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cmattis's picture
Last seen: Never ago
Joined: Dec 5 2006 - 6:10am
Subwoofer - weird sound?

Here's my problem ... I've had a terrible RFI problem coming from my rear surround speakers. After a LOT of playing around with the system to try to figure where the "noise" is coming from, I've finally narrowed it down ... here is my problem - the subwoofer connection. I disconnected everything from the back of my receiver (an NAD), reconnected my components one by one, everything was working awesome, until .... I connected the subwoofer cable. I immediately heard the radio signal (the RFI) in my rear channel speakers as soon as I connected the subwoofer cable. I didn't even have it connected to the subwoofer ... it was just a loose cable connected to the back of my receiver (I still had the problem, by the way, when it was connected to the subwoofer). What's going on? Is it the "subwoofer connection" on my receiver? Thanks.

Spirit's picture
Last seen: Never ago
Joined: Jan 3 2010 - 1:58pm
Re: Subwoofer - weird sound?

My sub is wired with a phono, I went out to Maplins and bought a sheilded pair, try that mate.

mrlowry's picture
Last seen: 6 years 2 months ago
Joined: May 30 2006 - 1:37pm
Re: Subwoofer - weird sound?

It sounds like you do need a better shielded sub cable.

cyclebrain's picture
Last seen: 4 months 2 days ago
Joined: Jun 16 2006 - 11:40pm
Re: Subwoofer - weird sound?

If I understand your problem correctly, your speaker cable to your sub is picking up a radio station signal and somehow allows the signal to travel backwards through the sub amp and then be routed through only the two rear channel amplifiers to the rear speakers. Oh yea there is also the question of how the RF signal gets converted from RF to audio frequency. Is this an AM or FM conversion? I know that this stuff does happen, but it takes so many things to be in alignment to work, that the odds are so much against it happening. So Cool.

rvance's picture
Last seen: 9 years 9 months ago
Joined: Sep 8 2007 - 9:58am
Re: Subwoofer - weird sound?

I had an extremely baffling ground loop hum in my subwoofer connection years ago. It actually traced back to my cable tv connection which was on the same wall. It took me several frustrating months of complaints to get Charter Cable to send an actual technician (not an installer) to check it out. The installers were all telling me it was my equipment, but I knew better. The tech found that the run to the power line was too long, causing the hum. They ran it on a shorter path to a ground rod under the power meter, then to the wall. Solved the problem.

This may not be relevant to your situation, but the tech told me it is almost never the equipment, but usually some bad ground source/connection that causes the problem.

Good luck!

RGibran's picture
Last seen: 1 year 6 months ago
Joined: Oct 11 2005 - 5:50pm
Re: Subwoofer - weird sound?

Where were you on February 25, 2007 ?

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