Audioblazer: Most systems probably never draw more than about half of 15 amps from the wall. Some folks do think 20-amp IEC connectors sound better than 15-amp ones, but that's supposedly due to the physical construction of the contacts rather than the amperage rating per se. Either type of connector has a survivability rating higher than its nominal rating (double I think?), but also keep in mind that 20-amp terminated cords and 15-amp terminated cords are in almost all cases actually the same *cords* -- normally only the connectors differ. Anyhow, there's no way one could judge conditioner A to be "better" than conditioner B just because conditioner A uses a 20-amp IEC plug. The EP15A (active) and the Hydra (passive) are very different kinds of devices -- which inlet connectors they use is probably the least of those differences.
Stereo_phile: I'm wondering how you know your P3 was "straining"? Not disputing that you say the fan came on (not that I knew this unit even had a fan) -- or that you find the BPT to sound better in any case -- but if the fan running was the only 'symptom' as it were, isn't it possible that your P3 was working exactly as intended? (Was it located inside an enclosed cabinet?) After all, this is a unit that's rated to supply power amps plus sources. I find it pretty incredible that it should have had any difficulty whatsoever powering the items you plugged into it, provided your unit wasn't somehow broken.
Stereo_phile: I'm wondering how you know your P3 was "straining"? Not disputing that you say the fan came on (not that I knew this unit even had a fan) -- or that you find the BPT to sound better in any case -- but if the fan running was the only 'symptom' as it were, isn't it possible that your P3 was working exactly as intended? (Was it located inside an enclosed cabinet?) After all, this is a unit that's rated to supply power amps plus sources. I find it pretty incredible that it should have had any difficulty whatsoever powering the items you plugged into it, provided your unit wasn't somehow broken.