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Thank you for purchasing a JL Audio amplifier for  

your automotive sound system. 

Your amplifier has been designed and manufactured to exacting 

standards in order to ensure years of musical enjoyment in your vehicle. 

For maximum performance and extended warranty  

coverage, we highly recommend that you have your new amplifier 

installed by an authorized JL Audio dealer.  Your authorized  

dealer has the training, expertise and installation equipment to ensure 

optimum performance from this product. Should you  

decide to install the amplifier yourself, please take the time  

to read this manual thoroughly so as to familiarize yourself  

with its installation requirements and setup procedures.

If you have any questions regarding the instructions in this  

manual or any aspect of your amplifier’s operation, please contact your 

authorized JL Audio dealer for assistance. If you need further assistance, 

please call the JL Audio Technical Support Department  

at (954) 443-1100 during business hours.

owner’s manual

four-channel full-range amplifier

Summary of Contents for 300/4v2

Page 1: ...se and installation equipment to ensure optimum performance from this product Should you decide to install the amplifier yourself please take the time to read this manual thoroughly so as to familiarize yourself with its installation requirements and setup procedures If you have any questions regarding the instructions in this manual or any aspect of your amplifier s operation please contact your ...

Page 2: ...ntinuous exposure to high sound pressure levels can lead to permanent irreparable hearing loss This and 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 yo...

Page 3: ...v2 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 300 4v2 can be operated in the following modes 1 As a full system amplifier in bi amp mode with one pai...

Page 4: ... 300 4v2 uses a conventional 12V remote turn on lead typically controlled by the source unit s remote turn on output The amplifier will turn on when 12V is present at its Remote input and turn off when 12V is switched off If a source unit does not have a dedicated remote turn on output the amplifier s turn on lead can be connected to 12V via a switch that derives power from an ignition switched ci...

Page 5: ...mplifier to overheat Do not do this Instead use a Y Adaptor to split the mono signal into both left and right RCA inputs 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...

Page 6: ... to the rear inputs select 4ch on the Input Mode switch in the Front Input Section Res ult in this mode the user has the ability to control the absolute level of the LF channels relative to the HF channels 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 Status Indicator Lights Protection Circuitry...

Page 7: ...ear Filter Controls Select x1 on the Freq Range switch LP low pass on the Filter Mode switch and 12dB or 24dB on the Filter Slope switch and an appropriate Filter Freq 80 90 Hz is a good starting 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 appropriat...

Page 8: ...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 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...

Page 9: ...et to 21 2V Bridged 6Ω 100W x 1 set to 24 6V Bridged 4Ω 150W x 1 set to 24 6V Bridged 6Ω 100W x 1 set to 21 2V Bridged 3Ω 150W x 1 set to 21 2V Appendix C Input Sensitivity Level Setting Reference Listings 1 Define your front rear channel configuration Stereo Stereo Stereo Bridged or Bridged Bridged 2 Look in the Optimum Configurations listing for your channel configuration If it does not appear h...

Page 10: ...ber Marking Freq Full counter clockwise 58 01 58 02 50 58 03 58 04 58 05 59 06 60 07 61 08 60 63 09 65 10 67 11 69 12 71 13 74 14 75 77 15 80 16 82 17 85 18 90 19 93 20 95 97 21 102 22 107 23 113 24 120 25 127 26 130 135 27 143 28 153 29 171 30 182 31 201 32 200 223 33 253 34 289 35 337 36 404 37 474 38 500 514 39 525 Full clockwise 542 ...

Page 11: ...king 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 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 a...

Page 12: ...ut Voltage Input Sens Input Mode 12dB 24dB Filter Mode Off LP HP x1 x10 Low High Rear Input Section Left Ch Right Ch Input Voltage Input Sens Low High 2ch 4ch 50 60 75 95 130 200 500 300 4v2 Four Channel Full Range Amplifier Rear Filter Controls Filter Freq Hz Filter Slope Freq Range 12dB 24dB Filter Mode Off LP HP x1 x10 50 60 75 95 130 200 500 INSTALLATION NOTES Use this diagram to document your...

Page 13: ...ties 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 ...

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