Axiom Home Page Forums General Discussion Technical Questions EP600

I helped a friend setup his new Epic 80-EP600 system this weekend. The receiver is a Denon AVR2807. The problem we have is the EP600 constantly buzzes or hums when there is no source material playing. It seems perfectly fine while watching a dvd. Stop the dvd and the humming begins. The humming even persists while listening to a cable music station.

I tried searching the forums since I figure I can't be the first one with this issue but couldn't find anything (probably searching using the wrong terms).

And before you all ask...

Volume half way or 9 o'clock.
crossover set to bypass.
phase set to 0.
trim set to flat.

Any ideas?

How close is the sub to either of the M80s? I seem to remember a review that said the M80 and EP600 could start "talking" to each other when nothing was playing and they were in close proximity. That's my only guess. Now let the real experts answer.

Have you tried taking out the ground screw?

Funny that the amateur would make a good guess. The M80 is less than 6 inches away. I thought of that but didn't try it since it was late. I'll try moving the sub tomorrow to see if that makes a difference.

Oh, it's probably not a good guess. I found the review I was thinking of, and it wasn't really humming or buzzing, but something much more severe.

http://www.6moons.com/audioreviews/axiom/axiom_2.html

"Making a long story short, I came to realize -- and had it verified by Axiom -- that if the subwoofer is placed too close to the speakers without a signal running through the system, the speakers and the subwoofer become... um, bored. They start talking to each other. I'm not sure who starts the conversation but the speaker talks to the sub, which responds in kind. As with any feedback loop, voices raise and eventually, it becomes an extremely loud conversation at an extremely low frequency. This electronic feedback conversation was notable in that it occurred at so low a frequency as to be inaudible. But it was reproduced with enough raw power to rattle the hell out of my room. It was at this point that I knew this thing was going to be fun! But I was going to have to send the speakers and sub to neutral corners."

Still, maybe it could have something to do with it?

Like Wid said, try removing the ground screw.

I moved the M80 around 4-5 feet away from the EP600 and it still hums. I removed the ground screw and the hum went down dramatically, but it still has a faint hum. Although it is much better, it won't go into standby mode. So, I still consider this problem unresolved.

One thing I did notice is if I turn the sub crossover to 40, it goes away completely. However this solution is useless since I want to keep the sub's crossover on bypass.

Still looking for ideas I guess.

I'm in the same boat. I removed the ground screw, and while the hum was considerably less, it's still there. I haven't tried a ground isolator yet. I'm upgrading to an amp/preamp combo this month, and I'm hoping that, as a side benefit, using an XLR connection to the sub will eliminate the hum. I'm not sure on your next course of action, but a ground isolator might be something to look at. Again, I defer to ANYONE else's opinion here.

http://www.axiomaudio.com/groundisolator.html

Since it goes away when the cross-over is set to 40, it's 60Hz hum from your house wiring.

If any of you can get rid of it let me know as I have the same issue on my 600. It's very low amplitude though so it only bothers me when I don't have anything playing and I'm purposely listening for it.

Maybe y'all should call Axiom...