AVS Forum Special Member
Join Date: Feb 2007
Location: Lawrenceville, GA
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I'll try and keep this as short as possible. I have a HSU Research VTF-2 MK 3 sub and have been using it for about 3 to 3-1/2 years now. I just bought a house and got a true media room setup with 7.1 audio and projector. After about 3 weeks of using this new setup (which can be viewed in my sig) my subwoofer started a very noticeable hum. I called HSU research and they walked me through some troubleshooting steps. They thought it was the RCA cable first, so I replaced it and the humming continued. I replaced my Onkyo TX-NR808 receiver thinking that was the problem and that didn't fix it either.
I bought a Denon AVR-2313CI. so here's what I noticed. I have my XBOX 360, Desktop PC, PS3, WiiU, DirectTV and Denon projector hooked up to the receiver. If I unplug all hdmi cables going in, the hum stops. The only two devices that cause the hum are the DirectTv box and projector. I thought maybe the hdmi cables they were using were bad and tried a different HDMI and it still happened.
I thought maybe it had to do with the electrical so I tried something else. Please note that the subwoofer is only 2 prongs with no ground. I unhooked all hdmi cables to the Reciever and plugged the Subwoofer into a surge protector. When I tried to plug in the DirectTv box HDMI cable in the back of the Reciever to see if the hum started up again, the receiver sparked before I got the cord all the way in. So I took the sub back out of the surge protector and sat there thinking of what else I could try. I decided to move my subwoofer and plug it into a different outlet. With everything hooked back up and the subwoofer plugged into a different outlet, no humming at all. I thought the problem was solved until this morning. I was playing music on my surround setup and the dreaded hum came back again. As long as the sub is on and hooked to th receiver, it has a constant hum. I guess I can try a different sub, but I have a feeling that its not the problem. Maybe it is, but something tells me there's something electrical going on. Please, any help or advice would be appreciated. Thanks