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EP500 HUM
#280443 11/25/09 07:26 AM
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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.

Re: EP500 HUM
Reddragon #280445 11/25/09 07:30 AM
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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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Re: EP500 HUM
Ken.C #280449 11/25/09 07:42 AM
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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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Re: EP500 HUM
Ken.C #280451 11/25/09 08:04 AM
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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

Re: EP500 HUM
jakewash #280452 11/25/09 08:11 AM
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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.

Re: EP500 HUM
Reddragon #280454 11/25/09 09:52 AM
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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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Re: EP500 HUM
JohnK #280456 11/25/09 12:03 PM
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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.

Re: EP500 HUM
Reddragon #280463 11/25/09 12:58 PM
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I assume you tried loosening the ground screw at the back of your sub?


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Re: EP500 HUM
EFalardeau #280465 11/25/09 01:16 PM
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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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Re: EP500 HUM
EFalardeau #280466 11/25/09 01:16 PM
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Hi EFalardeau, yes I tried loosening the ground screw with no change.
Thanks for your suggestion.

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