Originally Posted by bearFNF
For S&G I made a recording of the "noise" I hear when I pause Foobar and turn the volume pot all the way up on the Asgard 2. I used HD800's and SR325i's for the test. Hi gain. You can hear the ticking sound I talked about in an earlier post.
Files can be found here: http://www.borderlandabate.org/noise
The recording device was my iRiver H120, so not the highest quality but you can clearly hear the noise. It is not much louder than the background noise in my case. So it is not that big a deal in my estimation, but it may be different for others.
For reference I did the same thing with my Magni and there is very little noise at full volume on it, so did not bother to record it.
P.S. I am really liking the Asgard 2 with the HD800's!!!
Originally Posted by Oldandslow
If you get a chance, try the "hum test" with the inputs to the Asgard 2 unplugged. I did, and there's no noise/hum at all. Dead quiet. The hum I heard was coming from the interconnects/d.a.c./computer, not the amp. Sorry about that, Schiit! :)
Well, I think bearFNF did find something. I tried this on mine; I also did what Oldandslow suggested, but in addition I connected my Musical Fidelity V-CAN II instead of A2 and did the noise/hum test again.
Using Beyerdynamic T50p (32 Ohms), here is what I could hear.
1. Just to establish a reference point, Musical Fidelity V-CAN II, volume at 100%: very slight noise, could barely hear it. No hum, zero. Nothing at 0% volume.
2. A2, low gain, 0% volume: very low noise and low hum; while I could hear it, I could only tell it was there if I unplugged headphones and then plugged them back in. This stayed the same until volume reached 2 o'clock, then hum started to increase.
3. A2, low gain, 100% volume: clearly audible hum; about the same noise (masked by hum completely).
4. A2, high gain, 0% volume. Clearly audible noise (same as MF V-CAN II with volume at 100%); low hum as in No.2. I was surprised by the noise here, honestly. Hum stayed the same until volume reached 11:30 o'clock, then started to increase.
5. A2, high gain, 100% volume. Very strong hum, almost as loud as would be music at moderate volume. If any headphones would require listening at this position, it would be completely impossible. Please note though that T50p listening position was with volume at 9 o'clock in high gain, which is not required at all (low gain is where T50p belongs).
6. A2 with no interconnects: almost no hum (high gain, volume at 100%). While one could conclude that the hum was coming from outside, it is not so (see No.1). Even without that, as I was using AudioQuest Cinnamon RCA interconnect coming out of Musical Fidelity V-DAC II, I doubt this equipment would produce any audible hum/noise (I do use MF V-PSU II though).
I will pay more attention to the above with my other headphones and will update if anything differs.