Question about Jl Audio 300/4 Car Audio Amplifier

1 Answer

Lost Right Rear Channel

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

Posted by on

  • epabillo Nov 06, 2007

    I have a similar problem with my amp with 2 channels. And no its not the RCA's. I tried changing the rca with the front and then the back and whatever I plug to that chanel it makes crackin noises. Any ideas anyone?



1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Master
  • 631 Answers

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


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

My rca RTD313i home theater system is only out putting sound through the Sub, and the front speakers. The center, and the rear speakers lost sound. How do I fix this??

Have you got it set up right so it can output in multi channel sound? You might have got the setting for just stereo output.

Jun 27, 2015 | RCA Audio Players & Recorders

4 Answers


go to audio set up and configure the system for 5.1 or higher sound output.then only all the speakers ll work

Jan 03, 2008 | Yamaha RX-V640 6.1 Channels Receiver

1 Answer

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 Audio & Video

1 Answer

Speaker leads shorted on right rear channel of Logitech Z-5500 system

First check the speakers by connecting to front connector if thr no sound then replace the speakers.If you here sound while swap the rear amp IC might be damaged replace the IC .

Dec 19, 2011 | Logitech Z-5500 Computer Speakers

1 Answer

Hi i trying to figure out how to wire up my rca's i have a pionner deck in on the back of it it has front output,rear output,sub output ,and also a audio output .now im trying to up it to a clarion eq that...

The "Front output" from the Pioneer deck would connect to the "Main In" on the Clarion EQ. I'm assuming that your Clarion EQ can only deal with one input, and will send the adjusted (equalized) signal out both of the outputs.
The "Front output" from the Clarion EQ should go to the "Front Input" on the 4 channel amp.
The "Rear output" from the Clarion EQ should go to the "Rear Input" on the 4 channel amp.
The "Sub output" from the Pioneer deck would connect to the Left/Right Input on the Epicenter. The Left/Right Output on the Epicenter would need a Y-splitter for each side, so that you could connect each amp separately. One suggestion would be to use one sub amp for both subs.

Feb 18, 2011 | Clarion Car Audio & Video

1 Answer


Red - Power - Connect to Acc on ignition or battery positive. Connected to Battery the unit will not power down when the ignition is switched off
Yellow - Memory back-up. Connect to battery positive
Black - Connect to vehicle earth or battery negative
Blue/white - Used to power up remote power amplifier or power antenna. Do not draw more than 300mA at 12V from this line
White + White/black - Front left channel
Grey + Grey/Black - Front right channel
Green + Green/black - Rear left channel
Violet + Violet/Black - Rear right channel
Use the wire with the black line in it for negative on any channel.
Do not earth any speaker wires.
RCA output jacks are used to send the output from the unit to an amplifier if you have one and cannot be used to power a speaker.

Dec 29, 2010 | Pioneer DEH-2100 CD Player

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


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

Sony STR DE485 (Audio Video Reciever)

Your problem must be caused by the right channel (rear, front whatever..)side feeding resistor on the power supply.

May 05, 2007 | Sony STR-DE485 Receiver

Not finding what you are looking for?
Jl Audio 300/4 Car Audio Amplifier Logo

Related Topics:

135 people viewed this question

Ask a Question

Usually answered in minutes!

Top Jl Audio Car Audio & Video Experts

Mark Skinner

Level 2 Expert

77 Answers

Tygh Duval
Tygh Duval

Level 2 Expert

300 Answers


Level 2 Expert

150 Answers

Are you a Jl Audio Car Audio and Video Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides