I have also found that my UM Miracle (16 Ohm, 114dB) is usable with the Conductor, but that there is an audible AC buzz between tracks (or very low level music) both when listening off the internal DAC and from an external source. This haven't been the case with the Soloist at home. I should add, that I haven't heard the Conductor at home yet, so it could be caused by a cleaner electricity at home, but I don't think so. I will have to see next weekend.
Today I took the Conducor to a local hifi shop in order to compare the DAC section of the Conductor to Hegel HD20, a Norwegian DAC. I was using HD20 > RCA into the amp section of the Burson and listened with both my HE-6 and Miracle. Transport was Squeezebox Touch and music was my own in very different genres (pop, dance, classical, jazz, vocal).
Comparing the DAC section of the Conductor to the Hegel HD20, there is not much diffenence actually, but within the hour I was listening I did come to the conclusion, that the Hegel sounds more natural in the upper mids and treble. This is especially audible on voices - both male and female. It's like the Conductor's DAC accentuates the upper part of the frequency range more, but without sounding aggressive or harsh, I should add. The Hegel just sounds smoother or more analog in the upper frequencies. That's actually a little surprising to me since the DAC in the Burson just hit the market, while the Hegel is two years old. The difference was consistent when I changed between S/PDIF and Toslink from the Squeezebox Touch to the respective DAC's.
In other words, if going for highest possible SQ and not WAF, then a Soloist with the HD20 DAC would be a better choice. Since the Hegel is succeeded by the HD25, it should be relatively easy to get a HD20 cheap - either second hand or at a discount. When all this is said, I still think the Conductor is not only a beautiful, but also a very good sounding DAC / HP-amp, and if I didn't compare it directly to the Hegel HD20, I wouldn't miss the more natural sound of the Hegel DAC. This is my honest opinion.