Question about Jl Audio 300/4 Car Audio Amplifier

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Lost Right Rear Channel

Lost the output of the right rear channel...would like to fix it my self if possible.

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Re: Lost Right Rear Channel

These are very complex amps that mainly use surface mount components. This amp has 4 vertical boards for the individual channels. It's difficult to work between boards and it's easy to damage the main board if you don't have good quality equipment to desolder them. If you want to learn to repair audio equipment, this is not a good starter amp. I'd suggest sending it to JL or a reputable local shop. If you're lucky, it could simply be a case of a dirty contact on a switch or a switch that's not set correctly. Try moving all of the controls and switches before sending it off for service.

Posted on Sep 19, 2007

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I have shure 101 console audio can i connect to power speaker

this is the manual for your mixer. see page 2 for the rear panel diagram. on the rear panel diagram 24-27 are all outputs, you can run them directly to powered speakers, or thru an equalizer to powered speakers or thru power amps to passive speakers.

outputs 24 and 25 are both the right channel outputs, and 26/27, lkeft channel outputs. the reason each channel has 2 outputs is to support either 1/4 inch or trs connectors

Dec 31, 2014 | Car Amplifiers

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Hello, can someone help me, i want to know how to connect the wires if i want to use 2 channel instead of 4. THANKS IN ADVANCE!!!!!!!!!!!!!

You would want to bridge 2 of the left channels and 2 of the right channels, essentially combining the power output of the amp.

This article should help you out:

Essentially you will just be using 2 channels (left, right) instead of 4 (front left, front right, rear left, rear right) essentially combining the power of those outputs. You'll want to check the amp to see if it tells you which of the outputs should be used for the "bridged" method.

Mar 07, 2011 | Koiiler 8686-C Car Audio Amplifier

1 Answer

Can i hook this amp to a 2 channle out put stereo?

Sure. Specs are listed below. I think it's designed for regular 2-channel input, isn't it?


Front Channels: 100 W RMS x 2 @ 1.5 ohm-4 ohm (11V-14.5V)
  • Rear Channels: 25 W RMS x 2 @ 1.5 ohm-4 ohm(11V-14.5V)
  • Subwoofer Channel: 250 W RMS @ 1.5 ohm-4 ohm (11V-14.5V)
  • THD at Rated Power: <0.03% @ 4 ohm (F&R), <0.05% @ 4 ohm (Sub)
  • S/N Ratio (F&R): >108.5 dB below rated power S/N Ratio (Sub): >95 dB below rated power
  • Frequency Response (front and rear): 5 Hz-30 KHz (+0, -1dB)
  • Frequency Response (sub channel): 5 Hz-500 Hz (+0, -1dB)
  • Damping Factor (front and rear): >200 @ 4 ohm/50 Hz
  • Damping Factor (sub channel): >500 @ 4 ohm/50 Hz
  • Input Range: switchable from 200mV-2V RMS to 800mV-8V RMS
  • Differential-Balanced Input Topology: (3 pairs of inputs)
  • Front Crossover: fully-variable (50 Hz-5 KHz), selectable- slope BP or HP (12 or 24 dB per octave)
  • Rear Crossover: fully-variable (50 Hz-5 KHz), selectable- slope HP (12 or 24 dB per octave)
  • Sub Crossover: fully-variable (40-200 Hz), selectable-slope LP (12 or 24 dB per octave)
  • Preamp Output: 2-channel (full-range or LP)
  • Bass EQ: Variable boost up to 15db
  • Infrasonic Filter: defeatable 24dB/octave at 30 Hz
  • Left minus Right Ambience Circuit: ambient effect for rear channels
  • Front and rear speaker output connections: accept up to 8ga. wire
  • Dual mono subwoofer output connections: accept up to 8ga. wire
  • +12V and Ground connections: accept up to 4ga. Wire
  • Dimensions: 19.7"L x 9.25"W x 2.36"H
  • Dec 02, 2010 | Jl Audio 500/5 Car Audio Amplifier

    1 Answer

    What can I do about no output from right rear channel

    Check to see if speaker is blown use another speaker. If it is not blown then your amp has a blown channel local audio shops may know of where to find repairs for your amp. hope this helps.

    Jun 11, 2010 | Jl Audio 500/5 Car Audio Amplifier

    2 Answers

    Front right speaker got wet, started cutting out. at the same time the rear right speaker started cutting. switched the rear speakers to opposite channels and this caused the right to work and left to cut....

    the speaker getting wet will short it out. Shorting the output on any amp will ruin it. there is a right and left chanel with 2 outputs. Right chanel is damaged.

    Sep 30, 2009 | Boston Acoustics GT-42 Car Audio Amplifier

    1 Answer

    What is the wire diagram for the 3way bx35 boss crossover

    Hello rew_smith,

    The wiring diagram is silk screened right on the top of the unit. If your diagram is missing or obscured, you can get one directly from

    The first 3 pairs of connections for subwoofer, front, and rear inputs coming from your receiver or head unit. Top is left channel, bottom is right channel. The 2nd set of connections are the outputs and matched in function to the first set. These are connected to your amp(s).

    To the right of the input/output connectors are the 12V +, remote and ground screw terminals. The 2 switches and 9 controls allow you to set the high-pass frequency and output levels for the front and rear channels, and the crossover frequency, bass boost, phase, and output level for the subwoofer.

    Hope this helps.

    Aug 23, 2009 | Boss Car Amplifiers

    1 Answer

    I have an Infinity 530a 5 channel amp. new

    May be the problem is on the sound you are using is not a 5 channel coded sound or check in the menu´s of the amp if the rear channel´s have sufficient db output, check the connections, check if you amp. is not working only as simple stereo (menus also)

    Hope this helps

    Jun 24, 2009 | Infinity Car Amplifiers

    1 Answer

    How many speakers can I use?

    This should work if channel 3 & 4 are bridged at 4 ohm.
    channel 1 should be stable at 2ohm
    channel 2 should be stable at 2 ohm
    You can hook up the right side speakers together ( + with + and - with - ) . same thing with the left side. this will give you 2 ohm each channel. this will cause your amp to run hot (this might be tuff on the amp). It will give you right (2 speakers) and left ( 2 speakers ), no front and rear adjustement if you need to balance your sound. I think you should be better buying another amp for your sub and take your 4 channels for your 4 car speakers. this amp as a rca output that can feed the other amp ( sub amp ). it is possible to do it.

    Good luck

    Nov 11, 2008 | Alpine MRP-F250 Car Audio Amplifier

    1 Answer


    If you've got a standard 4 speaker system (2 front, 2 rear), your best option is to connect both left speakers to the left channel amp output and both right speakers to the right channel amp output. The only thing you lose is the ability to fade the speakers front to back.

    Mar 04, 2008 | Legacy - American II: 2 Channel 1200W...

    1 Answer


    I recommend you swap your left and right input cables to make sure it's not a source issue.

    So from your headunit, plug the left channel output into your amps right input and your right channel output into your amps left input.

    If the same side is still not working then disconnect both (or single speaker if it bridged) the speakers from the not working side at the amp. Connect the front and then the rear speakers individually and retest to see if one of them works.

    If one does work then check the cabling and speaker connections on the one that doesn't. If it's shorting out anywhere it will stop your amp from powering that channel.

    Failing that, it could just be that your amp has partly failed.

    Feb 15, 2008 | Boss Riot 1500D Car Audio Amplifier

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