Cordesman did two reviews of the X-1 and X-Ono, in December and January or January and February, in the last one of which he did the comparison. I have the X-1 and X-ONO and love them. However good the X-O is, you have to have room for a three box preamp, and I sure don't, and Cordesman says very clearly that he found that the power supply should not be close to the main module. On either of these, you might call Audio-Video Logic in Indianapolis--they regularly run big specials on Pass, and they're very reliable to deal with.
