Hmmmm, I suspect you've got the smaller version of my M-Audio BX-8's. How loud is the buzz?
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could the audio feeds to the speakers be run with some power or data lines that are inducting into the speaker audio?
When I plug the speaker cables into the right speaker (the one without the power), its cone pushes all the way back, and it gives off a soft hum. The left speaker sounds fine.
Switch the speaker cable to the other speaker and see if the problem moves with the cable. If we are lucky it's just a bad cable.
No, I tried a couple of speaker cables. And there's only one cable between the two speakers, the other speaker has a power supply and amplifier built in.
I wonder if the audio input jack got tweaked a little bit. What kind of connection is it into the powered speaker? (what model # M-audio so I can take a view online)
They're M-Audio Studio Pro 4 desktop monitors, which I don't see on their site any more.
Oh, wait. They're "Studiophile DX4" speakers. And they hum when the audio input is unplugged, too.
And in fact, the right speaker is completely dead. It just hums.
where you using the 1/4" or the RCA inputs? I'm wondering if there is something causing a short between the shield and tip on one of the 1/4" inputs. Maybe a piece of schmadda got in there.