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iFi AC iPurifier - Video Mini Series - The look, the tech, the lowdown. MORE ADDED!

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  1. bmichels
    interesting. I just hope it is not one more "black magic" item !
     
  2. DeeKay10
    You have got to be ****tin' me...
     
  3. Zapp_Fan
    Hmm, again my ignorance is probably showing, but ANC requires the signal and noise to be separate, otherwise you don't know what signal to flip. This device only sees one signal coming in, the power from the wall. Since we know it is not regenerative (?) it's not generating its own 60-cycle wave to compare the noise to.

    So maybe it's actually using common mode rejection or something? Does that generally work on AC power? I actually don't really have a clear idea of what the signal and noise waveforms coming out of an electric socket look like.
     
    Last edited: Dec 19, 2017
    Swetone Audio likes this.
  4. Alcophone
    I am not an electrical engineer, so I don't know for sure, either. But Jason said this:
    (There's more after, but this is the relevant part)

    So if you measure the voltage, you can lock on to the phase of the underlying 60 Hz signal. Then you know what you should be measuring and what you are measuring, and the difference between the two is noise.
     
  5. Alcophone
    What I like about this approach is that it makes A/B testing super easy. Just continue to listen, as you insert/remove the power conditioners. No need to turn your main equipment off.
     
    buonassi likes this.
  6. iFi audio
    First, we need to assure everyone that no snakes were hurt in the making of the iPurifier AC and no snake oil is contained in the product, the only oil in the production chain is crude oil that provides the basics for the plastics used.

    th.jpg

    Is there a scientific basis for the function of the device? Certainly and we can measure significant attenuation of noise on our 2.5GHz RF spectrum analyser between the AC iPurifier inserted and removed.

    Indeed using additional plug in capacitors to filter HF noise is not exactly new and tends to be fairly effective at higher radio frequencies. However both practicality and safety agency requirements mean the values of these capacitors have to be fairly low and their effect is thus limited to higher frequencies, often > 1MHz.

    In modern EMC (electro-magnetic compatibility) testing, typically frequencies below 150kHz are not included and frequencies below 500kHz allow relaxed levels of noise emission.

    So many power supplies (even linear ones) release fairly large levels of noise in these frequency bands while passing all EMC standards. And it is often these lower RF noise components that cause trouble in audio systems and that are not easily filtered inside of audio gear either (no matter how diligent the designer is).

    Going active allows us to address especially this < 500kHz noise rather effectively. This way the AC iPurifier achieves very wide bandwidth compared to simple passive capacitor based plug in devices.

    Harmonic effect (2).png

    Our ANC uses a simple analogue forward circuit, which is very fast and is backed by and hands over to capacitor based passive filtering for high frequencies. So there is no "noise echo" or any such problem.

    Where the active circuit is fast enough to provide the opposing noise it kills noise, where it becomes too slow passive filtering through capacitors takes over.

    The use of active noise suppression in mains powered systems is not exactly new, it has been used in large scale industrial applications for a while. It's application in domestic power systems to reduce mains born noise at frequencies much lower than possible using passive means and specifically to improve audio systems.

    ===========================

    A single AC iPurifier is fine to use and provides significant objective noise reduction. More than one unit in use increases the noise reduction in our measured tests more than the expected simple doubling/tripling etc. and provides wider bandwidth of noise suppression as well.

    Further, as any noise has to "pass by" the AC iPurifier placing it between "noisy" devices and "noise sensitive" devices improves the situation more for noise sensitive devices than placing it at the beginning or end of a power extender strip.

    ==============================

    A note on the surge suppressor. These devices are in parallel with the mains, they are not resettable circuit breakers - instead their function is to limit any voltage between live/neutral by drawing extra current.

    hudun-da.jpg

    This current drawn to limit the voltage to safe levels may very well trip conventional current based circuit breakers, but the MOV is NOT a circuit breaker in itself. It also needs no re-set, if the surge is over it simply stops drawing current to limit the voltage.

    ===============================

    We'll release our tech notes soon, so stay tuned!
     
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    Matias and Alcophone like this.
  7. Alcophone
    Awesome response, thanks a lot! I appreciate that your product is basically vegan :p
    I'll get one just to try it out.
     
  8. Matias
  9. iFi audio
    The official launch date is already in the past, hence the product is already available. Please feel free to ask your local iFi representative about it.
     
    iFi audio Stay updated on iFi audio at their sponsor page on Head-Fi.
     
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  10. Matias
    I checked all 4 us dealers on your website, including your own Amazon page, and still not available. I suppose I have to wait a little more for them to list it.
     
  11. Swetone Audio
    Unless this device has been tested and approved by UL, then anyone using it is taking a big risk.
    Extraordinary claims require extraordinary proof, preferably provided by an independent testing laboratory.
    I cannot find any reference to "industrial active noise cancelling" for AC power.
     
  12. Matias
    Last edited: Dec 19, 2017
  13. iFi audio
    It might take them a while to do this, hence direct mail is the best shot.
     
    iFi audio Stay updated on iFi audio at their sponsor page on Head-Fi.
     
    https://www.facebook.com/iFiAudio/ https://twitter.com/ifiaudio https://www.instagram.com/ifiaudio/ https://ifi-audio.com/ info@ifi-audio.com
  14. iFi audio
    Please take a look at extensive tech nfo we provide for our products. As we wrote, AC iPurifier will have its own as well. That's neither black magic nor snake oil approach, but proper R&D instead.
     
    iFi audio Stay updated on iFi audio at their sponsor page on Head-Fi.
     
    https://www.facebook.com/iFiAudio/ https://twitter.com/ifiaudio https://www.instagram.com/ifiaudio/ https://ifi-audio.com/ info@ifi-audio.com
  15. sinkr
    Bah, looks like a great way to needlessly eat up power outlets!
     
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