This is a mains purifier.
One of its claims (supported elsewhere on the Internet) is the removal of DC offset. My mains has only 5mv DC offset so I cant make an informed comment.
Where I have found it amazing, is in cleaning the mains supply, particularly noise introduced by Switched Mode Power Supplies SMPS
Brief History
I have been into Hi Fi for over 50 years. My system has evolved over those years and as the system got better all the normal attributes of Hi fi improved.
About 5yrs ago I was able to set up a dedicated listening room, but ironically this is when I became aware of an underlying harshness (glare) to everything I listened to. So in a traditional fashion I changed bits of gear (mainly valve stuff), then interconnects and speaker cables, then treated the room with adsorbers and diffusers, then tackled component isolation. All the while I moved the system around the room to search out the best location. I even got my ears syringed in desparation
After all this time and effort, improvements to the Hi Fi were marked, but that slight glare still invaded all my listening, meaning my music sessions never went past 90 minutes. - Sad.
The Cure
Recently I became aware of the damage that SMPSs do to the quality of mains power, injecting high frequency mush back into the supply. A quick count up of my house revealed about 30 SMPSs not including my neighbours.
They were all invasive - 3 Alexas, 8 chargers, computers etc etc, even on one of my DACs and First Watt pre-amp.
As best I could, I turned off every SMPS and listened again. The improvement to the enjoyment of the music improved enough to justify the purchase of a Puritan PSM156
This was a revellation. My system now sounds fantastic and I listen for many hours without feeling the need to go and do something else.
Specifically music seem more real, more relaxing, more enjoyable. I see reviews elsewhere claiming more bass, better instrument separation etc, but I see it much more simply. Removing the MUSH has let the system breath
Attributes
1. Silences within music and between tracks are blacker. Sometimes it seems like the whole system has turned off.
2. With MUSH removed everything is better defined
3. With MUSH removed small detail is revealed. This shows itself at the boundaries of the soundstage meaning the soundstage itself is wider and deeper
4. I can plug my Hi Fi SMPS devices alongside everything else with no downsides
5. My system sounds the same no matter what else is turned on in the house or what time of day.
6. The cost is spread over 5 devices so its easier to pursuade yourself its good value
7. I have lots of experience and you will just have to trust me that spending this money on any other component(s) would have got nowhere near this improvement
Caveat
The Puritan PSM 156 takes several hours to burn in
It can be left powered on 24/7, consuming just 0.2W of electricity
This device worked for me in my system. Your mileage may vary.
