Single P20 or a pair of P10's to power amps?

I own a P20 I use to power a pair of PSA BHK 300’s. I was curious if Im better off with a pair of P10’s to power the amps? Anyone have direct experience? Paul? Thoughts?

No. The 20 is better.


Oh, by all means, a single P20 would be the answer. The P20 is a much better sounding regenerator because of its lower impedance.


Thank you

And following your doubt, then I ask: to feed a PS Audio system (M1200s, BHK Preamp, DAC Sr, PST and SPP with a TT) is better 2 P12 (I already have) or a single P15 (no room for P20 unfortunately)?
And if there is a difference, why?
Thank you @Paul

I use one P20 for my system but it is or isn’t enough depending on how I use my system. With two M40 HV mono amps that are 550 watts each into eight-ohm, it isn’t enough for full output if I use it like that.

But, when look at the duty cycle of use, I’m seldom past 50% VA delivery at as much as I feed the Enterprise, and Scotty isn’t being asked for more by the amps and all the rest of the system at an 85 dB nominal SPL. If I was pushing near 80% or more of the P20 VA capacity, I’d consider another separate 20A outlet be installed and get another P20. Same system, but two different use patterns.

I did have a P10, but I was taxing it too much on average with the new amps if I use class A mode, so I upped to the P20 and re looked at the VA delivery and I’m OK with 50%-60% nominal total P20 VA delivery. But, that maxes out the P10 (below).


20A line = 20A * 120V = 2400VA @ 100% efficiency.
15A line = 15A * 120V = 1800VA @ 100% efficiency.

You need a 20A line to reach full output from ONE P20. A 15A line can be used with ONE P10 or P15, not two on the same circuit for full output. A 20A line can JUST do two P10 or P15 but not quite, A P10 or P15 isn’t 100% efficient and you need that overhead to reach full capability.

Not knowing your usage can make this a hard question to answer but I’d go with the actual usuage data and if you are around 50-60% or so of max VA, keep the one unit. If you exceed that, get two but…you need to use a separate leg to feed each one or you’ll really be no better off than before as the line VA maximum is a bottleneck. A regenerator can’t create double the power from the same line feeding a second unit. A 20A line can’t feed more than 20A*120V = 2400VA at 100% efficiency.

So it isn’t jusy one or two, it is also TWO separate circuits to feed each one if you do tax a single unit past a 75% VA average.



Good advice.