I can echo all of the positives that Joe has put out there about the Micro ZOTL MZ22 as a preamp. It's a mind boggling bargain. I personally know of three $20k preamps that it has replaced in peoples systems and if you look at the reviews, more have fallen to it with various reviewers. Terry London, a noted reviewer who covers high end stereo components said it was not only better than the outstanding Backert Rhythym 1.1 preamp, a unit he loved in his review($7,500.00), but that is also outperformed and replaced his previous Concert Fidelity and Purity Audio preamps, that go for $24,000 and $30,000 respectively.
The life this preamp brings an incredible light and energy to music, and there is air and spaciousness that is simply stunning. It just sounds so purely musical that every time I listen to my system I am thankful for having added this magical unit. I was looking at some preamps that were three or more times the price of the MZ22 and have dropped any further considerations. It is that good!
JC