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It sounds like the power supply failed. Generally when the supply fails in that amp, you have to replace all 8 of the power supply FETs and all 8 of the 47 ohm surface mount resistors. Many times, the supply fails because one or two of the output transistors have failed.

If you want to have JL repair it, you MUST go through an authorized JL dealer.

If you have a good local repair shop, they should be able to repair it.

Let me know if you have any other questions.

Jl Audio 500/1... | Answered on Feb 16, 2019


Definitely check to make sure your amp and speaker enclosure are securely mounted to your vehicle, also check all wiring connections- it sounds like something is loose or there's a short. Secure everything and triple check all connections & I believe all will be well. If you need further help please don't hesitate to ask!

Jl Audio 500/1... | Answered on Jan 14, 2019


If you have the old ones that you are trying to replace, Radio shack has tons, as well as guides to show you how the bands are deciphered. Hope this helps

Jl Audio 500/1... | Answered on Nov 27, 2018


In your world, what does best results mean to you.

how are the hifonics mounted? open air, closed box, vented box (optimized to what freq)? trunk or inside vehicle?

all these variations weigh heavily on your configuration. As does what 'best results" means to you.

Jl Audio Car... | Answered on Nov 19, 2018


Check the remote lead and see if it is getting power at the amp when it won't come on that way you know if the issue is with the head unit or the amplifier.

Jl Audio 500/1... | Answered on May 26, 2018


Sounds like you are running your subs at to low of ohm. Amps are rated differently on the levels of ohms or resistance that they can get to. If you have a dual 4ohm sub and run it in pairrell it will drop to 2ohm and if you run the same sub in series it will be 8ohm. Your amp will go into protection if the ohm is to low.

-david

Jl Audio 12W6... | Answered on May 08, 2018


Request the schematic diagram directly from JL Audio.

Jl Audio Car... | Answered on Feb 18, 2018


Most modern amps are DC coupled. That means the bias (and therefore the quiescent current) for the later power stages (those stages that do the work and get warm) is set in the earlier stages.

The high gain of the earlier stages means a tiny change there can produce big changes in the way the later stages work. Those early stages are sensitive and more delicate so some damp and dust or dirt can cause far reaching damage.

Time to consult a repair shop...

Jl Audio 500/1V2... | Answered on Nov 13, 2017


Internal amp short on that channel. Repair or replace.

Jl Audio 300/4... | Answered on Oct 11, 2017


Check your ground to make sure it is properly grounded

Jl Audio Car... | Answered on May 02, 2017

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