I'm only familiar with the Sovereign. In terms of size and weight, as well as frequency extension, it is similar to the Dunlavy SC-V, also designed by the same man and utilizing a similar array of drivers (not the same drivers, though). It is a speaker that needs to be listened to from a distance of 10-15 feet for the drivers to integrate, in my view, and definitely needs an amp that can give it enough current to control its bass drivers, which could sound quite slow if not properly driven (it sounded quite good with early Krell KMA 200s and KRS amps, as well as the Cello Performance amps, and I know happy owners who used ARC M300s, Rowland Model 7s and the Crown Macro Reference with them). The Sovereign seemed to be a little rolled off in the highs and very full and lush in the midrange, and was (and still is) capable of outstanding performance in the right room (think big) and with the right amplification. It's a speaker that some people love and some think is bass heavy and slow (I'd blame setup for that) and therefor hate, but in my view its strength is that it does a great job of conveying the weight and soul of the music. The only review I recall of the Sovereign here in the states was in the late 80s/early 90s, when Harry Pearson got a pair at TAS and gave them a lukewarm, "great in their time, but in need of an update" review that spawned a large sell-off of these speakers in the Audiomart for as low as $4-5000. I don't know what Duntech has done to change the Sovereign over the years, but I agree with something I read in a John Marks column that a person who bought a pair of Sovereigns and Rowland amps back in the late 80s could have ignored audio changes in the past 15 years and be happily enjoying his system today. A classic speaker, in my view. Hope this was of some help; wish I could tell you about the C7000, but haven't heard it.
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