• WANTED: Happy members who like to discuss audio and other topics related to our interest. Desire to learn and share knowledge of science required. There are many reviews of audio hardware and expert members to help answer your questions. Click here to have your audio equipment measured for free!

ifi iPurifier3 USB Filter Review

Rate this USB Filter/Tweak:

  • 1. Poor (headless panther)

    Votes: 61 40.9%
  • 2. Not terrible (postman panther)

    Votes: 60 40.3%
  • 3. Fine (happy panther)

    Votes: 15 10.1%
  • 4. Great (golfing panther)

    Votes: 13 8.7%

  • Total voters
    149

voodooless

Grand Contributor
Forum Donor
Joined
Jun 16, 2020
Messages
10,532
Likes
18,604
Location
Netherlands
I love how is shows improvement on the Modi 2, because that means it can be an improvement for bad DACs. Which means I can tell people for whom this does anything that "of course it works for you, it has been proven to improve performance of badly designed electronics". It's the ultimate Uno reverse card for the your-gear-isnt-good-enough-to-hear-it-crowd.
But for $149, you can easily buy a good DAC ;)
 

pavuol

Major Contributor
Forum Donor
Joined
Oct 2, 2019
Messages
1,596
Likes
3,983
Location
EU next to warzone :.(
iFi:
REclock2-300x166.jpg

Amir:
Remeasure / Rethink / Refuse

:p
 

thewas

Master Contributor
Forum Donor
Joined
Jan 15, 2020
Messages
6,939
Likes
17,110
One typical concept of "high end" audio, make some problematically engineered devices so you can sell more devices to improve their performance, companies like Linn, Naim etc. were some of the first to use it and be even successful with it.
 

bboris77

Senior Member
Joined
Oct 23, 2018
Messages
462
Likes
957
What is a MELF resistor? I originally read it as something different, but I did not have my glasses on ;)

Joking aside, I can’t believe that this device does not act as an electromagnetic USB isolator at this price point. At least it would have some sort of purpose then.
 

fpitas

Master Contributor
Forum Donor
Joined
Jul 7, 2022
Messages
9,885
Likes
14,247
Location
Northern Virginia, USA
What is a MELF resistor? I originally read it as something different, but I did not have my glasses on ;)

Joking aside, I can’t believe that this device does not act as an electromagnetic USB isolator at this price point. At least it would have some sort of purpose then.
MELF is basically a through-hole resistor body with no leads, but SMT pads. They enjoyed a brief popularity until the modern SMT parts appeared in force. I bet there are billions out there available for almost nothing.

Yeah, for $20 this thing might be cheap insurance. Still easier to just buy competent electronics.
 
D

Deleted member 35357

Guest
Amir, would you be willing to test such devices in reverse?

In my experience, the pre-amp + ADC found in USB measurement mics are a lot more sensitive to power supply issues than a typical DAC. Admittedly this is a niche use case, but it might be a real one.
I'm interested in this as well as I recently bought a miniDSP Umik-2 and was suprised by the noise my PC power supply adds to the measurements. Would be interesting to know if a device like this would allow for better noise floor on these things.
 

DonR

Major Contributor
Joined
Jan 25, 2022
Messages
3,040
Likes
5,792
Location
Vancouver(ish)
MELF is basically a through-hole resistor body with no leads, but SMT pads. They enjoyed a brief popularity until the modern SMT parts appeared in force. I bet there are billions out there available for almost nothing.

Yeah, for $20 this thing might be cheap insurance. Still easier to just buy competent electronics.
Commonly found as input protection in DMMs.
 

fpitas

Master Contributor
Forum Donor
Joined
Jul 7, 2022
Messages
9,885
Likes
14,247
Location
Northern Virginia, USA
Commonly found as input protection in DMMs.
Interesting. Higher breakdown voltage than regular SMD, maybe?
 

AudioKC

Active Member
Joined
Jul 28, 2021
Messages
191
Likes
243
ifi iPurifier3 Measurements
Isn’t it the first “cleaning” device that really works?

For that reason I voted “Great” :p:facepalm:
 

RandomEar

Senior Member
Joined
Feb 14, 2022
Messages
344
Likes
826
How does it determine what is noise and how does it take it out?
The noise is on the power and/or ground line, not on the data line. Therefore, anything that isn't 5 V DC can be filtered.

The claim of "re-clocking" and all the other mumbo-jumbo probably describes nothing more than a USB repeater IC.
 

diaolodoro

Member
Joined
Jul 26, 2022
Messages
33
Likes
72
So new properly designed DACs already implement this "noise cleaning"/filtering by adding these few components inside the dac, in a more cost effective way and offering excellent performance without needing any unnecessary external device.
That surprised nobody... at least in this forum.
At least the iPurifier actually works as intended, which is not always a given.
 

Lambda

Major Contributor
Joined
Mar 22, 2020
Messages
1,798
Likes
1,535
There was a ton of noise in the FFT spectrum with the noise floor jumping up and down every few seconds (no doubt due to activities in my PC). That in turn caused the SINAD to vary continuously between 84 and 91 dB. This variation is system specific and could be worse (or better) on other host computers.
Since every computer is different in this regard ( of outputting noise over USB) A proper test for this category of products (and DACs) would be CMRR vs frequency from the USB.

Some DACs are sensitive some not, some PCs output a tonns of noise, some don’t.
This can make huge difference as some USB DACs that measure "perfeckt" with SINAD over 110dB can perform worse then a mid range DAC with Optical input if you have a noisy USB port.

So new properly designed DACs already implement this "noise cleaning"/filtering by adding these few components inside the dac,
You would be surprised... many "high end" (measuring) DACs directly share the USB and Analog GND.
Only very view have true (galvanic) isolation.
 

kazuviking

Member
Joined
Sep 5, 2022
Messages
9
Likes
0
I really wanna see this compared to the Holo Audio Titanis.
If my 20$ chinese dac is capable of filtering my laptops noisy usb with no audio dropouts or artifacts them its safe to assume that most dac's can filter it as well.
 
Top Bottom