Originally Posted by h20boy2
DavidAnalog, I tried exactly what you said and am still getting the weird noise. But as soon as I unplug the RCAs from the amp the sound stops. Any other suggestions?
So you can assume that there is no supply or ground loop between the EQ and amplifier because both are terminated to the same spots.
And you can assume from your tests that the issue is probably either with the EQ or EQ to amplifier interface.
Here are a couple more thoughts.
The EQ has an internal switch that changes the signal ground (above ground) to power supply ground relationship (specifically to assist with noise resulting from equipment mismatches). Try the switch in the other position.
Also, while inside, make sure that neither of the internal adjustable input gains are wide open.
Try a substitute RCA draped across the outside versus buried in the boat.
If the noise is only present with the key on, whether the boat is running or not, then change the EQ proximity to the surrounding dash, modules, etc. Or, try it with the battery only, and the battery totally disconnected from the boat.
If you cannot narrow the noise cause then return the EQ to your dealer or Wetsounds. A defect is possible.
Also, NEVER unplug or plug in audio components (RCAs) while receiving power. That is a sure way to get exactly what you are describing.