I got asked so many times in so many places what I thought of PS Audio measurements of P12 that I thought I should do a video on it:
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Response to PS Audio on P12 PowerPlant Measurements (Video)
- Thread starter amirm
- Start date
DonR
Major Contributor
This poor deceased horse keeps getting beaten.
@amirm brought slides and plenty of passion for this takedown response. Regardless of all the hoopla and measurements, these devices don't pass the smell test of necessity. Maybe if you were running a 100k system off a generator for some reason. This category was created out of thin air to solve a problem that doesn't exist.
restorer-john
Grand Contributor
It's pretty clear the inbuilt THD analysis of the PS Audio P-12 powerplant is considerably better than you give it credit for. It is correctly displaying the notched-out residual under magnification, something completely unrelated to the number of pixels on the LCD. It's not an APX-555 and doesn't pretend to be. Take it for what it is.
The line regulation cannot be dismissed and it is trivial to demonstrate with any medium powered amplifier using a traditional linear (transformer/bridge/caps) that a lower supply voltage translates directly to a much lower output power. Also, line regulation serves to prolong the life of filter capacitors, incandescent dial/meter illumination and other components not sitting downstream from a regulator.
Most amplifiers of traditional design (the majority of amplifiers out there likely to use this product), have little to no regulation for their main high current supplies and not much more (other than a RC) for the front ends.
The simple fact of the matter is a low impedance, stable mains voltage supplying your gear is a good thing. PS Audio is supplying a product for sale that does that. That cannot be argued with and still retain credibility. You can choose to buy one or not, but this continual unwarranted attack on the man and the company is unbecoming.
Why not just let it go?
The line regulation cannot be dismissed and it is trivial to demonstrate with any medium powered amplifier using a traditional linear (transformer/bridge/caps) that a lower supply voltage translates directly to a much lower output power. Also, line regulation serves to prolong the life of filter capacitors, incandescent dial/meter illumination and other components not sitting downstream from a regulator.
Most amplifiers of traditional design (the majority of amplifiers out there likely to use this product), have little to no regulation for their main high current supplies and not much more (other than a RC) for the front ends.
The simple fact of the matter is a low impedance, stable mains voltage supplying your gear is a good thing. PS Audio is supplying a product for sale that does that. That cannot be argued with and still retain credibility. You can choose to buy one or not, but this continual unwarranted attack on the man and the company is unbecoming.
Why not just let it go?
Please refer to this post for some example calculations and notes.
OP
- Thread Starter
- #8
That is a two-way street. If your voltage is higher than it, you lose power by regulation.
OP
- Thread Starter
- #10
What about the P12 itself? You think your net MTBF is improved with a 1,300 watt linear amplifier whaling at mains frequencies? And to the tune of nearly $6,000? I could repair plenty of gear for that much money. Modern audio gear doesn't have dials and meter illumination that way anyway.
Amir you have deservedly every right to defend yourself and the membership against false prophets.
And it helps us not to fall in the pitfalls of scrupiless bussinessman with all their trickery up the sleeve. Thanks!
And it helps us not to fall in the pitfalls of scrupiless bussinessman with all their trickery up the sleeve. Thanks!
OP
- Thread Starter
- #13
That was my expectation before I hit play on his vide. Then I see two voltmeters and a dummy load....
OTOH doesn't surprise me.
Amir, my understanding of a PS Audio policy is that they will allow a previous customer to apply the full cost of their old equipment towards the purchase of new gear. You should trade in your old gear, get something new.... and measure it. 
OP
- Thread Starter
- #17
Now there is a thought! I wonder what they will give me for the P300.Amir, my understanding of a PS Audio policy is that they will allow a previous customer to apply the full cost of their old equipment towards the purchase of new gear. You should trade in your old gear, get something new.... and measure it.
Nango
Major Contributor
To Paul Smith, CEO PS Audio: You know what? I believe ASR.
charleski
Major Contributor
And the source impedance from the HC outputs is six times higher than running straight from the wall….
restorer-john
Grand Contributor
It isn't. It has been pointed out several times, the 'measured' 'impedance' is clearly in error. Do the math.
