Axiom Home Page Forums General Discussion Technical Questions EP500 HUM

Yes, that's what I'd assumed that you meant. If instead it was the transformer vibrating to cause a hum(which all transformers do to some extent), it could be excessive because of the 50Hz AC or some DC polluting the supply and increasing the vibration. Again, if the power supply section of the sub amplifier is working correctly, electronic hum should be at an inaudible level.

Hi wheelz999, I have an hifi store near where I live. So if they are friendly enough I will see if they will let me plug in the sub in the store. I'll have to wait until Monday though because of my work hours.

Hi JohnK, yeah Brent from Axiom thought along the same line as you as well. He send a replacement AMP that was modified to accept 50 and 60Hz. I'm guessing it's what you send about power supply being polluted. Tonight I actually was able to bring home an UPS that has a warning light on the back which comes on if the AC power supply is bad or not ground correctly. I plugged it in to all the AC outlets and the light came on every time. I tried the sub plugged into the UPS too and got the same hum. So I could been stuck with this problem maybe.

If every outlets tests bad, it may be that your service is wired incorrectly into the building. Call an electrician, or your landlord to call an electrician. It probably isn't a hard fix, and isn't to code right now.