Question about JBL Car Amplifiers

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Amplifier problem amp is connected perfectly in my car i checked all the wireings everything is perfect amp turns on but the subwoofer doesnt play a sound i tried different subwoofers but same problem... sumone please help me with my situation.... amp doesnt go on protect mode... alll the fuses are fine... but no sound!

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Try this it may help do you have a frend that you could swap amps with just to test (put your amp in a working system to check yor amp) as it could be a number of things it could be no out put from the head unit or a break in the rca cables or dare i say it but the amp could be blown it may even be speaker cable from amp to sub or the remote not working have fun !

Posted on Jan 07, 2009

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I have my amp hooked up perfectly, but why won't it work? is there a re-set or somthing? i checked fuses and everything


Unlike the stereo unit, amps doesn't have a reset button.

Check the fuse in your hood.
Check all wiring, especially the ground to chassis.
Check for voltages, remote turn on should have 12V to ground and power cable should have around 12 to 14 volts.

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  • make sure the subwoofer level is up on the head unit.
  • Make sure the RCA cables are good.
  • Make sure the remote wire is connected and has 12v+ when the head unit is on.
If the remote wire is not turning on the amp, its not going to work. To hot wire it to see if thats the problem, just run 12v+ to the remote jack. That will turn on the amp.

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1 Answer

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make sure your wires arent freyed and touching itll protect if any wires touch so ur system doesnt short check all cables from deck and most of all make sure your ground connection is solid if it rattkes aroud itll fry your amp i had the same prob need n e thing else just holler

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1 Answer

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Hello, The problem your having is in the power supply section. If you want it repaired I will repair it for you. I own my own business. I install car audio/video systems in cars, trucks,etc. I also do amplifire repair. I am the cheapest repair business you will find. If your interested send me an e-mail at skinnman33@gmail.com if you have'nt allready had it fixed. I'll repair it for $40 you pay shipping. I have a website if you wanna check out but it's not even close to being finished. I got rid of my old page and server and I'm just trying different backgrounds and layouts. I'm just upgrading everything cause we are moving to a bigger facility. Again let me know. Good luck

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Quick question, amp problem


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1 Answer

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if your amplifier has the internal Kicker card dealie "little computer card on the side that you can change out crossover settings and such," Turn off the vehicle, remove this device and make sure the contacts on the card are clean and free from black soot (showing a spark). clean the contacts with a pencil eraser or something hard but soft... and put the little card back in place, start the car again and see if that helps, I used to lose one speaker every once in a while with the same amp. I ended up replacing the module with a different one from my dealer and it worked fine (still does and it's been in my car 6 years). Check that little module. if this doesnt work, while the car is running and the music is "playing" wiggle the card and see if it works sometimes and not others. Likely is the little module.

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1 Answer

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here is a short test you can try, remove the rca audio cable from the amp & connect a diskman or toher audio o/p device that you can hook up with the same rca wires, turn on the amp & see if you have sound. you can also remove the speaker wires from the sub & using multi meter read the ohm's of the sub, most subs are 4 ohm. Hope this help locate your problem

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