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Paul S wrote:

Dirty ground effects have remained a problem for me even with a special ground dedicated to my system, and I believe this is caused by varying ground potential and also inter-component "cross-talk" via the AC lines.  I have been able to change and even lessen audible-frequency noise, etc. by playing with ground; but I would like to hear from someone who has +/- tamed the cross-talk-type noise and shifting-ground pollution.

Paul, this subject has popped up multiple times but absolutely disagree with it. There is no problem with noise ground in audio as anyone who has any basic understanding of subject and a pair of ears does disconnect playback form main ground. I never have seen a playback that trying to fight with electricity and who still use the wall’s ground.

buzz wrote:

I haven't read this entire huge thread, so pardon my intrusion. I was wondering if you have tried to regenerate 120v by turning a motor by the shaft of another motor. We use that little trick in the commercial electric industry to generate 3 phase power when only single phase is available. The wave-form that I've seen generated really depends upon the quality of the converted motor used as a generator. But without looking critically at it, it seemed to be a perfect sine. (Good enough for industrial 3 phase, which isn't saying much)

Yes, BuZz, other and I talked about the motor-generators, in fact this direction is something that I am mildly pursuing now. Living in center city it is not as simple as you understand as those units are noisy. Still, there is a fairly small rotational frequency converts that I might try to adopt for my needs.

The biggest problem with rotational mechanical regeneration devises is that they will all sound different and it is not easy to explore which one will be “good for sound”. You can’t talk with sales reps about sonic quality of the motor-generators and you will never figure out from their specifications what is important. Furthermore it is not a satiation that you can go to a store and have 20 motor-generators and you can pick one that sounds right. This is no sonic trial for those things….

I hope sometime a person who do audio and who work with those motor-generators would do a some own research and come up with observations or recommendations, perhaps starting own company selling home-adopted audio-rated motor-generators. Here is a British 220V phase converter that drives 3-phase generator with switching capacitors.

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