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#280443 - 11/25/09 02:26 AM EP500 HUM
Reddragon Offline
enthusiast

Registered: 02/21/09
Posts: 33
Hello fellow Axiom enthusiasts, I finally brought the Axiom Epic60/500 system about one week ago now. It's a fantastic system with a Denon AVC4310 A/V receiver (called AVR4310CI in north America). However I have the very irritating sub hum with nothing connected to it. Currently Brent from Axiom is trying to help me isolate the problem and he has been very helpful. So in the mean time I will try the forum to see what comments come back.
At first Brent thought maybe an internal AMP problem and sent me a new replacement AMP but with the same resulting problem. I have tried unplugging everything electrical in the apartment and tried the SUB in different AC outlets but still hum. My only guess is that it's coming directly from the AC outlet to the EP500. I live in a high rise apartment building in Japan on the 13 level. AC is 100v 50HZ. The new AMP Brent sent was modified to accept 100v 50/60Hz because we thought the difference in Hz might have been causing the problem. I'm thinking I have to put something between the AC outlet and the EP500 power cord to try and eliminate what is coming through the outlet? I appreciate any suggestions you can give me.

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#280445 - 11/25/09 02:30 AM Re: EP500 HUM [Re: Reddragon]
Ken.C Offline
shareholder in the making

Registered: 05/03/03
Posts: 18044
Loc: NoVA
I assume you've tried the usual cheater plug fix? I doubt that would apply, since you mentioned that it hums without anything connected to it, but hey...
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#280449 - 11/25/09 02:42 AM Re: EP500 HUM [Re: Ken.C]
jakewash Offline
shareholder in the making

Registered: 12/26/03
Posts: 10415
Loc: Calgary, Alberta
I would try a good quailty surge suppressor or something along the lines of the Belkin PF60 which a few of us on the forum have, unfortunately I can't say whether or not it would help as I bought it strictly for eye candy and ease of a central plugin for all the electronics.
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#280451 - 11/25/09 03:04 AM Re: EP500 HUM [Re: Ken.C]
Reddragon Offline
enthusiast

Registered: 02/21/09
Posts: 33
Hi kcarlile, yes I've tried with and without a cheater plug. I even tried my Denon power cord as it fits the EP500 but got the same transformer like humming noise. Thanks for the suggestion though

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#280452 - 11/25/09 03:11 AM Re: EP500 HUM [Re: jakewash]
Reddragon Offline
enthusiast

Registered: 02/21/09
Posts: 33
Hi jakewash, the Belkin PF60 sure looks like eye candy alright hehehe. There is a local audio store near where I live that may let me take the sub in and try there AC outlet to see what happens and may have the gear you suggested. My experience in Japan is normally no one will help you unless you show them the money but it's worth a shot.
Thank for you suggestion.

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#280454 - 11/25/09 04:52 AM Re: EP500 HUM [Re: Reddragon]
JohnK Offline
shareholder in the making

Registered: 05/11/02
Posts: 10634
Dragon, it still appears to be a problem with the internal sub amplifier, despite the fact that it's been replaced already. With nothing connected to the sub but the power cord it can't be a ground loop hum because there's nothing to form a loop. The rectifier and filter capacitors in the power supply section of the sub amp are supposed to supply clean DC, with inaudible hum, to the amplifying section.
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#280456 - 11/25/09 07:03 AM Re: EP500 HUM [Re: JohnK]
Reddragon Offline
enthusiast

Registered: 02/21/09
Posts: 33
Hi JohnK, so that means I would have to try yet another AMP? Axiom sent a letter with the replacement saying it had been tested in a enclosure and was working with no problems.
I've sent Brent an email, so I will see what he comes up with.
Thanks for your input.

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#280463 - 11/25/09 07:58 AM Re: EP500 HUM [Re: Reddragon]
EFalardeau Offline
connoisseur

Registered: 08/27/07
Posts: 3400
Loc: Laval, Quebec, Canada
I assume you tried loosening the ground screw at the back of your sub?
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#280465 - 11/25/09 08:16 AM Re: EP500 HUM [Re: EFalardeau]
SirQuack Offline
shareholder in the making

Registered: 01/29/04
Posts: 13579
Loc: Iowa
do the newer 500's even have a ground screw anymore? Unless the sub is picking up some type of interference from something nearby, although unlikely, it still sounds like the amp itself, if the power chord is the only thing plugged in to the sub when it makes the noise.
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#280466 - 11/25/09 08:16 AM Re: EP500 HUM [Re: EFalardeau]
Reddragon Offline
enthusiast

Registered: 02/21/09
Posts: 33
Hi EFalardeau, yes I tried loosening the ground screw with no change.
Thanks for your suggestion.

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