Axiom Home Page Forums General Discussion Advice from Axiom Owners Speaker and subwoofer hum

this has also happened to me as well, a quick reset of the sub takes care of the thumping.

thanks to the custom search feature I found this thread. MY ep-500 has a slight hum and vibration.

Originally I was having a hum with all speakers. I unscrewed the chasis ground screw on the back of the sub a bit and it stopped the hum comming through the main speakers.

I thought it was fixed, but upon closer inspection I noticed a hum and a slight vibration comming from my ep500 still.

I am on hold with my cable company trying to get through with someone to get a ground isolator installed

EDIT: may cable company must be flooded with phone calls or something, everytime I get through the automated menu The stupid thing hangs up on me.

Welcome to the world of customer service circa 2007.

Might be faster to just order one from Axiom.

hmmm. Here is the situation:

Chasis ground screw loosened a bit on the ep 500 and cable box plugged in= slight hum in subwoofer.

Chasis ground screw loosened a bit and cable box unpluged= slight hum turns in to a LOUD ROAR.... ?

Chasis ground screw tightened all the way back to normal with cable box plugged in= slight hum

Chasis ground screw tightend all the way back to normal with cable box unplugged= no hum.

My cable company is coming out saturday and I will have them install a ground isolator. Sounds like a ground Isolator on the cable box + chasis ground screw tightened into original setting will eliminate my ground loop problem... what do you think?

what I don't understand is why the hum gets SO FRIGGIN' LOUD with the cable box unplugged from my receiver and the chasis ground screw loosened...

WEIRD!

If all else fails I will buy the axiom ground isolator, but I am going to try and convince my cable company that it is there fault (well it is) and see if they will do it free of charge... (hey it's worth a shot )

Sure, if unplugging the cable stops the hum, then that's the ground loop route that has to be cut.

Thats what I thought, I just didn't understand why unplugging the cable box made the hum louder if the chasis ground screw was unscrewed.

Well my cable company was aboslutely no help. The claimed the problem was with my system, even though unlpugging THEIR cable fixes the problem.

An audio video store down the road from me sells what is called a magic box (Mondial Antenna Ground Isolation Circuit), supposedly made by klipsch: link here.

The product is $110!

I think I will be ordering the ground isolator from axiom for $48.

I am trying to find a cheaper fix than $50, but if I need to I will buy the isolator from axiom.

Tried to edit my post buy too much time had elapsed.

I also might add the cable guy told me that the problem might be that I am using a 'denon' receiver- he has never heard of that brand. He said that he has a sony receiver at home and he reccomends that model! According to him my receiver may be the problem.

Also he said a hum is normal on all speakers, just typically not at low volumes or off completely.

He said when he cranks his speakers up to "max volume" there is a hum/hiss/distortion- and ALL speakers have this problem at higher volumes.

I responded by telling him that the problem might be my speakers since I purchased them from some internet only company that many people have never heard of...

LOL