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In Reply to: RE: Speaker wire length for correct maggie placement? posted by Davey on November 06, 2015 at 18:51:30
Is it possible to hear any difference in the music when cables are deliberately exposed to electromagnetic radiation/dielectric effect? In the example of the 'Bell' phenomenon, are you comparing effects brought about within hundreds, if not thousands of feet of external cables to the 2 or twenty feet of loudspeaker cable within someone's home?
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When you say "difference in music" the conclusion is subjective, and I can't answer that one.However, the twisted pair scheme is sound and will certainly work in reduction of EMI pickup.
Construct an unshielded parallel interconnect a meter or two long and attach between preamp and power amp, and listen (no music playing) for 60Hz hum pickup. Then twist that interconnect and repeat. You will notice an audible reduction in 60Hz hum pickup.
Admittedly a worst-case scenario/experiment, but it's a practical proof of the theory.Dave.
Edits: 11/07/15
I believe that whenever I had used some crappy (long) interconnects, I've performed your "worst-case scenario/experiment", and my Tympanis never hummed. I almost always listen to them right after firing up the system and before any music begins. (I'd particularly be interested in verifying that my tonearm is still grounded.)
That's good. It means you don't have many 60Hz fields roaming around near your gear. Also, your preamp probably has a low source resistance which helps as well.
As Josh mentioned, power amplifier to speaker connections are obviously much less prone to pick up of EMI/RFI than line-level connections. Although there can be issues at high level as well. This is what spawned the whole "choke tweak" evolution a few years back. :)
Checking your tonearm should be easy. Unless it's non-metallic or anodized or some other complication that prevents a continuity check.
Dave.
Audible interference from EMI/RFI pickup in speaker cables is very rare, but it can happen, forex near a transmitter. Other problems are possible if RFI gets back into the power amp's feedback loop, I read a paper on that in the AES Journal more years ago than I care to remember. I think this is it but I don't want to spend 5 bucks to find out!
http://www.aes.org/e-lib/browse.cfm?elib=10294
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