20 Most Recent JBL CS 60.4 Car Amp - Page 5 Questions & Answers

As you said "the left rear speaker blew and became very hot". This is a symptom for problems at the amplifier stage (burn out internal amp parts, not protected by any fuse and giving DC output power at the speaker may cause this exact kind of problems at the speaker). I suggest a full check for the JBL amplifier at a service center. I don't suggest to use this amp at another speaker. This may destroy this speaker also. Depending on the exact kind of problem at the amplifier you may have to check the wiring between the amp and the burned speaker also, before you install the amp back to the original location.

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Stelios
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the outputs can be getting weak in the circuitry or a corroded ground to the antenna

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I repair car amps for a living and my prices are the chepest in the USA if an amp needs to be sent to me, plus shipping. I get a lot of amps to repair from this site. Sound like you might have to low of an ohms issue. If not I would have to have to look at it. I don't charge a bench fee and give a 90 warranty. I have the same amp in my collection. My prices also rarely exceed $60 to $80, something like yours would be around $40 or $50 plus shipping if you need to ship it to me. I have been doing this for 17 years and have'nt ha a complaint once. I also fix things in amps I see that might need fixing for free. People ask me why I do'nt charge more or fix things for free, is because I'm not hard up for money and I want to help my fellow car audio enthusiests. Let me know if you need my haelp. I will try to help you online first before we need to go further. Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/mark_b53a7494531bf96d

you sound like you have a loose wire if your using the stock head unit you must of had to conn.alot of wire go back through follow from the head unit.If I were you get a audio control x-over.it will kick up the pre amp power.

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I believe you have a weak ground signal. Check the ground location.
Unhook the power fuse from the battery. Remove the ground, peel off the paint behind the bolt and scrape the copper off the back of the connector as well. You want metal to metal basically. Put back in the fuse.

Could also be incorrect wiring to the subs and amp.
Has the amp ever been hooked up before?

it is posible that you used a power cable that is too small i guage and smoked the power supply

It is like + and - the one without coating is - while the coated one is + do not wire them together.