08-17-2020, 09:15 AM
Voici la copie du post du forumeur Hollandais dont je vous avais parlé (sur "Steve Hoffmann Music Forums").
Il aurait lu ça dans un magazine allemand, donc impossible à vérifier, mais bon, y'a pas de théorie du complot pour autant !
Davey said: ↑
Sure, I understand they have a power strip too, but the iPurifier itself has both active and passive filtering to cover the full frequency range. How effective it is in each situation, if at all, that's for the user to decide. The principle is sound, that was really my point.
You are right! I found a labtest of the iFi AC purifier in a German audio magazine confirming your statements.
![[Image: uc?id=1XZ_37jDer82DT60NXwxNh99dzzEgRhnf]](https://drive.google.com/uc?id=1XZ_37jDer82DT60NXwxNh99dzzEgRhnf)
Their findings are:
- it effectively reduces noise of ca. 9-30kHz by ca. 20-25dB, provided the ground is properly connected. This performance is roughly in line with other, more costly power filters, which they also tested.
- without ground noise filtering reduces by ca. 10dB.
- plugging it into the power strip (iFi Power Station with X2 capacitors) only marginally improves noisefiltering.
The above lab results were confirmed during listening tests, some improvement without ground connected, more improvement with ground, minimal improvement when plugged into the power strip, provided you use a good quality alternative power strip.
The iFi AC-iPurifier got a recommendation.
LakeMountain, Apr 15, 2020
Il aurait lu ça dans un magazine allemand, donc impossible à vérifier, mais bon, y'a pas de théorie du complot pour autant !
Davey said: ↑
Sure, I understand they have a power strip too, but the iPurifier itself has both active and passive filtering to cover the full frequency range. How effective it is in each situation, if at all, that's for the user to decide. The principle is sound, that was really my point.
You are right! I found a labtest of the iFi AC purifier in a German audio magazine confirming your statements.
Their findings are:
- it effectively reduces noise of ca. 9-30kHz by ca. 20-25dB, provided the ground is properly connected. This performance is roughly in line with other, more costly power filters, which they also tested.
- without ground noise filtering reduces by ca. 10dB.
- plugging it into the power strip (iFi Power Station with X2 capacitors) only marginally improves noisefiltering.
The above lab results were confirmed during listening tests, some improvement without ground connected, more improvement with ground, minimal improvement when plugged into the power strip, provided you use a good quality alternative power strip.
The iFi AC-iPurifier got a recommendation.
LakeMountain, Apr 15, 2020