations of front and rear impedances optimum output is shown in bold type Please refer to these charts so you know what to expect in terms of power output H IMPORTANT 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 10 for details H IMPORTANT Speaker loads below 1 50 nominal per channel in stereo or 30 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 pro
8. For information on troubleshooting this amplifier refer to Appendix E page 20 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 10 JL Audio 300 4v3 Owner s Manual SYSTEM CONFIGURATIONS The 300 4v3 is a 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 drawings on Page 22 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 sep
9. The second stereo pair of source unit outputs is connected to the rear inputs select 4ch on the Input Mode switch in the Front 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 DES 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 front inputs of the 300 4v3 The source unit s dedicated subwoofer output is connected to the rear inputs select 4ch on the Input Mode switch in the Front 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 H IMPORTANT Set the rear channel Input Sens with the source unit s subwoofer level control set at 3 4 of full output See Appendix A page 14 for details Crossover Setup for Bi Amplified System with one 300 4v3 Once the input sections have been configured appropriately go to the Rear Filter Controls Select x1 on the Freq Range switch LP low pass on the Filter Mode switch and 12dP or 24dB on the Filter Slope switch and an appropriate Filter Freq 80 90 Hz isa good st
10. all other high power amplifiers are capable of producing such 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 emplo
11. 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 output 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
12. power wires to the amplifier s power connector plug Then insert the power connector plug into the amplifier s power connector receptacle pushing firmly 9 Connect the RCA input cables to the amplifier 10 Connect the speaker wires to the speaker connector plugs and insert the plugs firmly into the speaker connector receptacles 11 Carefully review the amplifier s control settings to make sure that they are set according to the needs of the system 12 Install power wire fuse 40A for a single 300 4v3 and reconnect the negative battery post terminal 13 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 4 JL Audio 300 4v3 Owner s Manual 14 Make necessary adjustments to the input sensitivity controls to obtain the right overall output and the desired balance in the system See Appendix C pages 16 17 for the recommended input sensitivity setting method 15 Enjoy the fruits of your labor with your favorite music 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 person during installation 12VDC Ground Remote JL AUDIO 300 4v3 Four Channel Full Range Amplifier 12V Battery Connection You will need to connect a power wire to
13. set to 34 6V Stereo 80 38W x 2 set to 173 V ch Stereo 40 75W x 2 set to 173 V ch Bridged 160 SOW x 1 set to 30 0V Bridged 60 150W x 1 set to 30 0V Stereo 80 28W x 2 set to 15 0 V ch Stereo 30 75W x 2 set to 15 0 V ch Bridged 160 38W x 1 set to 24 6V Bridged 4O 150W x 1 set to 24 6V Stereo 80 19W x 2 set to 12 3 V ch Stereo 20 75W x 2 set to 12 3 V ch Bridged 160 38W x 1 set to 21 2V Bridged 30 150W x 1 set to 21 2V Stereo 80 14W x 2 set to 10 6 V ch Stereo 1 50 75W x2 set to 10 6 V ch Bridged 120 100W x 1 set to 34 6V Bridged 120 100W x 1 set to 34 6V Stereo 60 50W x 2 set to 173 V ch Stereo 40 75W x 2 set to 173 V ch Bridged 120 100W x 1 set to 34 6V Bridged 80 150W x 1 set to 34 6V Stereo 60 38W x 2 set to 15 0 V ch Stereo 30 75W x 2 set to 15 0 V ch Bridged 120 100W x 1 set to 30 0V Bridged 60 150W x 1 set to 30 0V Stereo 60 25W x 2 set to 12 3 V ch Stereo 20 75W x 2 set to 12 3 V ch Bridged 120 100W x 1 set to 24 6V Bridged 4O 150W x 1 set to 24 6V Stereo 60 19W x 2 set to 10 6 V ch Stereo 1 50 75W x2 set to 10 6 V ch Bridged 120 100W x 1 set to 21 2V Bridged 30 150W x 1 set to 21 2V Stereo 40 50W x 2 set to 15 0 V ch Stereo 30 75W x 2 set to 15 0 V ch Bridged 80 100W x 1 set to 30 0V Bridged 60 150W x 1 set to 30 0V Stereo 4O 38W x 2 set to 12 3 V ch Stereo 20 75W x 2 set to 12 3 V ch Bridged 80 50W x 1 set to 24 6V Br
14. 0 75W x 2 set to 12 3V ch Bridged 60 100W x 1 set to 24 6V Stereo 20 56W x 2 set to 10 6V ch Bridged 30 100W x 1 set to 21 2V OPTIMUM CONFIGURATIONS Bridged Bridged Stereo 1 50 75W x 2 set to 10 6V ch Bridged 160 28W x 1 set to 21 2V 1st Pair of Channels Bridged 2nd Pair of Channels Bridged Stereo 1 50 75W x 2 set to 10 6V ch Bridged 120 38W x 1 set to 21 2V Bridged 80 150W x 1 set to 34 6 V Bridged 80 150W x 1 set to 34 6 V Stereo 1 50 75W x 2 set to 10 6V ch Bridged 80 56W x 1 set to 21 2V Bridged 60 150W x 1 set to 30 0 V Bridged 60 150W x 1 set to 30 0 V Stereo 1 50 75W x 2 set to 10 6V ch Bridged 60 75W x 1 set to 21 2V Bridged 40 150W x 1 set to 24 6 V Bridged 40 150W x 1 set to 24 6 V Stereo 1 50 75W x 2 set to 10 6V ch Bridged 40 112W x 1 set to 21 2V Bridged 30 150W x 1 set to 21 2 V Bridged 40 150W x 1 set to 21 2 V SUB OPTIMUM CONFIGURATIONS BRIDGED BRIDGED SUB OPTIMUM CONFIGURATIONS Stereo Stereo 1st Pair of Channels Bridged 2nd Pair of Channels Bridged 1st Pair of Channels Stereo 2nd Pair of Channels Stereo Bridged 160 75W x 1 set to 34 6V Bridged 160 75W x 1 set to 34 6V Stereo 80 38W x 2 set to 173 V ch Stereo 80 38W x 2 set to 173 V ch Bridged 160 75W x 1 set to 34 6V Bridged 120 100W x 1 set to 34 6V Stereo 80 38W x 2 set to 173 V ch Stereo 60 SOW x 2 set to 173 V ch Bridged 16 75W x 1 set to 34 6V Bridged 80 150W x 1
15. 3 36 olds bees byte esa 24 289 BO De beach adag pua Gees 337 BO pP 404 Di Sey meres ee nen ee tA 474 3B spins des 500 igati 514 duntur E ee eee ia a 525 Full clockwise 542 18 JL Audio 300 4v3 Owner s Manual APPENDIX E TROUBLE SHOOTING How do I properly set the input sensitivity on my amplifier Please refer to Appendix A page 14 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 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 betwee
16. 300 4v3 can be operated in the following modes 1 As a full system amplifier in bi amp mode with one pair of channels driving subwoofers in low pass mode 75W x 2 or 150W x 1 and the other pair of channels driving main speakers in high pass mode 75W x 2 2 As a four channel satellite amplifier in a bi amplified system delivering high passed signals to front and rear speaker systems The 300 4v3 s flexible input and crossover sections permit operation with a wide variety of source units and system configurations The 300 4v3 can operate with a single pair of stereo inputs or with separate inputs for front and rear channels if the source unit is equipped with front and rear outputs 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 connection during installation This step is not optional 2 Run power wire 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 4 AWG is recommended f
17. V 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 XD CLRAIC2 SW Ey important 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 given input voltage To properly set each pair of amplifier channels for maximum clean output please refer to Appendix A page 14 in this manual After using this procedure you can then adjust the relative level of each channel pair by adju
18. WG 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 FRONT AND REAR INPUT SECTIONS The 300 4v3 has two separate input sections one for its front channels and another for its rear channels Each section contains a pair of RCA type input jacks an Input Voltage switch and an Input Sens rotary control Front Input Section Rear Input Section InputVoltage Input Sens Input Mode Input Voltage Input Sens Low High T 2ch 4ch Low High T by Left Ch Right Ch Left Ch Right Ch The Front Input Section also contains an Input Mode switch to allow 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 300 4v3 with a single pair of stereo inputs select the 2ch
19. appropriate power connections and fuse protection Ground Connection The chassis ground connection must be made using 4 AWG pure copper wire 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 with a brass or copper power ring 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 H 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 pure copper wire when installing amplifier systems with main fuse ratings above 60A TURN ON LEAD The 300 4v3 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 s turn on lead can be connected to 12V via a switch that derives power from an ignition switched circuit The 300 4v3 s Remote turn on connector is designed to accept 18 A
20. arately 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 300 4v3 can be configured to drive a bi amplified system by itself or with a separate subwoofer amplifier Bi Amplified System With One 300 4v3 In this configuration the rear channels of the 300 4v3 will drive subwoofers stereo 75W x 2 or bridged 150W x 1 with low pass filtering The front channels will drive component speakers in stereo 75W x 2 with high pass filtering Input connection options for a bi amplified system with one 300 4 v2 are as follows A No User Adjustability Required a basic source unit or processor with one pair of stereo outputs Input Connections a single pair of stereo source unit outputs connected to the front channel inputs of the 300 4v3 select 2ch on the Input Mode switch in the Front Input Section Result the relative level of the LF and HF channels will be fixed by the 300 4v3 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 processor with front and rear pairs of outputs Input Connections the first stereo pair of source unit outputs is connected to the front inputs of the 300 4v3
21. arting point Next turn your attention to the Front Filter Controls 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 front and rear Input Range and Input Sens controls using the method shown in Appendix A page 14 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 D page 18 Bi Amplified System with one 300 4v3 in four channel mode and a separate subwoofer amplifier This configuration requires that the separate subwoofer amplifier has a built in low pass filter All JL Audio subwoofer amplifiers have this feature In this configuration the front channels of the 300 4v3 will drive front component speakers stereo 75W x 2 with high pass filtering The rear channels will drive rear component speakers in stereo 75W x 2 also 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 Input connection options for a bi amplified system with one 300 4v3 and a separate subwoofer amplifier are as follows A No User Adjustability Required a basic source unit or processor with left and righ
22. ay 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 for greater energy overlap with the rest of the speaker system In some cases this results in better overall response and sound quality 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 Appendix D page 18 of this manual SPEAKER OUTPUTS Even though you may have installed zillions of amps in your day please take the time to read this section The 300 4v3 is not a typical amplifier and care must be taken to balance the front and rear channel speaker impedances for optimum output from all four channels The 300 4v3 empl
23. duces signals of equal magnitude but opposite polarity The combined output of the two channels provides twice the output voltage available from a single channel The 300 4v3 has been designed for bridging of its channel pairs without the need for input inversion adaptors Front Speaker Outputs ode Booo 5 Bridged 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 XD CLRAICY 1F2M sold separately When bridged each channel pair will deliver optimum power into a 3 8Q 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 8 JL Audio 300 4v3 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 amplifi
24. ended Fuse Value 40A Recommended Fuse Type AGU or MaxiFuse Input Sections No of Inputs Two Stereo Pairs Front Rear Input Type Differential balanced with RCA jack inputs Input Range Switchable from 200mV 2V RMS to 800mvV 8V RMS Amplifier Section Amplifier Topology Class A B with patented Absolute Symmetry dual N Channel MOSFET output design Power Supply Independent pulse width modulation reg ulated switching power supply with multistage impedance optimizing circuitry Rated Power Stereo 75W RMS x4 1 5 40 11V 14 5V Rated Power Bridged 150W RMS x 2 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 Filter Sections Front and Rear Filters 2 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 Defeatable Dimensions H x W x D 2 36 in x 134 in x 9 25 in 60mm x 340mm x 235mm Due to ongoing product development all specifications are subject to change without notice APPENDIX C Input Sensitivit
25. er 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 300 4v3 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 listings on pages 16 amp 17 find the configuration that matches your specific speaker impedance as connected to the 300 4v3 Note whether your channels are in stereo or bridged and use the appropriate listing section Once you have found your configuration note the target voltage for input sensitivity adjustment for each channel section This target voltage is listed in parentheses as set to x volts 6 Verify that you have disconnected the 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 Front Speaker Outputs or Rear Speaker Outputs connectors of the amplifier If the channel pai
26. er 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 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 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 e 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 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 PRODUCT DESCRIPTION The JL Audio 300 4v3 is a four channel full range amplifier utilizing patented Absolute Symmetry Class A B 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
27. er is turned on and operating normally 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 the amplifier 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 There is only one condition that will shut down an undamaged 300 4v3 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 on 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
28. 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 21 INSTALLATION NOTES Use this diagram to document your amplifier s switch and control positions 12VDC Ground Remote JL AUDIO 300 4v3 Four Channel Full Range Amplifier Rear Filter Controls Freq Range Filter Slope x1 x10 12dB 24dB 95 75 130 Filter Mode 50 500 Off LP HP Filter Freq Hz Rear Input Section Input Voltage Input Sens LL O Low High QOO a Left Ch Right Ch Rear Speaker Outputs OOOO Bridged Front Filter Controls Freq Range Filter Slope ET EE xi x10 12dB 24dB 95 75 130 Filter Mode 50 500 Off LP HP Filter Freq Hz Front Input Section Input Voltage Input Sens Input Mode En Cy m 2ch 4ch Low High SY Left Ch Right Ch Fro
29. idged 4O 150W x 1 set to 24 6V Stereo 40 28W x 2 set to 10 6 V ch Stereo 1 50 75W x 2 set to 10 6 V ch Bridged 80 50W x 1 set to 21 2V Bridged 30 150W x 1 set to 21 2V Stereo 30 SOW x 2 set to 12 3 V ch Stereo 20 75W x 2 set to 12 3 V ch Bridged 60 100W x 1 set to 24 6V Bridged 4O 150W x 1 set to 24 6V Stereo 30 38W x 2 set to 10 6 V ch Stereo 1 50 75W x 2 set to 10 6 V ch Bridged 60 100W x 1 set to 21 2V Bridged 30 150W x 1 set to 21 2V Stereo 20 56W x 2 set to 10 6 V ch Stereo 1 50 75W x 2 set to 10 6 V ch 16 JL Audio 300 4v3 Owner s Manual APPENDIX D Precise Frequency Selection Chart FILTER FREQ FRONT REAR FILTERS Detent Panel Actual Number Marking Freq Full counter clockwise 58 paeem ER 58 OZ cse eee C PEN 58 OE seite ARA AERE AIT 58 Dd Liebe tetea e AERE 58 OD E EE 59 I E EEE A EA 60 TS eden toad ry E 61 Das geniai O0 Ee aestu 63 OD ENAERE E ETET 65 1 NNMERO 67 p pererem em cut Od 69 PPS 71 Sine athe aa EDE 74 Be oS sanicdneds PTD iy shane Labs 77 B om eae tad viret eti e ee rud 80 B eoi td ad od a aS 82 p 85 Oese a EE E teta io d 90 ETT 93 audiet PB stresses ante 97 Zl susti ons 02 DDt anenee a eE ea 07 P APEE E NEAT 13 p A S tree Te eT 20 dO xa DA ua EAE 27 PO EE ais AET 35 DT utut eel Red dd 43 ABL actores t rotae Mes 53 Pe EE EEEE 71 DD PUN 82 3 deest E ea 201 KP PECES 2007 pied 223 Sie sc Decet masad tti 25
30. ltage Rear Channel Filter Frequency Input Voltage Input Mode Front Channel Connector Connector Range Selector Range Selector Speaker Outputs Range Selector Range Selector Selector Speaker Outputs pg 5 pg 6 pg 8 pg 6 pg 8 pg 8 pg 6 pg 6 pg 8 l E I La h I A 412VDC Ground Remote Rear Filter Controls Rear Input Section Rear Speaker Outputs Front Filter Controls Front Input Section Front Speaker Outputs 4 b Freq fange Filter Slope input Voltage Input Sens Freq ange Filter Slope ry InputVoltage InputSens Input Mode xi x10 m m 12dB 24dB m D Low High M 12dB 24dB mp mw Low High 2ch 4ch 75 E 130 Filter Mode On on 75 2L 330 Filter Mode i JL AUDIO 3200 4 m d V Qa i aule Four Channel Full Range Amplifier 50 500 Off LP HP r pee i 50 soo Off LP HP peaeeicheene se pee Filter Freq Hz Left Ch Right Ch Bridged Filter Freq Hz Left Ch Right Ch Bridged Rear Channel Rear Channel Rear Channel Front Channel Front Channel Front Channel Filter Cutoff Filter Mode Left and Right Filter Cutoff Filter Mode Left and Right Frequency Selector Selector Input Jacks Frequency Selector Selector Input Jacks pg 8 pg 6 pg 8 pg 7 pg 6 2 JL Audio 300 4v3 Owner s Manual 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 prop
31. n 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 amplifier s output fluctuates when 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 20 JL Audio 300 4v3 Owner s Manual My amplifier shuts off once in a while usually at higher volumes Check your voltage source and grounding point The power supply of the 300 4v3 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
32. nductive than pure copper wire Only use pure copper power wire such as JL Audio s Premium Power Wire Tinned copper wire silver color is acceptable as the tin plating is only a very minor component of the wire Fuse Requirements The installation of a fuse on the main power wire within 18 wire inches 45 cm of the positive battery terminal is vital to protect the wire and the vehicle from fire in the event of a collision or short circuit The fuse value at each power wire should be just high enough for all of the equipment being run from that power wire Do not use a fuse with a value that far exceeds the total fuse rating of the electronics connected to the wire If only the 300 4v3 is being run from that power wire we recommend a 40A fuse be used AGU big glass fuse or MaxiFuse big plastic body fuse types are recommended If other amplifiers are also being powered from a main power wire and exceed 80 amps in total fuse rating we recommend the use of an ANL large blade fuse and holder at the battery plus a fused distribution block near the amplifiers Each amplifier must be fused independently at the outputs of the fused power distribution block We recommend appropriately rated MaxiFuse fuses and a JL Audio fused distribution block Please consult with your JL Audio dealer to make sure that the wire fuse holder and fuse ratings are appropriate for your system s needs The safety of your installation depends on
33. 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 manufacturing 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
34. nt Speaker Outputs OOOO Bridged 22 JL Audio 300 4v3 Owner s Manual 23 LIMITED WARRANTY AMPLIFIERS USA JL AUDIO warrants this product to be free of defects in materials and workmanship for a period of two 2 years The warranty is extended to three 3 years total if installation is performed by an authorized JL Audio dealer using a JL Audio Premium Power Connection System for power wiring This warranty is not transferable 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 accident 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
35. or wire runs greater than 72 inches 180 cm in length Use of 8 AWG power wire is acceptable for shorter runs such as from a power distribution block to the amplifier or from a trunk mounted battery Use a2 AWG or 1 0 AWG main power wire with a fused power distribution block when additional amplifiers are being installed with the 300 4v3 and powered from the same main power wire 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 or interface processor to the amplifier mounting location 5 Run speaker wire from the speaker systems to the amplifier mounting location 6 Find a good solid bare metal grounding point close to the amplifier and connect the negative power wire to it using appropriate hardware Use minimum 8 AWG power wire no longer than 36 inches 90 cm or 4 AWG wire up to 60 inches 150 cm long from the amplifier to the ground connection point In some vehicles it may be necessary to upgrade the battery s ground wire as well See page 6 for important notice 7 Securely mount the amplifier using appropriate hardware 8 Connect the remote turn on wire and the positive and negative
36. oys JL Audio s exclusive Regulated Intelligent Power Supply R LP S design This sophisticated power supply allows the amplifier to produce its optimum power 300 watts 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 300 4v3 gives you the freedom to use a variety of speaker configurations that achieve final impedances between 1 5 4 Ohms nominal per channel without sacrificing power output or sound quality 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 either front or rear channels There are no user controls to configure The system operates through three stages of impedance optimization choosing the stage most appropriate to the actual impedance of the speakers connected to it Because the 300 4v3 utilizes a single power supply it will set itself up based on the lowest impedance present at either the front or rear amplifier channels For example if you connect a 2 ohm load to each front channel and a 4 ohm load to each rear channel the amplifier will adjust itself to deliver 75 watts x 2 to the front 2 ohm loads but will only deliver half its optimum power 37 5 watts x 2 to the rear 4 ohm loads If you connect a 4 ohm load to all four channels or a 2 ohm load to all four channels the amplifier will deliver
37. r 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 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 low distortion 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 14 JL Audio 300 4v3 Owner s Manual H IMPORTANT Do not increase any Input Sens setting for any amplifier channel or channel pair 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 boost circuit including source unit tone controls or EQ circuits EQ cuts will not require re adjustment Please refer to Input Sensitivity Level Setting Reference Listings on the next pages APPENDIX B 300 4v3 Specifications General Specifications Recomm
38. sting 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 A page 14 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 front and rear channels and any 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 Front And Rear Filter Section Front Filter Controls Rear Filter Controls Freq Range Filter Slope Freq Range Filter Slope xi xi0 12dB 24dB x1 x10 12dB 24dB 95 75 L 130 Filter Mode 75 j30 Filter Mode 1 Nj a 50 500 Off LP HP 50 500 Off LP HP Filter Freq Hz Filter Freq Hz
39. t stereo outputs Input Connections a single pair of stereo source unit outputs is connected to the front inputs of the 300 4v3 select 2ch on the Input Mode switch in the Front Input Section and also connected to the subwoofer amplifier inputs via a pair of Y Adaptors like the JL Audio ECS model XD CLRAICY 1F2M Alternatively the 300 4v3 can receive its input from the subwoofer amplifier s preamp output set to full range mode Result the relative level of the LF and front and rear HF channels will be fixed by the 300 4v3 s Input Sens settings as well as the subwoofer amplifier s 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 processor with front and rear pairs of stereo outputs Input Connections one stereo pair of source unit outputs is connected to the front inputs of the 300 4v3 select 2ch on the Input Mode switch in the Front Input Section The second stereo pair of source unit outputs is connected to the subwoofer amplifier inputs 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 300 4v3 s Input Sens settings and will not be user adjustable from the front of
40. the vehicle fading the signal to the subwoofer amplifier C 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 front inputs of the 300 4v3 select 2ch on the InputMode switch in the Front Input Section The source unit s dedicated subwoofer output is connected to the subwoofer amplifier inputs 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 H IMPORTANT Set the subwoofer amplifier s Input Sens with the source unit s subwoofer level control set at 3 4 of full output D 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 front inputs of the 300 4v3 The second stereo pair of source unit outputs rear typically is connected to the rear inputs of the 300 4v3 select 4ch on the Input Mode switch in the Front Input Section The source unit s dedicated subwoofer output is connected to the subwoofer amplifier inputs Result with this option the user has the ability
41. the vehicle s positive battery terminal using an appropriate power ring or specialized battery terminal connector such as the JL Audio XB BTU or XD BTS This connection must be tight and corrosion free to ensure proper connectivity This wire MUST be fused appropriately for safety Any power wires run through metal barriers such as firewalls must be protected with 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 Power Wire Requirements The 300 4v3 s 12 VDC and Ground connections are designed to accept 4 AWG power wire 4 AWG pure copper wire is recommended for any power wire run longer than 72 inches 180 cm For runs shorter than 72 inches 8 AWG pure copper power wire is acceptable If you are installing the 300 4v3 with other amplifiers and wish to use a single main power wire use 2 AWG or 1 0 AWG pure copper wire as a main power wire This 2 AWG or 1 0 AWG power wire should terminate into a fused distribution block mounted as close to the amplifiers as possible and should connect to the 300 4v3 with 4 AWG or 8 AWG pure copper power wire Please note that lower 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 Ey important We do not recommend the use of copper clad aluminum wire or CCA wire because this wire is significantly less co
42. 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 Hn IMPORTANT Set the subwoofer amplifier s Input Sens with the source unit s subwoofer level control set at 3 4 of full output Crossover Setup for Bi Amplified System with one 300 4v3 and a separate subwoofer amplifier Once the input and preamp output sections have been configured appropriately go to the Front Filter Controls and Rear Filter Controls You will set both control sections identically to start Select x1 on the Freq Range switch HP high pass on the Filter Mode switch and 12dB or 24dB on the Filter Slope switch and an appropriate Filter Freq 80 90 Hzisa good starting point Select the same settings for the Rear Filter Controls After proper adjustment of the 300 4v3 s front and rear Input Sens controls and the subwoofer amplifier s input sensitivity controls 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 300 4v3 use the method shown in Appendix A page 14 For precise filter frequency information for the 300 4v3 refer to Appendix D page 18 Refer to the subwoofer amplifier owner s manual for proper adjustments 12 JL Audio
43. y Level Setting Reference Listings SUB OPTIMUM CONFIGURATIONS Stereo Bridged 1 Define your front rear channel configuration Stereo Stereo Stereo Bridged or Bridged Bridged 1st Pair of Channels Stereo 2nd Pair of Channels Bridged 2 Look in the Optimum Configurations listing for your channel configuration If it does not appear Stereo 8Q 38W x 2 set to 173V ch Bridged 160 75W x 1 set to 34 6V here look for it in the Sub Optimum Configurations listing for your channel configuration Stereo 8Q 38W x 2 set to 173V ch Bridged 120 100W x 1 set to 34 6V 3 Once you have found your specific combination of impedances use the target voltage listed in Stereo 80 38W x 2 set to 173V ch Bridged 80 150W x 1 set to 34 6V parentheses for each set of channels to set the Input Sens controls of the 300 4v3 Stereo 8Q 25W x 2 set to 15 0V ch Bridged 60 150W x 1 set to 30 0V Stereo 80 19W x 2 set to 12 3V ch Bridged 4O 150W x 1 set to 24 6V For easy reference channels achieving optimum power have their power output listed in bold type Stereo 8Q 14W x 2 set to 10 6V ch Bridged 30 150W x 1 set to 21 2V Stereo 40 75W x 2 set to 173V ch Bridged 160 75W x 1 set to 34 6V OPTIMUM CONFIGURATIONS Stereo Stereo Stereo 40 75W x 2 set to 173V ch Bridged 120 100W x 1 set to 34 6V 1st Pair of Channels Stereo 2nd Pair of Channels Stereo Stereo 4Q 50W x 2 set to 15 0V ch Bridged 60 150W x 1 set to 30
44. ys an advanced type of heat management called RealSink 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 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 Amplifier mounted vertically with heat sink fins pointing laterally Fair Amplifier mounted vertically with heat sink fins pointing down Poor not recommended Rear Channel Rear Channel Front Channel Front Channel Chassis Ground Filter Slope Input Sensitivity Filter Slope Input Sensitivity Connector Selection Control Selection Control pg 6 Rear Channel P9 8 Rear Channel P9 7 Front Channel P9 8 Front Channel P9 7 Front Channel 412V Power Remote Turn On Filter Frequency Input Vo
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