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In Reply to: Anti-cables speaker wire is causing radio station interference. posted by hukkfinn on April 3, 2007 at 10:22:41:
My reading on this subject suggests that speaker cables are an unlikely source of RFI.More likely it appears, is that the IC's are allowing RFI.
Follow Ups:
for strong RF signals that "break through" and are audible on your audio system. Power amps are not designed to block RF that enters through their output terminals, and the stray capacitances and inductances inside allow RF to go anywhere it pleases.The way to resolve this problem is to start with the amp connected to the speaker and no input cables. Do you hear the radio station? If not, the speaker cables are OK. If you do, experiment with the speaker cables, and be sure you have clean connections at both ends. Dirty or corroded connections act as rectifiers for RF. Some speakers are excellent radio antennas in themselves.
Proceed to add the interconnect cables and repeat the test. Work your way back upstream until you identify the component or set of cables that are allowing the RF to get in.
Even though you eliminate breakthrough, the strong RF field in your house will create problems with your audio signal. You have my sympathy, because it will take a lot of work to remove the effects of the RF.
With my situation its definitely the speaker cables. Since i can flip back & forth between sp cables or IC's to do the same thing i threw in an anti-IC as well. its as quiet as the Blue Jeans cable LC-1. there's no way i can/want to buy a 10' pair of anti-IC's though!!
If you figure this out please let us know...asking paul speltz might help too.
It absolutely could be the interconnects, but it is would be faulty to conclude that speaker cables cannot be responsible for RFI problems. The ability for speaker cables to act as antennae for RFI garbage that is then rectified into audible noise by your amplifier has been well documented by many including the American Radio Relay League.However, if you twisted/braided the speaker cables with NO effect, then they may not be your problem. The suggestion of running a couple coils of each wire through an inductor put forth in the previous post would almost certainly eliminate any RFI interference that existed on your speaker cables. Of course, once this test had been done to verify the noise source, I would recommend removing the inductor for sound quality purposes.
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