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In Reply to: RE: What? posted by Russ57 on August 15, 2014 at 15:35:35
My formula, corrected, is correct.
And we said the SAME thing….about what is larger, VA or Watts.
Now, I use a Kill-A-Watt meter. Cheap, fast, easy and does NOT distinguish between displacement PF and Distortion PF. Accuracy? Who knows? Repeatability? Also who knows? It DOES seem reasonably repeatable when measuring the same device many times over several weeks.
I posted a paper from the EU about PF and its measure and the mandate for PFC on many devices. A few exceptions were made, but they talked a LOT about DPF (distortion PF).
My original question still stands, however, if you have a Non-Resistive load (PF<1) and you apply external PFC, do Watts to UP or does VA come DOWN? If VA comes down, you are ahead, If Watts goes UP, you might make your 'strain' on the power grid somewhat less, but are not really ahead from an actual power use viewpoint. In either case, the power grid is slightly better off.
And from our FWIW department, since you are both interested and knowledable, here is a link to a neat way to measure amplifier power. They measure at several fixed impedances AND from Inductive to Reactive at several points. The final 'graph' is very descriptive of an amps performance when things get weird. Not the audio graph link, but close enough.
Too much is never enough
Follow Ups:
if you have a Non-Resistive load (PF <1) and you apply external PFC, do Watts to UP or does VA come DOWN?
Volt amps goes down. Current is used more efficently. That is what the power company cares about and why they charge for poor power factor.
Ok, good.
Now, for those who can test such things, would such PFC effect the sound from the amp? Better? Worse? or perhaps just 'different'?
I think most audiophiles could care less about the electric bill, especially those fans of pure class 'a' or 'high bias' designs like Pass and a few others.
Too much is never enough
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