JL Audio 300/2 User's Manual
Contents
1. 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 13 Doing so will result in audible distortion and possible speaker damage JL AUDIO 300 2 JL AUDIO 300 2 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 to the each amplifier or channels in a system 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 Amp Filter Section ction Amp Filter Controls Amp Freq Range Filter Slope Input jhPass x1 x10 12dB 24dB Low gt 95 i A 75 130 Filter Mode J 50 500 OFF LP HP Ch Filter Freq Hz Le Filter Mode Control This switch allows you to configure the filter into one of two filter types or defeat it completely Off Defeats the filter for that channel section completely allowing the full range of frequencies present at the inputs to feed the amplifier This is useful for systems utilizing outboard crossovers or requiring full range reproduction from the 300 2 LP Low Pass Configures the filter to attenuate frequencies above the selected filter frequency Useful fo2. JL AUDIO 300 2 two channel full range amplifier owner s manual 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 vebicle 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 amplifiers 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 Eastern Time Zone JL AUDIO 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 hig
3. 300 2 17 INSTALLATION NOTES Use this diagram to document your amplifier s switch and control positions 1 2VDC Ground Remote JL AUDIO 300 2 two channel full range amplifier 18 JL AUDIO 300 2 Preamp Output Section Output Mode LLL Full Range Low Pass High Pass Amp Filter Controls Freq Range Filter Slope LT LL x1 x10 12dB 24dB 95 i 1433 Filter Mode 200 zoo OFF LP HP Left Ch Right Ch Filter Freq Hz Amplifier Input Section Input Voltage Input Sens ll Low High Left Ch Right Ch Speaker Outputs OCOOC Bridged JL AUDIO 300 2 19 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 accident misuse abuse product modification or neglect f
4. allow for a sufficient connection with the input or output of the amplifier Check the output of the amplifier Using the procedure explained in the previous check item after plugging the RCA 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 5 volts 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 above MY AMPLIFIER S OUTPUT FLUCTUATES WHEN ITAP 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 amplifier terminal Check the RCA connectors to ensure that both the center pin and the outer shield are making good contact with the input jacks on the amplifier HOW DO I PROPERLY SET THE INPUT SENSITIVITY ON MY AMPLIFIER Please refer to Appendix B page 3 to set the input sensitivity for maximum low distortion output JL AUDIO 300 2 15 APPENDIX D 300 2 Specifications GENERAL SPECIFICATIONS Recommended Fuse Value 40A Recommended Fuse Type AGU or Maxi
5. battery lo prevent voltage drops these wires should be upgraded to 4 AWG when installing amplifier systems with main fuse ratings above 60A JL AUDIO 300 2 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 300 2 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 No fuse is required or recommended directly before the amplifier power connection If one is desired we recommend the use of a 40A AGU fuse or MaxiFuse type TURN ON LEAD The 300 2 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 tum off when 12V is switched off Ifa source unit does not have a dedicated remote turn on output the amplifiers turn on lead can be connected to 12V via a switch that derives power from an ignition switched circuit The 300 2 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 ampl
6. 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 This can be used to diagnose a short circuit by only connecting one of channel at a time 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 300 2 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 0 volts This may happen in a rapid cycle when bass heavy program material causes a weak charging system to dip below 0 volts momentarily If this is happening in your system have your charging system inspected to make sure it is working properly A 0 5 or 0 Farad rapid discharge capacitor connected in parallel to the amplifier power connections will minimize these short duration voltage dips
7. in most systems that are having this problem For information on troubleshooting this amplifier refer to Appendix C page 14 10 JL AUDIO 300 2 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 the JL AUDIO Technical Department for assistance 954 443 1100 9 00 AM 5 30 PM Eastern Time Monday Friday JL AUDIO 300 2 11 APPENDIX A Precise Frequency Selection Chart FILTER FREQ AMP FILTER Detent Panel Actual Number Marking Freq Full counter clockwise 58 ON certs 58 JJ i ETTET 58 J tac E 58 EEEE AE EET 58 tE TET TITELE TETIT a7 JJ N TEE 60 a T ATESTAT 6l JJ SOON aration 63 Oras athe oud eae ata eee 65 a ee er 6 7 Lb teas ere EE 69 JJ 7 J TEENE 74 J O 7 J ena heat nae 80 JJ eaeeeaees 82 CEEE TETTE Creer 85 JJ E PE ERE 20 eee eer er 93 A Sen c
8. make sure that they are set according to the needs of the system 13 Install power wire fuse 40A for a single 300 2 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 3 for the recommended input sensitivity setting method 16 Enjoy the fruits of your labor with your favorite music JL AUDIO 300 2 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 300 2 two channel full range amplifier The 300 2 s 12 VDC and Ground connections are designed to accept 8 4 AWG power wire 8 AWG is the minimum recommended power wire size for this amplifier If you are installing the 300 2 with other amplifiers and wish to use a single main power wire use 2 AWG or 1 0 AWG main power wire 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 possib
9. Filter Slope selected in the Amplifier Filter section This mode can be useful for feeding a second satellite amplifier when the 300 2 is being used to drive the main speaker system NOTE The signal level of the Preamp Output is affected by the setting of the Input Voltage Range switch of the amplifier See the Input Voltage Range section page 7 for details on Input Voltage settings The preamp output level is not affected by the Input Sens rotary control SPEAKER OUTPUTS The 300 2 employs JL AUDIO s exclusive Regulated Intelligent Power Supply R I PS design This sophisticated power supply allows the amplifier to produce its optinum power 300 watts over a wide range of speaker impedances Unlike conventional amplifiers that require a specific impedance to produce optimum power the RI PS equipped 300 2 gives you the freedom to use a variety of speaker configurations that achieve final impedances between 1 5 4Q nominal per channel without sacrificing power output or sound quality The operation of the R LPS circuitry is entirely automatic and adjusts itself every time the amplifier is turned on according to the lowest impedance present at the speaker outputs 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 ition Speaker Outp
10. Fuse INPUT SECTIONS No of Inputs One Stereo Pair Input Type Differential balanced with RCA jack inputs Input Range Switchable from 200mV 2V RMS to 800mV 8V RMS AMPLIFIER SECTION Amplifier Topology Class AB 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 IS0W RMS x 2 5 4Q IIV 14 5V Rated Power Bridged 300W RMS x 3 8Q I IV 14 5V THD at Rated Power lt 0 03 4Q per channel 20 Hz 20 kHz Signal to Noise Ratio gt 08 5 dB referred to rated power A weighted 20 Hz 20 kHz noise bandwidth Frequency Response 5 Hz 30 kHz 0 dB Damping Factor gt 200 4Q per ch 50 Hz gt 100 2 per ch 50 Hz Slew Rate 25V us AMPLIFIER FILTER Filter Type State variable 2 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 PREAMP OUTPUT 2 Channel switch selectable as pass through type tracking High Pass or tracking Low Pass linked to Amplifier Filter DIMENSIONS LxWxH 13 4 x 9 25 x 2 36 340mm x 235mm x 60mm Due to ongoing product development all specifications are subject to change without notice 16 JL AUDIO 300 2 JL AUDIO
11. ad 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 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 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 Filter Slope Input Sensitivity Selection Control Pg 8 Pg 7 Filter Frequency Range S
12. ailure 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 manufacturing date code Coverage may be invalidated as this date is pr
13. cation 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 300 2 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 8 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 5 for important notice 7 Securely mount the amplifier using the supplied screws 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 amplifier 10 Connect the RCA input cables to the amplifier 11 Connect the speaker wires to the amplifier 12 Carefully review the amplifiers control settings to
14. elector Input Voltage Range Selector Amp Filter Controls Amplifier Input Section Output Mode Freq Range Fitter Slope m Leil ca O O90600 Full Range Low Pass High Pass x1 Z x10 12dB 24dB Low High oO Left Ch 95 i 75 a30 Filter Mode Q 50 soo OFF LP HP Right Ch Fitter Freq Hz Left Ch Right Ch Left and Right Filter Filter Left and Right Preamp Output Jacks Cutoff Mode Input Jacks pg 9 Frequency Selector pg 7 Selector pg 8 ps 8 Speaker Outputs ps 9 pg 8 Ps 7 Ps 9 Speaker Outputs If mounting the amplifier under a seat make sure there is at least inch 2 5 cm of space above the amplifier heat sink fins 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 You should also take the time to securely mount the amplifier using the supplied screws so that it does not come loose in the event of a collision or a sudden jolt to the vehicle 15 Ibs of aluminum traveling at 60 MPH will hurt you 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 e Do not run system wiring outside or underneath the vehicle This is an extrem
15. ely 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 JL AUDIO 300 2 PRODUCT DESCRIPTION The JL Audio 300 2 is a two channel full range amplifier utilizing patented Absolute Symmetry Class AB technology for both channels These channels benefit from JL Audio s exclusive R I PS power supply design which optimizes the output of for any impedance between 5 and 4 ohms per channel 3 8Q bridged The 300 2 s flexible input and crossover sections permit operation with a wide variety of source units and system configurations TYPICAL INSTALLATION SEQUENCE The following represents the sequence for a typical amplifier installation using an aftermarket source unit 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 minimum 8 AWG from the battery location to the amplifier mounting lo
16. et voltage is observed with the voltmeter If excessive voltage is read with the control at minimum full counterclockwise switch the Input Voltage switch to High and re adjust 9 Once you have adjusted the 300 2 to its maximum low distortion output level reconnect the speaker s The Input Sens controls can now be adjusted downward if the amplifier 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 boost circuit including source unit tone controls or EQ circuits EQ cuts will not require re adjustment Nom Target AC Voltage Impedance Bridged 49 0V AVE 34 6 V 30 0 V not recommended not recommended JL AUDIO 300 2 13 APPENDIX C TROUBLE SHOOTING MY AMPLIFIER DOESN T TURN ON 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 12V wire to the Remote terminal to see if the ampli
17. evels can occur when the charging system voltage drops below 10 volts 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 is also a good idea to improve the vehicle s factory ground wire and termination point Grounding problems are the leading cause of mis diagnosed amplifier failures 144 JL AUDIO 300 2 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 RCA cables from the amplifier prior to this test The frequency used should be in the range that is to amplified by the amplifier example 50 Hz for a sub bass application or kHz for a full range high pass application A steady voltage should be present at the output of the RCA cables If you are receiving a sufficient voltage between 0 2 and 8 0 volts check to ensure that the speaker wires are making a good connection with the metal inside the amplifier The connectors are designed to accept up to an 8 AWG wire If you are using significantly smaller wire 14 AWG or smaller you may have difficulty making an adequate connection In this case you may find it necessary to fold the wire over once or twice so as to make a solid connection Make sure to strip the wire to
18. evious 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 during normal business hours 9 00 AM 5 30 PM Eastern Time 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 AB 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 JL3002MAN CH 04 2003
19. fier turns on If this does not work proceed to the next step 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 I 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 or between a speaker lead and the vehicle s chassis ground If a short is present you will experience distorted and or attenuated output The Low Q light may also 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 between 1 5 4Q 3 8Q bridged Check the input signal and input signal cables to make sure signal is present at the Amplifier Input Section 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 SHUTS OFF ONCE IN A WHILE USUALLY AT HIGHER VOLUMES Check your voltage source and grounding point The RI PS power supply is rated to operate with source voltages between 14 5V Shutdown problems at higher l
20. h 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 2V negative ground electrical systems Use of this product in vehicles with positive ground and or voltages other than 2V 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 Chassis Ground Connector pg 5 12V Power Remote Turn On Connector Connector pg 5 pg 6 12VDC Ground Remote JL AUDIO 300 2 two channel full range amplifier 2 JL AUDIO 300 2 Preamp Output Signal Selector Preamp Output Section PLANNING YOUR INSTALLATION It is important that you take the time to re
21. ifier using the supplied hex wrench Strip 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 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 INPUT SECTION The 300 2 has one input section which contains a pair of RCA type input jacks an Input Voltage switch and an Input Sens rotary control Amplifier Input Section D 3 lope Input Voltage Input Sens E 24dB Low High 1 Left Ch Right Ch Input Voltage Range A wide range of signal input voltages can be accommodated by the 300 2 s input section 200mV 8V This wide range is split up into two sub ranges accessible via a switch located in the Amplifier Input Section The Low position on the 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 on the Input Voltage swi
22. le and should connect to the 300 2 with 8 4 AWG power wire Please note that smaller AVVG numbers mean bigger wire and vice versa 1 0 AWG is biggest 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 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 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 The use of a star washer to lock down the connection is advisable Any wires run through metal barriers such as firewalls must be protected with a high quality rubber grommet to prevent damage to the insulation of the wire Failure to do so may result in a dangerous short circuit mIMPORTANT 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
23. ne recorded at O dB reference level in the frequency range to be amplified for that set of channels 50 Hz for subwoofer channels kHz for a midrange application Do not use attenuated test tones 10 dB 20 dB etc The Nine Step Procedure 1 Disconnect the speaker s from the amplifiers 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 feed the 300 2 3 Switch the Input Voltage to Low and turn the Input Sens control all the way down 4 Set the source unit volume to 3 4 of full volume 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 the amplifier outputs 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 the 300 2 at 3 4 source unit volume 7 Connect the AC voltmeter to the 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 8 Increase the Input Sens control until the targ
24. r connection of subwoofer s to the 300 2 HP High Pass Configures the filter to attenuate frequencies below the selected filter frequency Useful for connection of component speakers to the 300 2 in a bi amplified system 2 Filter Slope Control This switch allows you to select from two filter slopes for that channel section 2dB Configures the filter to attenuate frequencies above or below the selected filter frequency at a rate of 2 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 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 xI position the range of the rotary control is 50 500 Hz as marked In the x10 position the range of the rotary cont
25. rol 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 chart in Appendix A page 12 of this manual JL AUDIO 300 2 PREAMP OUTPUT SECTION The 300 2 incorporates a flexible preamp output section so that additional amplifiers can be added to the system This pre amp output can be configured three different ways using the switch labeled Output Mode in the Preamp Output Section Preamp Output Section Amp Output Mode Freq Re Ej j Lt Full Range Low Pass High Pass x1 x a Left Ch Right Ch Filter Fre 1 Full Range The preamp output delivers the same signal that is connected to the 300 2 s Amplifier Inputs 2 Low Pass The preamp output delivers the same signal that is connected to the 300 2 s Amplifier Inputs with Low Pass filtering applied to it at the Filter Freq and Filter Slope selected in the Amplifier Filter section This mode can be useful for feeding a subwoofer amplifier when the 300 2 is being used to drive the main speaker system 3 High Pass The preamp output delivers the same signal that is connected to the 300 2 s Amplifier Inputs with High Pass filtering applied to it at the Filter Freq and
26. tch 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 speakerlevel sources splice the speaker output wires of the source unit or small amplifier onto a pair of RCA plugs 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 counterintuitive It is consistent with the descriptions above 2 Input Sensitivity Adjustment Located next to the Input Voltage switch in the Amplifier Input Section nput 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 the 300 2 for maximum clean output Rotating the control clockwise will result in higher sensitivity louder for a given Input voltage Rotating the control counterclockwise will result in lower sensitivity quieter for a given input voltage To properly set the amplifier for maximum clean output please refer to Appendix B page 3 in this manual After using this procedure you can then adjust the Input Sens level downward if this is required to achieve the desired system balance
27. ueees Seo iTar cu 97 r EEEE eee AT O2 a eee vee ea eae 107 Io ETET EET eas 13 DAY ee tee sine Sacer hee beaks 120 D9 TTET E EE EE 27 JOa to du seat BO ii aod Lm 35 oY ee eee 43 DO EEEIEI EA TET 53 OF ETETE esas TEET 7 OO PETE TES 182 I eese An E 201 OD es endess 200 aaa 213 L AEE 253 Del Read eg ei ae ee ee ee 289 OO Na eaves as E aged das 33 7 OC ETETE ETTET 404 T EE PEE TE EEE AA So PEETI 500 aaa 514 OF E E EE S 525 Full clockwise 542 12 JL AUDIO 300 2 APPENDIX B Input Sensitivity Level Setting JL Audio amplifiers utilizing the Regulated Intelligent Power Supply R IPS allow delivery of their rated power when connected to any load impedance from 1 5 4Q per channel 3 8Q bridged and when connected to a charging system with any voltage from 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 e CD with a sine wave test to
28. uts j EH IMPORTANT IMPORTANT If you connect a load higher than 4Q nominal per channel in stereo mode or 8Q in bridged mode power will drop by half with every doubling of impedance above 4Q stereo 8Q mono If you connect a load lower than 5Q nominal per channel in stereo mode or 3Q 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 0 for details IMPORTANT Speaker loads below 5Q nominal per channel in stereo or 3Q nominal in bridged mode are not recommended and may cause the amplifier output to distort excessively JL AUDIO 300 2 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 The combined output of the two channels provides twice the output voltage available from a single channel The 300 2 has been designed for bridging of its channel pairs without the need for input inversion adaptors tion Speaker Outputs j To bridge a pair of channels use the Left and Right speaker connectors only the Left and Right remain unused Vhen bridged the 300 2 will deliver optimum power into a 3 8Q load Operating a bridged 300 2 into a load lo
29. wer 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 source unit 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 Why a mono signal If you are bridging a pair of channels and use a stereo input the only information that will reach the amplifier stage is the common phase portion of the signal This may be useful for passively deriving a center channel signal but is not going to give you a defined left or right channel If you are looking to reproduce a single channel s signal you must split the mono signal with a Y Adaptor and connect it to both left and right RCA inputs for the bridged channel pair 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 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
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