Removing the 60 Hz hum was very nice by itself. But it also opened up the soundstage, clarified female voices, and made music, especially HDCD recordings, and Reference Recordings, much more enjoyable.

My turntable was picking up some AC line noise caused by a powerline network adapter running on the same circuit. Plugging this device into the first receptacle of my power distributor (ZeroSurge 8R15W-I, which by the way does nothing to attenuate line noise in my tests) greatly reduced the audible noise (I’d guess at least 10db).

I purchased this device based on a YouTube upload titled “iFi AC iPurifier review — PROOF that it works!” and I can confirm my result is similar to that shown in the video. A single AC iPurifier is not canceling ALL the powerline AC noise, but I’m impressed because truthfully I was expecting it to do nothing.

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Watch the full video here…

Excellent product. Lowers the noise floor so more detail can be heard in the music

Great product

Very fast delivery and above all the right product delivered!

Like many reviewers, I am also enthusiastic about the line filter.
I personally find many other line filter devices in hi-fi and high-end areas often very overpriced, since the actual filter modules are in many cases industrial mass-produced goods and have been technically developed.

Since the iPurifier is designed as an active parallel filter, the sales price for this product appears appropriate.

After plugging in two of these, one for analog and one for digital sources, sound is great at all hours, i.e. no more noice through the power cables.

It’s quite a while since I bought something for my hifi system, but as I was getting back into it again I thought “Why not?”

I came across this product via a YouTube video, and thought it might be a bit ‘snake oily’, and was expecting to send the unit back – especially as I already have a higher-end Furman power conditioner in use to clean up what can be a pretty horrible power supply – but … WOW!

The first thing I noticed was the bass – there was too much of it. Now, I’m really good at setting my subwoofer up, so I wasn’t expecting any difference at all, but I had to lower the level and adjust the cross over setting. After that, I was hearing into the recordings more, and leaning new things about albums I’ve known for decades.

I think a product like this requires a dirty mains supply to show its worth – hence the range of reviews here. For me, it is one upgrade I really appreciate!

This works, I suspect its going to depend on your own particular mains as to whether it helps.
Works for me.

When I believe the system can’t sound any better something surprises me and it does! I’ve been into hifi for years and I’m really annoyed with himself that I’ve waiting to now to try this! There is an improvement on all sources but on vinyl it is incredible. Definitely recommend using the smart earth.

I use this for EMF protection and to eliminate “dirty power lines” in my home. Noticeable reduction in general anxiety when two units plugged into the apartment. The only hifi unit I know of that can power condition an entire home, rather than just a limited set of plugs.

This is my second iPurifier so that should tell you what you need to know

Excellent product that does exactly as described.

Recently got a new preamp and it was buzzing slightly into my headphone amp. Checked all grounds, connections etc and couldnt find anything wrong. Plugged this in and it vanished immediately with no bad effects. Noise floor probably unmeasureable. No change to dynamics. Recommended.

Amazing on my high end HiFi system. Connected to the power strip, the separation of voices and instruments is greatly improved.

First thank you to elite audio broadcasting for the telephone reception and the relevant advice; fast delivery and well-packed package in addition. the first listening confirms the gain in hearing quality and reduction of background noise. plugged into the first outlet of the power strip, the device does the job and it does it well! 

It is a good acquisition which for a reasonable price allows a more important in audio quality; knowing that it also makes it possible to know if the current phase is good as well as the earth; it also provides effective protection against overvoltages! I think it must also bring a plus in video installation ……. for the HIFI in any case it works!

This unit is absolutely incredible, it does everything it claims, my tuner is even stabilized weaker radio stations, the imaging improved so much, that I’m total awe of my whole system

This product which I had seen a test bench met my expectations: increased dynamics, more bandwidth and natural timbres. Recommend at a fair price.

Stopped noise interference from other items
In same AC outlet

This product made a large difference, for the better, in the back ground noise level of an otherwise already relatively ‘quiet’ audio system!

This ifi clean the noise in my system

Lowered the noise floor on my headphone rig.

I purchased two and am not returning them. I was receiving unwanted noise/hum before and after plugging two into my power strip this noise seems to be gone.

If the noise comes back I will revise my review. Otherwise this has solved my problem. Thanks for making this product Ifi.

Great product

The difference was indistinguishable when directly connected to dirty mains. No configuration I tried, nor sockets seemed to have any effect. Treble has been horrifically harsh in my flat, I even forged a hookup to utilize the ground point. Holding back, I did another examination but this device seemed to have no effect. I found exorbitantly sibilant tracks were again unaffected, with identical tonality.

Where I was surprised was when I used the iPurifier with a mains conditioner, there is a clear difference in fidelity. Robert Plant has some wonderfully produced, and so I listened to Trampled Rose from the album Raising Sand, one of my favourites. I noticed a quiver in Alison’s voice at around 3:50 became more distinct. Paying attention to the drums I then noticed they were flat when I removed the IPurifier. Wow! I am mindblown.

Great for making your music sound clearer and come from a more silent background. You have to use the device for a while, and then remove it to appreciate what it does. This is not a fix all, though. Many power supplies inside gear generate noise and this can only help reduce that pollution from reaching another component over a shared AC circuit.

All your electronics need low noise power supplies or modified to have them before you can realize your system’s full potential. Even unplugging unused components can help reduce noise they put on the AC power.

Really crazy that they work as well as they do, reduced noise all over my system.

I use a line conditioner, and thought my power was clean, but surprisingly, you plug in the IFI and you can hear the sounds become more clear and focused. Go back and uplug and you can hear the sound not be as focused and clear. A wise investment if you are sitting on the fence. I’m happy, now I just keep it plugged in all the time!

This by far one of the best audio product I have ever purchased. I honestly didn’t believe EMI could cause so much harm to the audio quality.

For me, It improves the overall sound, including: imaging, instructions separation, eliminated or terminated harshness, sorround sound has more air, and also, I now get to enjoy music at lower volume. I stream Tidal, and it sound so smooth now that I end up grabbing three of this.

I am a fan now. Thank you ifi.

I have a couple small music rooms at my home that include three powered wedge floor monitor. When I added some powerline network adapters to my home, the monitors started making terribly loud digital clicking sounds. I tried routing the monitors through an APC UPS, Furman PST-8 Power Conditioner, and used ferrite beads on all my cables.

The noise on two of the monitors reduced a little, but the third was still almost unusable. The AC iPurifier seemed a little expensive, but I figured I would give it a shot because I was out of options.

I tried the AC iPurifier first on the powerstrip that the noisiest monitor was connected to and it reduced the noise a little but it was still very audible. I then moved it to the wall outlet the powerstrip was plugged into with similar results. At this point I was feeling pretty hopeless, but decided to try one more thing. I plugged the AC iPurifier into the outlet above my powerline adapter that’s connected to my router. Instantly the noise in the monitors was gone. Problem solved!

I got 2 of these. Originally I thought I would return one. But now both stay after I recorded a few samples with different configurations. I tried 3 different configurations:
1) one on the wall outlet my power strip attached to.
2) one on the power strip itself.
3) With both attached as described in 1) and 2), treble and bass quality significantly improved compared with just having one installed.

Money value is lowered because you need two at least to make it shine.

If it’s working well but it could be even better, this will help it along very nicely … with more ambiance and detail and, most importantly, a better sense of timing to the music. I use mine in conjunction with audiophile mains leads (Nordost and Furutech), power conditioning units (Nordost, ISOL8), etc where you think it might have less opportunity to improve things, but it certainly works for me. I use two and am thinking about more. Another iFi power conditioning winner, along with the excellent DC iPurifier 2 (of which I have 6 or 7)!

In regards to noise reduction, the iFi AC iPurifier works as advertised – it removes a lot of noise and makes it more bearable. It is also incredibly easy to operate and fits any power plug (in my case it’s an EU plug, but there is the USA plug also available).

There are multiple factors that can lead to electrical noise in a system, but the AC iPurifier is in fact a quick and effective solution that is not even that expensive. With its ~$100 price tag, it is affordable and can be considered an investment to surely improve the quality of the sound. Contrary to other things (i.e. cables) that may be considered pure snake oil by some, this works.

“It is user-friendly. Just insert into the audio mains extension block. It’s unique in the marketplace.This thing is actually worth giving it a try!”

“The overall sound is more harmonious in every respect – in dynamics, in transparency, in naturalness. The AC iPurifier seems to have a positive effect. The background vocalists are relaxed and in total you can hear pleasure again instead of an analytical search for missing sounds.”