Question about JBL GT150 Car Subwoofer

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My amp was bad so i replaced it now my sub does not work i checked the wiring that goes from the amp to the speaker and everything seem to be ok then i put another speaker thinking it might be the sub and it still doesnt work does anyone have any suggestion

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  • jazmin062604 Jan 06, 2009

    I want to thank dantechcom I took my stereo out and went through all my wiring and the remote wire was lose the one that connect to the stereo i guess who ever connected it didnt do a very good job


    thanks again


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It doesn't sound like the wiring from amp to sub is your problem.

Is your amp getting a power light ?
Are you sure your remote wire is hooked up properly ?
Check both ends of your RCA cables

Posted on Jan 05, 2009

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How do you know it's not the amp?  Have you tried hooking up good speakers to the same output terminals of the amp?

Speaker failure modes: Usually they fry, the foam surround disintegrates, or there's a bad internal wire connection/solder joint that fails. Subwoofers are designed to handle a lot of power and rarely fail.

There are three possibilities: 
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You don't tell me whether you have a separate amp for the subs with an external crossover, or whether you have one amp with internal crossover and separate internal amps and speakers outputs for subs and standard speakers, so I can't be more specific.

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If the sub voice coil is open, you will get exactly no sound. No crackling, nothing.

Use a multimeter to check the sub voice coil. If the meter reads infinity, the coil is open and to the amp, it's as if there's no sub connected, and you will need to replace it.

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Best way is to have one sub from channel 1 and the other sub from channel 2 for example. Or if its a bridged 4 channel amp, have 1 sub running from channel 1&2, and the second sub running from channel 3&4 still making sure of the polarities. Again this all depending what kind of amp and sub you have.

-----------------------------
For example;
A 4 channel (bridged) 1000W amp. 250W max per channel or 500W per 2 channels! So if you have 2 500W subs, by connecting one to a single channel will decrease subs ability due to the lack of power supplied. However by combining 2 channels you optimize the output!
---------------------------

Once you know all your wiring from your amp to subs are ok/good connections/good wires etc you shouldnt have to "wiggle the wires" to get it to work as this is just a bad connection. Also ensure that no 2 wires are touching. Make sure that the master volume on the amp is turned down. You dont need this to be on loud at all, in fact far from it or you'll risk damaging both the amp and subs!

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