I am always amazed how bad my incoming AC is. But I am equally amazed how well the P20 does it’s job.
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Dang. At least your incoming is usually hovering around 4-6%. But that 8% spike is pretty crazy!
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Pretty amazing.
Wow! Where are you getting that crappy power from? Must of been a big squirrel that got electrocuted on that 8% spike!
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This is a week ago and not oneupmanship but I may wear the distortion crown.
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What would a system sound like with raw 9% THD?
Hard to answer as I have made system improvements along with an early P20 purchase. The incoming line distortion has always been in the
7 to 8% range. I compared a P15 to a Shunyata Delta at the time and liked both for different reasons. The P20 was a notch above both.
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I asked because I have not experienced such high THD. I’m so lucky with incoming THD between 0.5% and 0.7%
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Let’s not forget unless the P20 has an AFE (active front end) it is causing some of the incoming distortion. Can’t say how much but from professional experience typical rectifier/filter front ends introduce a not insubstantial amount of harmonic distortion due to the way they convert AC to DC. This is highly dependent on other loads, impedances, etc. Not slamming the product just adding some perspective. Would be very interested to see what your incoming THD number is without the P20 in the circuit (would also get worse as the load on the P20 increases).
EDIT: A simple experiment would be to compare incoming THD with no load (all components plugged in to P20 turned off) and with typical and maximum load. Very curious.
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I live in a suburb of Chicago, Orland Park, and the power comes from ComEd. Prior to my P20 purchase I had an Audioquest Niagra 5000 ( I think that was the model number ) and it buzzed so loud I could hear it in the adjacent room. Drove me nuts. I replaced it with the P20 and all is quiet.
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Wow! That’s crazy. I’m in Grayslake a little over an hour north of you on Com Ed and I think I may of gone over 5% once. 3.5% is usually the worst.
I would contact your power company. They likely have some obligations to provide power within either accepted or mandated standards. Of course, first ensure your devices aren’t the cause of the distortion.
While the P20 resolves the issue for your sound system all other electric devices are not living their most efficient nor longest life.
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Hi @brett66
The link takes me to a product page instead of the pdf file 
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Strange, this is what I see.
Here’s the text of the link, change dot to . Try this: www dot aptsources dot com/wp-content/uploads/pdfs/Total-Harmonic-Distortion-and-Effects-in-Electrical-Power-Systems.pdf
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Still the iPad sends me to their products page! I will check n PC later on.
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Thank you. I go right to the pdf file on my lap top.
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I am simple, how would I know if my devices are causing the distortion? Isn’t the distortion arriving before they get to my equipment?
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Both is occurring. I would start with turning off one breaker at a time and record the THD%.
Or vice versa. Turn them all off and on one at a time.
You may find your devices contribute very little or it may be quite a lot of the total.
Your nearest neighbors on the same transformer provides the rest.
Home breakers are not designed for many off/on cycles but once each is fine.
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In the post above, the P20 is loaded at less than 50%. However, the incoming THD is around 9%. In my case, when I load the P15 at about the same, my incoming THD remains below 1%
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