Brad,
I remember that there was quite a bit more detail in the ultra. I thought the micro was good, but the ultra seemed much more transparent. As far as the PSU is concerned, I don't think I really did much of a comparison. I hooked up the astrodyne and just enjoyed it.
will
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Home Rig: Sonos ZP90 coaxial to Headroom Ultra desktop DAC, Headroom Balanced Ultra Desktop Amp W/PSU to balanced Sennheiser HD800 w/ALO sxc balanced cable.
Office rig: Macbook Pro to Pico DAC to ALO Rx amp to JH-13pro
Portable rig 1: Iphone 3gs 32gb and Sennsaphonics 2x-s/JH-13's. Portable rig 2: Ipod Classic 160(7g) ALO cryo dock and ALO Rx amp to Sennsaphonics 2x-s/JH-13
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