How much mains power THD is bad?

Newbie question. I know that THD > 1% in music is around the area where it becomes audible (at least for me).

But what level of THD in the incoming power is audible on the output music? A general answer of course assuming one has very good audio equipment. I know that there answer depends on the amplifier and speakers etc.

My mains power seems to have around 3.5% THD.


It depends on how much your devices are affected by the % of distortion or not and then whether or not you hear the difference or not. Many variables.

I think the Power Plant real selling point is the reduced impedance and less so the reduction in THD.

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Incoming THD of 3.5% is pretty typical.

Once can hear the difference between this and the output of a PowerPlant. The voltage regulation provided by a PowerPlant is also audible.

But keep in mind these are not immediate OMG I can’t believe differences, at least for me. I found that the improvements of using a PowerPlant sneaked up on me where I suddenly realized how relaxed the sound is, the improved instrumental timbre, how small expressive uses of dynamics where more audible, etc.

Enjoy your new beast.

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I to feel like the difference in audible improvements using a power plant are very subtle. They are so small I wonder if it’s bias that makes us believe we hearing a difference. It would be a fun to do a blind test to determine if we actually can tell the difference between having a power plant or not.

I would find a blind test easy as I would between very good cables v. basic cables.

The trick is to listen for a good while, become accustomed to the sound, and then take the PowerPlant out (a good deal of work unfortunately). I expect most would greatly miss having the PowerPlant in the system. If you don’t, send it back! :slight_smile:

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My power plants both made immediate and substantial improvements (incoming THD 4%), but upgrading the fuses made a much larger impact.

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My incoming thd has varied from 2% up to 6%…my power plants have handled it all with aplomb.
My outgoing thd from my P15 is .1%.

Having gone from P5 with spectacular results to P12 even better results to P15 even
better results…

Upgrading my former P12’s fuse yielded another very wonderful improvement in sq.

What I don’t understand is how people could experience little to no
improvements in sq with their power plants…

Best wishes

@davida, Why does the fuse upgrade improve SQ?

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The difference can be heard for me having just a 1.8 % incoming power. Want more improvement change the power cord from stock cord to a better upgraded audiophile cord into the power plant v

Get a power plant or power plants that will let you run your whole system at the volume you listen at. With me using power plants that volume could be decreased due to ability of details to jump out at lower levels.Though I still like music more at louder levels of the pre PP past. My amps show wattage so 12 watts is best to not overload the room. Same level of detail now can be heard at 5 or 6. wattsor less easily filling the room and still feeling bass. If I really wish to impress others or enjoy I will push it to 12 watts rarely theses days. Great investment

Hey shankha…the reason upgraded fuses improve sound is
their lower resitance. The fuse is the gatekeeper
for incoming current…improving the flow makes for
a very nice appreciable improvement.

Music is highly dynamic requiring
tremendous instant current…If this
impedance can be reduced the quicker and more easily
associated equipment can accomodate these changes.

Think of it this way…a stock engine vs same engine equipped
with high flow upper and lower intakes and a free flowing
tuned exhaust…the engined with the upraded intake and exhaust
systems will be far more responsive than the same engine in stock trim.

Hope this helps

Best wishes

Shankha…forgot to ask which regenerator are you using?

Well stated Elk.

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My THD is between around 0,8% to 1,5%
I’ve never seen a THD over 1,7% and my P15 is happy with that.
I live in the deep woods in northern Sweden so I don’t have much that pollute my AC.

Interesting how PS audio reports THD differently for the P12 versus P3.

It’s almost like it set up in a way which makes compare the 12 to the 3 less direct.

P3 THD<.3%
P12 THD is reported as resistive and reactive loads.
**Resistive <.5%, Reactive <.05% (.01% typical)

@davida, p20.

I share my service entrance secondary with 3 neighbors who have solar panels.
My area of the country is geographically challenged when compared to the sun belt.
Add to that the panels are on 3 different roof surfaces facing different directions.
The inverter outputs are cleanest when there is a lot of good sunlight, maybe 10% of the time.
The other 90% their efficiency is pretty low and my THD can be as high as 8%, mostly around 6%.
My humble P3 Power Plant struggles to get the THD down too .5% during the day.
Sometimes at night I can get down too .3%
And yes, you can hear the difference.

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