I installed my subwoofer this weekend and eveverything was going smooth until I fired it up. Here is my setup and my problem....


SETUP: 4channel USX-4085 amp. Channels 1+2 driving the front components. Channels 3+4 bridged to an elemental K series subwoofer (240 watts). Front HU preout running to channels 1+2 with HU crossover at 80 HPF. Subwoofer preout running to chanels 3+4 with HU crossever at 80 LPF. Amp settings are crossed over slightly higher (tough to gauge amp's scale and the HU crossover is much better anyway)

PROBLEM: Sub is getting signal from 1+2 somehow and is barely moving enough to hear. It sounds like its running off the HPF on the front channels. I can also unplug channel 3+4's RCA cables and the sub is still on so the signal is definately coming from 1+2. (again, i have to really listen to tell if its on or not at High HU volume). The speaker wire is properly bridged on Channels 3+4 by the way. There are NO input settings for where to get 3+4's signal from. (i.e 1+2 or individual signal, so I belive 3+4 are autonomous)


Front componenents are working fine but they are crossed somehow. i.e. left is right and right is left. I don't think i had this problem before (I replaced my old RCAs when i installed both sets this time around.) All connections are fine and the RCA's are correct on the HU. I checked twice.


On another note, when i was connecting the ground lead to the amp my scewdriver sparked when I brushed against the remote turn on lead. The car was off and the power cable for the amp was disconnected. Is it possible I messed up my 3+4 channels???? I'm so damn frustrated!!!:banghead: I bought the amp from Crutchfield so I should be able to get a new one, no hassle buit who knows what the turn around time is.

[Modified by DSTJ99, 8:28 PM 8/9/2003]


[Modified by DSTJ99, 12:38 AM 8/10/2003]

 

Since you are using the crossover on your HU you should disable the crossovers on the amp (set it flat).

Your screwdriver should not have sparked when you brushed it up against ground & the remote-on lead if the system was off. The remote lead does not get power when the system is off.

 

I have the same amp, 4085. But powering 4 sets of components. BTW: Great amp. Anyway, did you adjust the gains on the amp and check the fuses? If so, and still a problem.....I doubt you broke it, considered it is fused properly.

Heres what I would do, disconnect everthing! Start over and one by one hook up each wire and test it. Some the things you mentioned do not make sense.

 

I didn't check the fuses. Good catch. If they are OK. I will pull everything and redo the wires. :cry I wanted to move my amp from behind the seats to the hatch any way.