All I can say is as great as their amps are, I was a bit disappointed with their preamps.
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I have to agree with Jtinn. Had a X-0, and was a bit disappointed and sold it. Lach of depth, resolution and warmth. were apparent. I had used it for 8 months and Pass Labs kept on telling me give it time ,the break in period. After spending $7K from a dealer, I don't think so. X-0 is nice to look at, but that's about it. I went back to a Threshold Fet 10E and found it to be a better performer.
I disagree. I recently bought an x-1 and x-ono, replacing an Aleph P and Aleph ono, and found them warmer,richer and quieter; and the Alephs were no slouch. In case you haven't seen it, the last Absolute Sound had a section entitled Golden Ear Awards, and in it Tony Cordesman gave a capsule review to the x-1 and x-ono, and said he thought they were the state of the art.
Yes the Pass X-1 is definitely better than the Aleph P, but that is not saying a whole lot. I am a Pass Aleph amplifier owner and a clear Pass bigot when it comes to the Aleph amps and I have respect for the X series amps, but, IMO, the X-1 clearly doesn't measure up to the best tube preamps. According to Pass, you have to leave it on all the time in order for it to sound its best and I've heard that while it sounds better, it never achieves that A-1 sound which can be had with some of the best tube equipment. In my audition with the Pass X-1 and the X-350, I heard an overly heavy bass and no midrange sweetness. Certain musical passages were overly bright. If you compare it to the Aleph P, yes it sounds great, because this wasn't an exceptional preamp at all. I completely agree with Jtinn and Topkat. Pass Labs has a great reputation for designing amplifiers, but that reputation does not carry over to preamplifiers.