- Apr 18, 2022
I guess you've figured it out that I was the one who sent in the P12 to be tested. There were some power issues I had causing some weird feedback/noise that the P12 did help eliminate (maybe an off-label use, I don't know). Somewhere in my post history on one of these threads is a recording of the noise with my amp cranked to 11. From a quality standpoint, I don't think it makes me hear things in my music that wasn't there before. Honestly I found the biggest thing that makes my system sound better is my mood. A good mood makes music sound better than any device could possibly do.
My initial motivation was to see if maybe power was the cause of my noise issues. My house (and wiring) are old. I was also interested to see if perhaps it could help. The audio dealer where I bought my amp had a puritian conditioner he was showing me. We didn't listen to it, but he did have some little device that, when plugged into the wall, would make the noise in the power "audible" via a little speaker and he showed me the wall vs the puritan, and the puritan made the device make no sound at all. I thought maybe there is something to power conditioning. I saw the PS audio and thought their approach of "regeneration" was worth looking into.
I think what PS Audio charges new for the P12 is too high a price for what the thing does. I understand it is a niche device so they have to make their money back somehow since there are some expensive parts in it. I found a really good deal on a secondhand unit that looks essentially new to me. They offered a 30 day trial and I though $60 for shipping back if I don't like it would be worth my while. I ended up liking it enough to keep it.
My motivation for having it tested was that I found this website when looking for something else and I noticed the P12 (or any regnerator) wasn't tested. I figured I could use that $60 in shipping to test it for the world. I didn't really care about the outcome since I was already happy with my purchase, but the results were interesting and this discussion has been well worth it to me!
So in your case the P12 did improve the issue you were having with your system which I think is a win regardless if it could have been resolved in a different manner. I have no reason to think you are lying so we can mark a positive attribute for the P12 in that it can in fact help with certain problems whether they are ground loop related or possibly some other issue.
Hopefully you don't mind if I ask a few questions. If not just ignore me as you have zero obligation to satisfy my curiosity.
What amplifier had the feedback/noise issue? I have a lot of experience with commercial products up to high end less common audio products in both design and repair aspect. I may just be familiar with your specific amplifier or at least look at the schematic and see what's going on.
What speakers were you using?
What measure first did you try to remove the feedback/noise? For example did all amps you have do this? Did you try the amp from a different branch power circuit in your houses or a different home on a different grid or a standby generator etc.. Did you try plugging all devices into the same receptacle via power strip? Did you try passive/active DI (direct inject) boxes or audio grade signal isolation transformers? You get the idea.
I am just trying to paint a bigger picture in order to deduce possibly what was going on with your system and then possibly how the P12 corrected the issue. If we can track down the issue and the solution is inexpensive you may prefer to even sell the P12 and get your money back while using the other solution to solve the feedback/noise problem. The majority of times people have noise problems that ask for my assistance I need to figure out if something is defective or if it's just some ground loop noise related problem. I have seen people with other appliances on the same branch circuit that will pollute the branch with noise and effect system performance by audible noise. Other times I have heard the problem and immediately said the amp needs to come with me it needs repair. Whether it's 120Hz power supply noise from bad filters in the amp, 60Hz internal ground loops can even be lowered or with tube amps hum balance pots can be adjusted to reduce noise, feedback squeals are a stability problem where the amp either has parts that have drifted and or deteriorated in performance enough to cause the instability and I have even seen some amps come straight from the store brand new but wasn't designed great and rigorously tested with actual reactive loads to see if it remains stable. You'd be surprised how many just test on a purely resistive load and think all is well when our speakers are anything but purely resistive load especially Electrostatic speakers like Magnepan, I have seen them send an amplifiers into oscillation and end with fireworks that had poor phase margin.
Thanks for letting Amir test your gear and letting us gab about it endlessly especially where many including myself are talking so horribly about PSAudio and their products.