Things to try:
- Put a heavy-duty noise filter on the main power lead coming from the battery. Radio shack sells a 20-amp noise filter and it seems to be handling the load from my 3 amplifiers okay. This should happen fairly close to the firewall, before the power is split four ways.
- Make sure that all of your audio cables are routed far away from your power cables. Alternator whine is quite commonly caused by inductive noise from the cables.
- Locate any ground loop problems. This is tricky and arcane, but in your case, I'd start by disconnecting the crossover and one of the amps. See if the remaining single amplifier has any noise. If not, then add back in components one at a time (other amp, crossover) until the noise reappears. Then re-ground that component. If you need a "primer" on ground loops, let me know and I'll try to find one or write one.
- Go through these documents carefully:
http://www.installdr.com/TechDocs/999501.pdfhttp://www.installdr.com/TechDocs/999502.pdfhttp://www.audiocontrol.com/techpapers/tech1002.pdf___________
Tony Fabris
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