Author Topic: Unbalanced audio wire inductance question.  (Read 206 times)

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Offline drewt86

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Unbalanced audio wire inductance question.
« on: December 07, 2017, 11:59:46 am »
I'm getting my Uncle a 70V amplifier system for Christmas to install in his home. I'll be doing the installation myself. I ordered normal low impedance speakers and purchased the transformers separately. As I was laying out the materials, I considered a little thought experiment. It occurred to me that I have seen instances where wires inside tube amplifiers are tightly wound to increase their inductance and help minimize noise induced in the cables. So I have a hypothetical question that I'm hoping someone could confirm my guesses.

Would there be any benefit in this installation to tightly wrapping the wires coming off of the transformer to increase their inductance and shield against EMI or RFI? Would there be a significant sonic disadvantage or would it have little effect at all with only 8 inches of wire? My initial assumption is that it would negatively impact the AC audio coming thru the cable by creating an HF filter. But I thought, as well, that it could minimize 60hz being induced into the cables. It is a concern as the speakers will be installed in the ceiling and in close proximity to electrical fixtures and line wires. Interested to hear some thoughts form the community.

Online Brumby

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Re: Unbalanced audio wire inductance question.
« Reply #1 on: December 07, 2017, 12:30:15 pm »
If you're going to use a 70V system, you aren't looking for audiophile quality.  The signal is already running through step-up and step-down transformers, so a little more inductance isn't going to make a noticeable difference (IMHO).

I'm not sure how much effect it might have on EMI/RFI either.  I suspect not a lot.  I would be more inclined to put a twist in the cable, keep it away from mains as much as possible - and when you did have to cross a mains cable, do it at right angles.
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