I've been working hard to construct a legitimate A/B testing environment for source gear. Combined with my co-workers, we have a huge number of amps, including all 5 Schiit amps. After A/Bing sever Schiit units, we've found that our Lyr and our Asgard exhibit a pretty sharp channel imbalance (the left channel is very low compared to the right). Interestingly, the Magni does not seem to have the same problem. We haven't compared the Valhalla to anything but the Asgard, and no imbalance was observed there, so I assume the Valhalla has the same imbalance.
I've tried swapping every single components in the chain, as well as using a Fiio HS2 instead of my wooden switch box. In all configurations, the only difference is in the immediate output from the amps. For the comparisons, I am using the Sony SA-5000 in the picture and a set of Senn HD 700s.
So, has anyone else observed this? I found this note on the 'Amp Problems' page on the Schiit site:
"Channel imbalance is completely normal on all amps with very small potentiometers, (volume controls) at low listening levels. This includes Magni. The channel imbalance should not persist above 8:00 on the volume pot."
All of my tests have the volume pot at around 9:00pm. I also have not observed this behavior in any of the other amps we have examined. Is this a design flaw in the full size chasis Schiit amps? Is there any way to fix it?