Alternator Whine from one amp...
 

The whine is driving me absolutely nuts.

I have 2 amps... rockford fosgate punch400 [4chan] which powers 4 interior component speakers and a elemental designs Nine.2 powering a 11kv.2 subwoofer.

The rockford fosgate is causing alternator whine. If I leave the RF amp off and the ED on.. there is no whine

If i take out the RCAs from the RF, there is still whine [so i dont think its head unit]

I sanded down the ground point quite nicely w. a dremel and sandpaper

I also added another negative batt to chasis ground

Any ideas? maybe a "ground loop isolator" type thing?

RCAs and Power are running on opposite sides btw.
Power wire is 2 guage split into 4 guage.
Ground for Nine.2 is 4 guage
Ground for RF is 4 guage split into 8 guage [rf only takes 8 guage wires]
Splitters and distro blocks are knukonceptz
RCAs are monster cable.. so is speaker wire.

the frequency produced by alt whine is much more easily heard through tweets, so it may not just be the one amp...Try another ground point altogether. Is the ground wire beefy enough for the run?

Still whine with the RCA's out of there, huh. Don't think I've had that one before. interesting...

Do the Big-3 and re-do every ground it can be a ground in the engine bay