When I switched amps from Bryston 7BSTs to Krell I initially purhased a 300cx and had that for two days before realizing that, concsistent with my thoughts at that time about upgrading my speakers later, I had sufficient funds and time to return it for full purchase price toward an upgrade to a 400cx. When I got the 400cx home and hooked it up I was not in the least bit disappointed by the increase in clarity and extension driving my Dynaudio Contour 3.0s that I had at that time. There was a marked improvement all around; detail, air, depth, image width and bass extension were the most notable differences as my sonic memory recalls. And later I upgraded to Thiel CS6s and this pairing turned out to be an excellent match (conversations by phone with Shari [a goddess!] at Thiel confirmed that Jim uses Krells routinely for auditioning his designs, especially the cx series). So yes, I experienced first hand the audible improvement of the 400cx over the 300cx. Depending on the remainder of your system, this difference may or may not be so marked as it was in my case. But if you can swing the extra bux, go for the 400cx. And in both cases I was using the KCT pre hooked to the 300cx and 400cx via CAST.
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