Sherod:
I find the sound of percussion to be pretty dynamic on the CX series, but it depends on the preamp one has and whether or not it has considerable dynamics in the upper midrange. I had a King Cobra V2, which I re-bought last year (I missed it!) before I ever got the newer CX series cords. The CX is distinctly lower in noise, purer and "faster" without being "leaner" in sound. And the dynamics were superior on the newer CX series in the upper midrange.
I recently bought a Convergent preamp, but it's an earlier model (circa 1988) and the upper midrange of the Convergent from that area is lightweight in that area. I'd have to say from other equipment I've used that the dynamics in the upper midrange are good. A caveat here: my ASL Hurricanes have -- once again -- blown a resistor, and until they're repaired (next week), you need to take this with a grain of salt. I'd rather err on the side of caution here. It may be better than I've stated: the Hurricanes are extremely dynamic in all parts of the frequency spectrum, including the upper midrange. When I had my First Sound Deluxe Mk II preamp, and older models Shunyata (specifically, I used The King Cobra V2s on the amps, although Grant [Hi, Grant] expressed mild surprise I was using them on the amps [they were made for cd players and other front end equipment that had a harsh upper midrange, which the King Cobras "softened]), the dynamics, perhaps due to Nordosts' Quattro Fil interconnects, were quite good. Literally, the hair on my neck stood up, and, being Black, that's quite a feat! I remember, when I played Gaite Parisienne, which has considerable percussion, I never felt there was a lack of energy in that frequency. But again, I don't think the CAT is quite as dynamic there as the First Sound.
I will say that, when I, briefly, had the Parasound JC2 preamp, the dynamics were great, and I had the CX'es at that time. I quite like the CX Pythons. Someone on here (in another thread) asked me to take the Synergistic challenge -- so I did. I tried Synergistics' $2400 power cord. As I indicated in a different thread, in my system, the difference was slight, between the Synergistics cord and even the Shunyata CX Viper power cord. Maybe others have had different results, but those were mine. Frankly, I was pleased the difference was not a night and day thing.
I don't think one can go wrong with these at all, unless one is looking for a compensatory piece of equipment (warmer, richer, leaner or whatever) to fill in the gaps in other pieces of equipment.
I'll let you know how everything sounds when the 'Canes are repaired. Right now, they sound rather ordinary, and Hurricanes are NOT ordinary sounding. Ever. I can actually listen and be bored right now, where what SHOULD be happening is that I should be gripping the edge of the listening chair wondering if my woofers are going to blow. Oh, I've re-inserted the Hales Revelation 3s into the system, but I mainly used Usher 718s. NOT the BEs, I want to make clear, but the pre-beryllium/titanium garden variety tweeter.