Thanks, I'll be interested to know.

Hooked mine up that way today and it's working fine.

God Bless,
Don

No problem whatsoever this evening plugging the S-950's output into the RCA plugs - worked perfectly, no hum at all, very clean and clear sounds. Graham, I really don't believe the problem is with the Bose L1 Compact at all. Unfortunately, I will not be sailing to Fort Meyers this winter, just the east coast and Keys, so no onsite evaluation or diagnosis from me unless you want to drive to Marathon, which is about an 8 hour haul from your place.

All the best,

Gary

could this be a problem OTHER then the BOSE and maybe something with the devices hooked into it...
maybe a simple GROUND Plug could solve it?

I tried it too. No problem.

I decided to create a video to show my problem to Bose and Sweetwater. Here it is. Any comments or suggestions much appreciated as always.

I haven't reviewed the thread lately, but have you tried plugging one unit, say the keyboard, directly into the Bose. Nothing else plugged in. If this works, then slowly add the other connections back it til you find the culprit.

After while, I will bring a Compact in and try to reproduce the problem here at home.

Don, yes, hopefully the video shows that's exactly what I did.

Never mind, I see you already did my first suggestion and it didn't help.
Have you tried reversing the plug that goes into the PA900, I think it fits either way.

have you tried hooking up to a different amp ? and see if it happens
it's obviously a connection problem.