Hard to tell without you posting your specs. Are you using balanced or unbalanced speaker connectors? If you are not sure look at your connectors. Balanced has a tip/ring/sleeve and unbalanced just has tip /ring. Are you recording guitar? Touching the pickups will amp up the noise if using tip/ring.

they're balanced. This problem just started happening after about 3 yearsi unplug the firewire speakers and anything else plugged in and it still does it

Have you changed anything recently? Almost sounds like a grounding issue. Is it across all your channels whether you have something plugged in or not?

I haven't changed anything. Yes it is across all channels whether anything plugged in or not.

I think it's time to send it in for repair. It could be a loose solder joint on the circuit board that could be grounding something out. 3 years seems like a short time, except for electronics. :/

Somewhere in the old forum there was an issue with a Elco in the powersupply .
You could search on that!


Edit: Found it!

http://forumsarchive.presonus.com/posts/list/19976.page

Awesome. I'm gonna have a friend check it out. He's good with this kinda stuff. Thanks so much!

I opened it up and looks like this cap is the one that needs to be replaced

Share us the results please?