Axiom Home Page Forums General Discussion Technical Questions EP500 HUM

Hi Dr House, yes I tried every outlet in my apartment and even unplugged all other electrical equipment when I did.
I've tried two AMPs from Axiom with the same result.

Hi EFalardeau, unfortunately I would have to buy an UPS to try this option. Whats your though on an AC filter between the outlet and the EP500?

I read on the Polk audio forum about "transformer lamination noise" and is caused by the building and collapsing magnetic field that surrounds the core laminations of the AC power transformers. Does anyone have experience in this field?
Could the EP500 be picking this up from the AC outlet.
It was mentioned in an earlier post to try at work your the neighbors place. Both are not possible but there is a audio store near me that may let me try plugging in the Sub there. That will be a few days away though.

Dragon, to clarify a point, although you did say earlier that it was a "transformer like" humming noise, is this actually a humming electronic sound coming from the driver or a mechanical hum coming from the amplifier itself?

AC filter like a Belkin power conditioner? I am not a big fan of these things even if I do own one (it makes a nice unit-friendly power bar. I got it to try to help my own ground loop problem and it did not. In your case, you might want to try given your distance.

Hi JohnK, it's an electronic sound coming from the driver.

EFalardeau, so a AC filter is a power conditioner? I'm normally a plug it into the wall and everything just works kind of guy, but since still is my first hifi problem I've had to read more about conditioners and electronic stuff...it's like being back at school hahaha

That was a question, not an answer... You mentionned an AC filter and I asked if meant a power conditioner or something else that would be called an AC filter with which i'm unfamiliar (we ALL learn!).
Hopefully things will get resolved soon enough for you. This is the type of problems that can quickly build up into a lot frustration.

Oh sorry EFalardeau yes I see it was a question. AC filter is nothing I came across when I was searching the net for answer on the topic. From what I understand an AC filter is a small box (like an adapter plug) that is meant to block out magnetic interference coming through the AC outlet. It plugs directly into the AC outlet, then your component plugs into the filter.
Only thing is I've not seen anything like that in Japan.
Yeah it's frustrating but step by step I'll conquer this problem.
Everyone's input here is very helpful.

If there's a possibility that it's not the subwoofer and possibly an electrical problem, can you try it at a friends or family members house?

I could be way off base, I didn't read through the entire thread.