Hi, I just finished putting my mp3car setup together. I am using the output from my soundcard to connect to a Pioneer DEQ-9200 DSP module and then out to the 2 amps that drive the speakers. The problem is, when I connect my soundcard to the EQ through the RCAs, all I get is a hissing noise -- no music whatsoever. When I turn up the volume the hissing gets louder and still cannot hear any music. I've tried three different RCA cables and multiple sources, but none seem to fix the problem. All of this testing was done with the car off and the ignition in the ACC position. The EQ headunit lights up and detects input. Any suggestions would be appreciated, I'm about to throw this thing out the window. Thanks,

Dave