Fresh Water Pump Causing Fusion System Speaker High Pitched Whine

[ParkCitySailor]

We have a new headhunter x-caliber 24v dc fresh water pressure pump (self-priming centrifugal pump). Every time it activates it causes a high pitched whine from all of the Fusion Stereo speakers. Occurs if Fusion system is on, but not playing, or when playing from any source. Fusion system has multiple amps for different zones on the boat. Noise impacts all speakers.

Pump is a variable speed pump on a completely separate circuit.

Boat was commissioned in August, so all new systems.

Any solutions appreciated!

[Cheechako]

You need to isolate that pump wiring from the common battery, or possibly even ground system, I suppose. You could try "Chokes" on the stereo wiring. Or a capacitor to ground on the pump wiring . Look up "RF choke".