When I use the auto mode for phase tune, my P12 shows -5 but my New P20 shows 0, it really doesn’t feel like there should be much difference between the devices… How is that possible? is there something wrong with my new P20 ?? Firmware Bug ??
On both units run autotune a number of times. You will get different results each time. This will be true with both the P12 P 20 P15. I do this than manual set the average. You can closely watch the harmonic distortion out and find out what is the best setting too!
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“Phase Tune” adjusts the time relationship (phase) between the incoming voltage waveform and the regenerated waveform. With the Power Plant Premier and earlier P5 and P10, this was fixed. The fixed setting works quite well in most cases. However we found there are a few places (for example Long Island) that had unusually high distortion, and this distortion had a very substantial time lag (phase shift) relative to the fundamental. In these situations, with the default setting, the Power Plant didn’t perform as well as it could. We worked closely with these customers to develop custom code that would help their situation.
Since there are no doubt others who could benefit from this work, (and also because maintaining non-standard code bases for a select few customers is a logistical nightmare) we decided to include this as a feature in all new releases.
99% of the time, the default setting (0) is appropriate and no adjustment is necessary. If your Power Plant is consistently delivering less than 0.5% distortion (THD) in Sine mode, you should not need to make any adjustments. Below are the conditions under which you might want to adjust this setting:
1) Your power from the utility has extremely high distortion, over about 8%.
2) Your power from the utility is typically more than 10V (15V for 230V models) away from your desired output setting.
3) Your Power Plant is not able to reduce the incoming distortion by a factor of 10. In other words, if your THD In reading is 8.0%, and your THD Out is 0.5%, your Power Plant is performing well. If your THD Out reading is 1.0% you may benefit from adjusting the Phase Tune.
Please keep in mind that the Power Plant is correcting both THD and voltage errors. If your incoming voltage is within a few volts of the output setting, your Power Plant will be able to devote most of its capability to correcting the distortion. If the voltage is 10 volts or more away from the setting, the Power Plant is not going to be able to correct the THD as well. So if your utility voltage is more than 10V off, and you are seeing your THD reduced by only a factor of 5, this is probably normal.
The procedure for setting the Phase Tune is simple. Experiment with different Phase Tune settings and see what setting gives you the lowest output THD reading. The optimum setting depends on how much distortion is on your power and what it looks like. Unfortunately there is no way to predict what it will be.
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I know it can differ a little each time when you use auto tune, what i find strange is that my P20 always gives 0 at some point i got 1 but my P12 always gives a negative value between -4 to -6. shouldn’t both units give roughly the same values? my incoming phase is the same. I prefer value 0 as it sounds best to me. But as I wrote before, I’m confused that it differs between the devices, it shouldn’t in my opinion, it should be similar results on both. is that how they are calibrated from the factory or something else? i just want to make sure my new P20 is working as it should 100%
I am fully aware of how phase tune works and that in most cases you don’t need to use the function, but as I wrote before, I don’t think it should be different between the devices, they both measure the same thing but get different results…it feels strange, really
In each case are you getting the lowest THD output? Everything sounds good?
If so I would give it no further thought.
Yes, everything sounds fine😀
And the THD out is 0.1 so that’s good!
maybe it’s that the P20 is so much better than the P12 so it gets a lower value when using auto adjust. since everything seems to be working and sounds good, i should let this go.
I think it sounds best with the display turned off.
Yes, M2!
I also always turn off all displays on all my devices, and use HiFi fuse to.