Ive just received a brand new P15 … and absolutely loving it! These do seem to be the devices you wish you had years ago.
I do however have a couple of questions regarding the accuracy or maths involved in the display details.
With everything all powered up … and no music playing … the VU meter shows just above 375 watts.
The details Status screen shows Power @ 316 watts. The % Load shows 31%.
Now 31% of 1500W (the P15 capacity) = 465 watts not 316 watts. ???
Confused about that one!!!
Any clues on these values (both the status and VU meter displays)?
While I don’t have an authoritative answer…Perhaps I could hazard a guess…from an experience
I had with my new P12.
My powwer amp is a Parasound A21 …with a rather large power suply, 100,000mfd caps.
While playing a Reference Recording of Aaron Copeland’s Fanfare for the Common Man,
allowing peaks into 92 ish db range… the power watt meter on P12 went from a normal useage
of about 220 watts to and after a thunderous tympani series of whacks…the power watt meter
jumped to 350 or so power useage 500 watts in P12 is halfaway point… as this penomenom took
place after the series of thunderous tympani attacks …I was puzzled …then I realized it had
to be the power caps in my A21’s power supply “drawing a refill” from the P12…this lasted for
a blink of the eye it was so quick and returns back to normal.
Perhaps the differences shown by your 2 P20s could be reflecting a similar phenomena.
Since I don’t know what you have plugged into your P20s I can’t say except to
share what I saw occur on my P12…
Even my own interpretation of what I experienced could be in error…
Hopefully a PS Audio expert will try to address this for us…
Thanks for your kind words, and interesting story.
Mine is nothing as dramatic as yours; simply two monoblocks, with several source components also plugged into each P20, all just idling with low decibel music.
There’s something not right about the math, as the relationship between the three electrical variable is simply Watts = Amp x Volts. Granted, there’s some efficiency loss during the regeneration, so if the voltage is fixed, one of the other variables may actually be higher (with a multiplier greater than 1.0). In my case, both voltage and wattage are nearly identical, so the calculation for “current” should also be nearly identical. However, there’s a discrepancy of 20%.
Hey John…it could be that a particular moment instant an amp was “replenishing itself
with go juice” even at low db levels…I have seen my system do that to the P12
but not at the same rate as I stated earlier. At low db leveks as well.
Perhaps it could be speaker load…speaker sensitivity and room size as well
Which speakers are you using?
Any subs plugged into a P20?
Apart from what I have covered I wouldn’t know, I’m just an enthusiastic file but not an ee.
Another thought shut everything down unplug both P20s from wall …then after a moment or 2
go plug P20s back in to wall but do not start amps as of yet wait for P20s to initialize…
against the normal order of things I restart sources 1st then power amp to protect P12
from alll the inrush of current at once…
Hey Paul M…if you happen on this would you please shed some light on this for us…
Your thought are most appreciated…thank you sir!!