Seems like you should ask Pass Labs. Whenever I've talked to manufacturers they have been very friendly and helpful.
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The only thing that makes any sense to me is-- that Pass must think most active power conditioners cannot supply the instaneous power the amp pulls with dynamic peaks. It dosen't make a lot of sense since most "audiophile" power regenerators are built to supply power amps as well as other less demanding components. Did you ask Pass?
The concern would be the abiltiy of the power conditioner to keep up with the current demands of the ampllifer. Reduced current not a problem that's going to cause damage to your int amp so the question is what affect will it have on sound. That is a question that only you will be able to anwer by listening to your system with and without the power conditioner.
My wall power sucks...and it's a modern house. I need to see how much it would cost to get dedicated lines. Does Pass assume the wall power is always good? Regenerators seem like a good idea but they are SO damn expensive...I'm using a PS Audio power port ac outlet and my trusty Adcom ACE 515 and getting away with it so far.
This answer was received from Pass Labs........
The PS Audio re-generators seem to be fine, especially with the multi-wave setting options. Cannot say for a fact that the multi-wave is better, but it is different in a pleasant way. Long story short the PS Audio products do not seem to bring anything ill to the table.
Some back ground: The power amps have for many years been built with tuned noise rejection circuits ahead of the transformers in anticipation of legislation that deals with noise on power lines.
These tuned circuits frequently do not benefit from added reactance that many passive aftermarket noise canceling products provide. The do no physical harm, but in general do not serve the music.
It has proved most prudent to answer these questions on a one on one basis.
04-09-12: DarkkeysInteresting! I had a PPP and found it doesn't work with my tube monos rated @650Va per mono. Theortically it should work ... The PPP would heat up and fan screaming loud. Out of couriousity, I borrowed a 2nd PPP and plug each mono to a PPP and the same heating up / fan result.
I've had many PS Audio products and found PPP their best effort but there are superior alternatives in the market. In general, I found active PC alters the sound and the sound sounds processed. Finally settled on a passive unit with 2 dedicated 20 amp lines that restores the natural tone without any current limiting problems.
The two reasons that Pass Labs recommends plugging directly into the wall are that (1) many power conditioners contain chokes that impede instantaneous current draw, thus hurting the resulting dynamics, and (2) many (all?) Pass amps have their own built in RF noise filtration.
I have had the X600.5 amps for several years and found that the Synergistic Research PowerCell 10SE to improve the sound greatly without hurting dynamics, while the Shunyata V-Ray did dull the sound somewhat. So it is case by case.
Dedicated lines did very little to the sound of my sound. Certainly far less than the Synergistic.