1 (edited by HIFI 2018-04-15 15:17:44)

Topic: iFi Audio Accessory iPower 12V/1.8A

Will fit a power supply for ADI2 DAC. More clean power can improve the sound quality?
https://ifi-audio.com/portfolio-view/accessory-ipower/

2

Re: iFi Audio Accessory iPower 12V/1.8A

No, it can not.

Regards
Matthias Carstens
RME

Re: iFi Audio Accessory iPower 12V/1.8A

But users noted a significant improvement in sound when connecting the battery. On laboratory measurements, the signal noise also apparently improved.

4

Re: iFi Audio Accessory iPower 12V/1.8A

But not with an ADI-2 DAC.

Regards
Matthias Carstens
RME

Re: iFi Audio Accessory iPower 12V/1.8A

Yes, but with ADI2 PRO.

6 (edited by ramses 2018-04-15 16:15:05)

Re: iFi Audio Accessory iPower 12V/1.8A

Both units are very very similar, I think this won't make any significant difference.

UFX+,ADI-2 Pro/DAC,XTC,RayDAT,RL906D,
Win7/Cub95, Superm. X10SRi-F, E5-1650v3, Sonnet USB3-PRO-4PM-E

7 (edited by SpeakFriend 2018-04-15 16:44:58)

Re: iFi Audio Accessory iPower 12V/1.8A

HIFI wrote:

On laboratory measurements, the signal noise also apparently improved.

smile If they are laboratory measurements, no "apparently" would be needed, either it did or didn't. Would you be able to provide a link to these measurements?

8 (edited by HIFI 2018-04-15 17:38:49)

Re: iFi Audio Accessory iPower 12V/1.8A

I'm surprised that few people read reviews on the site branded of the PME ! smile smile smile

Yeah, sure.On the page http://www.rme-audio.de/en/products/adi_2-pro_ae.php here is this link http://prosound.ixbt.com/interfaces/rme-adi2pro.shtml

We tried to measure the second option, not from a desktop PC and a full-time unit, but from a laptop and an external battery to avoid possible earth loops. The results practically did not change ... Yes, the noise result increased by 0.4 dB and improved.

Power supply pulse in the set.
Noise level-118.8
Dynamic Range -118.5
Harmonic distortion 0.0002
Harmonic distortion + noise -109.4
--------------------------------
Battery     
Noise level    -120.1
Dynamic Range -119.1
Harmonic distortion 0.0001
Harmonic distortion + noise -111.3


I personally connected ADI2 DAT to a separate high-quality power supply unit on the transformer. The sound is much analogue and softer. It's deeper and the scene is wider. Of course you can not believe it. But I personally recommend replacing the power supply unit going in the kit (impulse) to any quality one.(I used a different power supply, not IFI iPower)

9 (edited by SpeakFriend 2018-04-15 17:20:44)

Re: iFi Audio Accessory iPower 12V/1.8A

I never noticed all those links at the left before... yikes

Anyway, thank you for the link, your quoted figures are apples and oranges (4 dBu ref level with PSU vs 24 dBu ref level with battery). Even so as the text quoted says the noise measurement was 0.4 dB better... I wonder whether that would hold over multiple runs.

10 (edited by HIFI 2018-04-15 17:38:10)

Re: iFi Audio Accessory iPower 12V/1.8A

Yes on the left side a lot of interesting things! smile
Yes, it's understandable 4 dBu ref level with PSU vs 24 dBu ref level with battery.Try it yourself with normal settings, create dimensions. However, regardless of the measurements, the sound changes greatly when replacing with a high-quality power supply(I used a different power supply, not IFI iPower). Apparently, the earth loops are removed and all the same noise is improved. What generally affects the overall sound quality.

Re: iFi Audio Accessory iPower 12V/1.8A

HIFI wrote:

However, regardless of the measurements, the sound changes greatly when replacing with a high-quality power supply(I used a different power supply, not IFI iPower). Apparently, the earth loops are removed and all the same noise is improved. What generally affects the overall sound quality.

May I ask how your methodology was to test this ? Did you perform double blind tests ?

UFX+,ADI-2 Pro/DAC,XTC,RayDAT,RL906D,
Win7/Cub95, Superm. X10SRi-F, E5-1650v3, Sonnet USB3-PRO-4PM-E

12 (edited by pianopictures 2018-04-16 06:57:53)

Re: iFi Audio Accessory iPower 12V/1.8A

Actually in that Russian review mentioned they just say "battery power make sense, not for sound quality, but for mobile use".

Added: ah, nevermind, later they say that because of "adapter condition" and extreme signal to noise ratios in this case they were able to see some signal harmonics that was previously masked by the noise.

I know that MC always say power sources don't make the difference, also the guys who knows "electricity" professionally say this "better power" devices usually don't make any sense data-wise. The point is that you should know exactly what problem you are solving, and all the electric signals, good or "bad" will be converted in the device anyways. So if the external component make the impact on the sound quality that should mean that the actual device have a poorly designed electric components.

Again, very curious if there is a chance MC is missing something and some pristine quality power adapters can actually make sense. Unfortunately I'm not able to fully understand the case, so like many others I could be a good target for manipulation here.

Audiophile grade SATA cables come to mind...