Pass Labs X600.5 or a Pair of Classe Omicron's?

Doc, there is no upgrade possible for the Pass LabsX-600's to the new generation .5 series. I believe that the 600's were the best sounding of all the X-generation amps, but the new X-.5 series is a significant change/improvement compared with the first generation X-series. If you can get a pair of 600's for that amount of money, it would be a great addition to the sonics of your system. I have heard the Classe amps in a couple of different systems, but can't be helpful regarding if their is a significant sonic difference them and the PassX-600's because it was not an audition in my own system. In my system for years I used Transparent cabling, went through a long period of auditioning over five different cable companies wires and finally decided on Acoustic Zen IC's and speaker wire. It's all personnal taste and system synergy, but I believe the Acoustic Zen wires are significantly better then any of the Transparent stuff and very reasonable priced. I have a review of the new Acoustic Zen Absolute reference here on the Gon that you might find helpful. Hope this helps.

Teajay,
I see some adds where you can trade up the X600's to X600.5's for $6K. This is the upgrade I was writting about. I believe Audio-Video Logic has this deal. I would think for $6K the improvement should be as significant as the price difference. It would then be a $12K venture. Still a savings off retail. I've heard nothing but great things about the Omicron. For the most part I've heard all good things about the X600's with a couple of folks saying they were a bit dry. I would think source, cabling and speakers might make a huge differnce in that opinion. I know Classe's sound. I have a CA-201. Great little amp. Warm and and liquid, nice base extension. Can't help but think the Omicron will sound great. Have you ever found the X600's to be dry? BTW, I'll look at the Accoustic Zen review and cables - thanks.

-Doc

The top-end on the 600s is more neutral to my ears.I've heard both and really liked the PASS.Any thoughts on going to a different pre?The digital pre/parametric EQ units would work well (Tact RDP-1/2).

Sorry Doc, I thought you mean't by up-grading the 600's to 600.5 was an actual modification that could be done by Pass Labs, not the trade-in deal offered by Audio-Logic in Iowa. To answer your question, no I did not find the 600's "dry", but not as "warm/musical" as the Aleph 1's mono-blocks in my system. I would suggest you might try auditioning a 350.5 in your system, which I think sounds better then the 600's, and still would save you another $3000.00 in total cost. Unless you need that much power, I drive MG-20R's in large room and have all the current I need, its a beautiful sounding amp that has the "warmth/musicality" of the Aleph series with the dynamics/details of the X series.