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Help w/ M Audio speakers + phono out from receiver

C

cma2032

New Member
Hi,

For about 8 years now I've used the M Audio AV-40s as my main computer speakers, as well as for light studio work (I do it all on the same computer). I also have a receiver-amplifier hooked to a tape deck and a turntable, that has a phono out. I have a converter from the 1/4" out on that to RCA cables, which are hooked into the back of the M Audio speakers.

2 days ago I added a Sony CD changer to my receiver setup, and late last night (when nothing was being played) I heard a LOUD crashing/rumbling sound, then a LOUD consistent hum from the speakers. I got out of bed and unplugged them once I figured out what it was, and now once they're plugged in, they immediately hum very loudly even with nothing plugged into them and the volume knob all the way down.

I'm assuming these things are unfortunately shot, but did something with the CD player or the receiver cause this to happen, or was that a coincidence? I very, very rarely listen to music on them from the receiver at a volume loud enough to hear even a few rooms away, and I keep the receiver volume extremely low. And again, nothing was playing at the time they "blew."

Any assistance would be much appreciated, as I'd like to get up and running again without damaging anything else.

Thank you!
 
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"Phono out" doesn't make any sense. Is it "LINE OUT" on the receiver, maybe? Or PRE OUT or RECORD OUT? At any rate, assuming you didn't connect speaker outputs from the receiver directly to the low level inputs on the speakers, it's unlikely you did any damage. Sometimes stuff just fails.

There's a decent chance you can convert these to passive speakers, using the receiver to amplify them. The right speaker doesn't need any work, just hook it directly to the speaker terminals on the receiver, but for the left speaker, you'll need to disconnect the internal amp from the internal crossover, and run wires from the crossover to the OUTPUT terminals on the back. Then you'll use those as the speaker inputs. If you're not sure what to do, you can pull the woofers and take pics of what you've got inside, and post them here.
 
No, it's unlikely that the headphone output caused the issue. As I said in my previous post, sometimes things just die.
 
Your M Audio speakers are not the most robust. I have great familiarity with the BX-5 and 5A. The power supply caps on those fail after a few years. Yours may have as well.
 
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