Interesting speculations and experiences. As TAS has just reviewed the 326 in
www.avguide.com, it would seem that their experiences are different than some expressed here.
I had a C320BEE set up in my former partner's system, and found it quite capable of maintaining clarity in the upper mids. Given that the CD player was a lowly modified JVC XL Z-1050TN, although with Nordost Frey interconnects and Nordost Brahma power cords, perhaps that was why it seemed unconfused: I can't say. The percussion opening on Mercury Living Presence's Scythian Suite was not compressed as I recall, nor was it confused (although I can't say the same for my friend's electricity! He had very old wiring in there and I doubt it helped. I put in a Monster line conditioner, but I observed some irregularities in that, but for the cost, it made sense).
I've just purchased as C326BEE because I have a clear memory of what Bob's system sounded like when I replaced the NAD with an Arcam FMJ 22 integrated. The high frequencies were more extended, but less dynamic, and a bit "dry." The midbass weight was, in his system, and now in mine (I inherited it back from him), lacking in body. The NAD is clearly less "gray" sounding than the Arcam, and layers better, has more solid imaging, considerably better delicacy (heard in voices, and flutes, and other woodwinds) and flat out sounds more real. Of course, the Arcam was made back in 1999, so progress had been made by that time, but the Arcam, a $2100 model, has never, in my observations on Usher 718s, Hales Revelation 3s, Sound Dynamic RTS 3s (which are so grainless that they resemble Avalons in this respect), ever surpassed the NAD. Given the 718 (not the BE version) speakers are around $1500.00, it's disappointing enough that I bought a '326 because I wanted the fuller sound back. I've even plugged the ASL Hurricanes into the Arcam, which improved the sound enormously, but one would expect that for a $6k amplifier. I'll just have to see if the NAD trend continues to improve.
By the way, I found the 320 to have an unrefined high end (heard especially on bells, xylophones and other high frequency instruments). There would be some sense of the transient, but not the whole thing, and certainly minimal decay, so I won't be overly surprised if the 326 does the same. There is one major difference: the 320 had no provisions on it for a power cord of another manufacturer. I can't help but wonder if the Shunyata Python CX I'm putting on it, with it plugged into an Audience Ar2p-Teflon version conditioner will show a giant improvement as the Audience Teflon version does on everything else. We'll have to see! Fingers crossed, ladies and gents!