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Antonio J. wrote:

… looking like the Kemp's unit. But that's provided the input electricity is still under 5% of distortion. They also state that that performance is under linear load, so it might be possible that using chokes or trannies loading it would change performance for the worse.

It is absolutely irrelevant how regenerators work again resistive load – it never will see resistive load.

Anyhow, I would like to make a few general comments about APS and APS-like regenerators. As I understand ASP unit derives from commercial wildly available class “On-line” regenerators. There are literally dozens brands and hundred model out there. The prices wary from many factors, with power rating being a major factor. Generally commercial UPS units of 1050W (as APS is rated) range from $450 to $1550, the bigger name and the more features make higher price. Interning is that the guts of ALL those unit are absolutely identical and most likely the all brands are being produces by 3-4 Chinese sweatshops and then juts re-branded by final “manufacturers”. The APS unit that I dealt with is in the very same boat – is a generic commercial UPS unit juts slightly optimized for audio applications.

What dose it means “optimized for audio applications”? Perhaps some parts changed, perhaps heavier EMI filtration, less noisy operation and deactivated alarms. It does not sound as a lot but in realty there is (or might be) much more. You might go over many different UPS units and you will confirm that they all “sound” different and not necessary correct and according to my own attempts not appropriate at all.  Now let for a second forget about ASP double or triple price and think about what should be though – about Sound. The entire idea to buy a regenerator from APS, PS Audio, Acuphase, Kemp and other is because thy have allegedly conducted the research and evaluations and by nature of own reputation they assure the correct Sonic performance of their products. The Lamm ML2.0 has pars and labor that has no more value then Cary, Conrad Johnson or Audio Research but if you experienced and understand the sonic distinctions between Cary SET and Lamm SET then the ridicules price difference between of Lamms and Carys become quite logical.

So, my point is that I do not care if one or other company trade their regenerators and that I might get the same or near the same cheaper somewhere else. There is many Class AB power regenerators that are being use in medical industry and they are way cheaper then PS Audio units. Still the whole point to deal with companies like PS Audio and APS is because they underwrite (or at least suppose to underwrite) the Sonic Results. Unfortunately, so far, PS Audio and APS do not assure Sonic Results at more serious level then credulous and naive demands of audio “weekend boater”…

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