Question about Jl Audio 12W3 Car Subwoofer

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Subs sound terrible (Ive tried so many things)

First off I know its not the subs or the amp.... Hooked them up to a different car and they sounded GREAT. two different sets of amps and subs. ive tried 2 10 inch MA audio subs with a 800w Xplod amp and then two ten inch kickers with a 325w rockford punch amp). both sets sound fine in other peoples cars.
wire them into my Impreza and they sound like ****. more of a vibrating knocking instead of a low bass sound. Once in a while they will pound beautiful for like 5 minutes then go back. I've tried changing the ground wire, the power wire, and the two cords that plug from the deck to the amp, and the speaker wires that connect the amp to the subs. The amp POWER light IS lit.

Could it possibly be my battery? orrr.....

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NO it won't be your battery. Sounds more like your deck.

Posted on Jan 22, 2009

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If you have tried different amps and different subs with the same result, I'd definitely suspect that you are not getting enough of an output signal from the head unit. Checking the RCA's and perhaps using a different set of preamp outs would be a good idea.

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This is a multi-tiered question. First of all, you're going to want to run the subs at a 2ohm load (if the amp is capable) to get the maximum power from it. Use the 5.0.1 for the subs only, that's what it's designed for. Run the cap in conjunction with only the sub amp as it has the largest power requirement. You can not link the two amps to increase output as they are first of all different amps and second of all not designed to run that way. Some amps are but they must be identical.
Set the crossover on the sub amp probably no higher than 80Hz (I like it lower than that but that's a personal preference) and turn the sub-sonic filter off.
Now, one of the most important things about a subwoofer is it's encosure. If it's a properly built box designed for your subs specifically then you should be ok. You dont' specify if it's ported or sealed etc. That would be helpful to know as well as it's approximate size (air volume).
The head unit can also have some bearing on how things sound, as I recall the Sony X-Plod units are fairly decent for the price and if set up properly should sound ok.

If you need further assistance please provide a little more info about the sub enclosure etc.

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if you are sure its the amp. the problem is internal. but if your not sure, try a different stereo or source of sound to the inputs of the amp. if there is still no sound than it is the amplifier and it could be a number of things.

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