As Bitt said, it's important to narrow down the location of the problem. The possible places for a problem are:

- Inside the empeg itself (unlikely).

- Problems at the back of the sled's docking connector.

- Something wrong or miswired in the wiring between the empeg and the amplifier. For example, a sharp metal edge cutting into the RCA cables.

- A fault in the amplifier itself.

- Something wrong or miswired in the speaker wiring.

You need to go through like Sherlock Holmes and eliminate each possibility until you've narrowed it down.