AC Power Filter Power Conditioner - WAudio AC Power Purifier with Surge Protector, Black

I think I have never written a review before. If you are on the fence about this product don’t be. The quality is fantastic. This power conditioner and good cables enhance the audio in your system. It is not snake oil! Filtered AC does in fact make an improvement.I would put this up against any conditioner I have seen up to and perhaps beyond the $1000.00 mark.For me it added clarity, widened the stereo field and made the silence pitch black.I ended up buying three of these. One for my headphone setup upstairs and two for my stereo in the living room.This is of great value for the money.I also added an upgraded power cable to connect it to the wall but when compared to the one that comes with this I heard no difference.Highly recommended!!!

I’m going to combine one review for two items, because they are related, and so I don’t have to write two separate reviews: 1) iFi Power Supply 2) WAudio W3900 Power Conditioner... After the usual audiophile tweaks to my mid-low system (Teac CD transport, SMSL DAC, Schiit Freya+, Parasound Power Amp, Focal Chorus), I decided to try some some power supply tweaks—knowing that it could improve sound, or could be snake oil.The iFi power supply arrived first, so before installing this, I played and listened to one of my favorite test tracks, then plugged in the Power Supply to my DAC... Lo and behold, the difference was significant, and I could easily hear that the low end became much more meaty and solid. I was surprised what an improvement there was! I couldn’t tell any high end difference, which was fine, as I feel my system was a bit top heavy (bright) anyways, so this change went in the correct direction.A few days later, the W3900 came in. I listened again to my test track again, then unplugged my entire system from a cheap surge protector, and plugged everything into the conditioner. Surprise: Again, the difference was not subtle. This time, the conditioner effected the sound in a different way. It focused all the sound instrument more coherently, causing a major improvement in imaging. It seemed to do this by clearing out what seemed like some low level music details that was scatttered/floating over the entire sound stage... leaving the music very clean, and focused positioning of the musical instruments within the stage... So both experiments turned out great! Then I decided to test out what a YouTube reviewer said about power conditioners being inherent “current limiters”, and hence will hurt power amplifier performance. So I selectively unplugged my power amp from the conditioner’s “filtered” section, and plugged it into the “unfiltered” section... BOOM, the music went less focused again! So, done, all my components will go through the conditioner’s filtered outlets. I’m a happy camper.My conclusion is that power supply tweaks are NOT snake oil with the following caveats: 1) That your speakers or room acoustics are not max’ed out—and still have the extra capacity to reveal any improvement tweaks. For instance, if your room acoustics are so bad that even if you improve real sound quality, the room has no capacity to reveal the improvement... then no matter how real the sound improvement you achieve, it will not show up in a room with bad acoustics. (In my experience, the two most important and significant sound tweaks are speak placement, and room acoustic treatments. After you get these two items settled, then go on to the smaller tweaks like cables, power supply, etc. 2) The second circumstance when a power supply tweak won’t show is if your system is super high-end and already optimized to the max. In this case, a small change in power supply will have no noticeable effect, and may even degrade the sound somewhat.... Other than these two conditions, I think you will have great results and fun playing with these power supply tweaks!

Little to no info online, so I'll share what I've found. Quality construction and does what it says on the tin. Once I worked out some kinks (see below) I noticed a significantly lower noise floor between mic, interface, and cans. That being said, it had some weeeeiiiird kinks, and I had to try about 4 different combinations of how I plugged in my computer, USB hubs, audio interface, lamp, and external HDD enclosure. Before I got it right, really strange things were happening to my audio. I've no idea why. Nothing in my prior experience or knowledge explains why the sound would start to smear out over time, like jam spread slowly over toast.The lower noise floor I cannot scientifically attribute to the unit alone, as I took the opportunity to re-route all my power cables away from all my audio and video cables, whereas before they all disappeared down the same hole in my desk. Cable management is SO satisfying when done well, is it not? Anyhow, ymmv. I also don't know how the phase indicator is supposed to work. Mine is lit, but it looks half-lit, so my gut tells me that means it's getting a signal that's both in and out of phase, but moving things around didn't change that. I probably should've mounted it the other way round, or not so close to the underside of the desk, but until I know for sure I'll stick with what's working. I think a clue I found on the Asian version is to make sure to use enough of the filtered outlets. At first I thought I'd save them for something special, but usb3 generates a lot of noise (look it up) and I'm still repairing my hafler so no hifi review at this time.