[iFi audio]

 
That's good to hear, other posts on other forums have suggested that while the iPower does provide very low noise power to it's connected component, it still leaks substantial noise back into the mains like any other SMPS.
 
Safe to say those posts are from the uninformed?

 
Hi,
 
There are preconceptions about SMPS/DC power........like they cant be low-noise..........but like hybrid cars, the technology is now advancing at such a clip that such things can be done and it should be gradually becoming the norm. Like now hybrid cars are very good indeed and starting to surpass their diesel/petrol brethren.
 
More specifically, the iPOWER has a 6-Input Array which stops noise 'leaking' back into the mains (the 12-Output Array is used on the DC barrel side).
 
Hence why AMR/iFi have pushed so hard to crack the nut that is an audiophile DC power supply.

 

[music_man]

ifi, i did not mean to alienate you. i hope you did not take it that way. this is ymmv. as are all such things in the practice of audio. however, there are clear pictures of what is inside the iusbpower for instance. very nice quality in fact. i was wondering if you would post a picture of the inside of this device. unless it is a trade secret in which case i fully understand.

 

[iFi audio]

  ifi, i did not mean to alienate you. i hope you did not take it that way. this is ymmv. as are all such things in the practice of audio. however, there are clear pictures of what is inside the iusbpower for instance. very nice quality in fact. i was wondering if you would post a picture of the inside of this device. unless it is a trade secret in which case i fully understand.

 
Hey,
 
Absolutely all is good. It's Friday so we are chilled.
 
This is as much of the internals as we can divulge as the Active Noise Cancellation is a little neat.
 

 

[music_man]

it's cool. of course I would really like to see the guts. I am sure so would some other folks if you catch my drift. therefore I get where you are coming from. I have no doubt you have figured out something pioneering. regardless if everyone notices a difference. that is always subjective. I just wish I knew what you did but I completely understand your stance on the matter. I am honestly more surprised about the pics of the isubpower on the net. unless someone opened it themselves in which case you could sue them of course. I personally would not have showed that and I am guessing you in fact did not. as I am sure you know, you stand to lose more there than with the power brick
 
however judging from the iusbpower you guys do not just make things for the sake of making them. regardless of it was meant to be posted it is pretty obvious what that does. I have several of them. I do have the power brick but would be hard pressed to tell a difference. I can measure it is very clean power though. I do not do things against peoples will so I am not opening it myself. that old rs is somewhat noisier but holds the voltage more steady. apparently that makes a difference to my vaunix brick. I would be hard pressed to quantify this sound though. of course as I always say this is a huge ymmv. there is no givens in our hobby.

 

[iFi audio]

  it's cool. of course I would really like to see the guts. I am sure so would some other folks if you catch my drift. therefore I get where you are coming from. I have no doubt you have figured out something pioneering. regardless if everyone notices a difference. that is always subjective. I just wish I knew what you did but I completely understand your stance on the matter. I am honestly more surprised about the pics of the isubpower on the net. unless someone opened it themselves in which case you could sue them of course. I personally would not have showed that and I am guessing you in fact did not. as I am sure you know, you stand to lose more there than with the power brick
 
however judging from the iusbpower you guys do not just make things for the sake of making them. regardless of it was meant to be posted it is pretty obvious what that does. I have several of them. I do have the power brick but would be hard pressed to tell a difference. I can measure it is very clean power though. I do not do things against peoples will so I am not opening it myself. that old rs is somewhat noisier but holds the voltage more steady. apparently that makes a difference to my vaunix brick. I would be hard pressed to quantify this sound though. of course as I always say this is a huge ymmv. there is no givens in our hobby.

 
Hi,
 
The video has as much as we can divulge on a public forum. Where we can divulge, we do. But where it is a little more sensitive, we do have to be a bit more reserved.
 
We do understand your interest though - it is really appreciated.

 

 

[music_man]

i completely understand. sure, i would like to see it. then next thing you now some chinese company has your technology. i get it. the bottom line is for $49 no one has anything to lose really. in fact i am very happy you made it so affordable. it could have been $99.

 

[Yviena]

Im kinda confused is the 12v ipower 1.1a or 1.8a?

 

[music_man]

ot, ifi i had a question for you. will the iusb 2.0 power supply still filter data if my dac does not use +5vusb power? it is simply not present in my dac it only uses the data line. thank you
 
edit: ahh, i see the i usb power 2.0 is just a power suply. hence it's name. the 3.0 model filters the data but i am using 2.0 ports and cables. oh well. so much for that idea. i do not want to use an adapter on $1,800 cables lol.

 

[Jimi Zeen]

Ifi Audio website states 12Volt is 1.8A

http://ifi-audio.com/portfolio-view/accessory-ipower/

 

[Yviena]

I know the website says 1.8a but on my 12v ipower it actually says 1.1a.

 

[greenkiwi]

Hi,

For those who want the absolute best it is the iPOWER but it is only available in 5/9/12/15v.

However, the DC iPurifier works for 5v > 24v (handles up to 3.5A).

One is a specialist and the other a generalist that works across a whole range and can be used here, there and everywhere (because it accepts the whole rage of different voltages).

More details later. Cheers.

This is really helpful.

I was going to pick up an iPurifier for my Geek Pulse, but it sounds like the iPower is the way to go. 12v 1.8a is perfect.

Cheaper and better performing.

 

[iFi audio]

I know the website says 1.8a but on my 12v ipower it actually says 1.1a.

 
Hi,
 
Run with 12v/1.8A.
 
As the iPower's originally designated voltage (when it went to print) was a bit conservative hence 12v/1.2A.
 
The certification bodies informed us we could use a higher, voltage of 12v/1.8A.
 
Cheers.

 

[ginetto61]

Hi !
i have some questions. 
1)   maybe i have missed it but with which mA output the noise/ripple figures are measured for the 5V unit ? 
2)   the noise is given in the audio band.  If a 5V power supply is used to power a usb dac how much significant can be the noise beyond the audio band ?
Thanks a lot indeed.
Kind regards, gino 

 

[iFi audio]

  Hi !
i have some questions. 
1)   maybe i have missed it but with which mA output the noise/ripple figures are measured for the 5V unit ? 
  Kind regards, gino 

 
Hi,
 
The noise is measured using the closest current load to nominal loading that our dummy load provides. For the 5V unit this is around 1.2A (due to the limits of our dummy load).
 
 

  Hi !
i have some questions. 
 
2)   the noise is given in the audio band.  If a 5V power supply is used to power a usb dac how much significant can be the noise beyond the audio band ?
Thanks a lot indeed.
Kind regards, gino 

 
This depends a lot on the design of the DAC itself.
 
Actually, the high frequency noise in the iPower is also really low. Generally the noise floor above the audio-band is lower than the audio band noise, which is one of the reasons we only specify audio band noise.
 
There are some noise components from the switching frequency (at around 100kHz). With generic SMPSs & Chargers 0.03V RMS (or 44dB below 5V) noise are common. By comparison in the iPower, this noise is guaranteed to be below 0.00001V RMS (or 114dB below 5V).
 
Indeed, many regulator ICs used for audio have greater audio band and high frequency noise than these 0.00001V from the iPower. Hence normally the levels of high frequency noise remaining in an iPower should be low enough to have no consequence whatsoever on a USB DAC (or any other Audio Device), even one that has only minimal or no built-in power supply filtering/regulation.
 
Cheers.

 

[ginetto61]

Originally Posted by iFi audio /img/forum/go_quote.gif 
Hi,
The noise is measured using the closest current load to nominal loading that our dummy load provides.
For the 5V unit this is around 1.2A (due to the limits of our dummy load).
This depends a lot on the design of the DAC itself.
Actually, the high frequency noise in the iPower is also really low.
Generally the noise floor above the audio-band is lower than the audio band noise, which is one of the reasons we only specify audio band noise.
There are some noise components from the switching frequency (at around 100kHz).
With generic SMPSs & Chargers 0.03V RMS (or 44dB below 5V) noise are common. By comparison in the iPower, this noise is guaranteed to be below 0.00001V RMS (or 114dB below 5V).
Indeed, many regulator ICs used for audio have greater audio band and high frequency noise than these 0.00001V from the iPower.
Hence normally the levels of high frequency noise remaining in an iPower should be low enough to have no consequence whatsoever on a USB DAC (or any other Audio Device),
even one that has only minimal or no built-in power supply filtering/regulation.
Cheers.

 
Hi ! 
thank you very much indeed for your very kind and valuable reply.
Really a great little unit indeed I understand.
I will try one for sure.
Thanks a lot again.
Kind regards,  gino