Recommendation for a modern Duntech Sovereign 2001 replacement

Also worth a look is Verity Audio including the new Otello introduced at Axpona. 

“Must have superb midrange” and you are thinking to go SS and you seem to like soft dome and jazz and classic speakers - you definitely owe it to yourself to audition ATC actives - the versions with 3” super dome (50 and up).

This promotional video may be of interest.
http://www.bricasti.com/en/pro/interviews.php

@m-db 

Good point. The Duntech are quite a load (7 transducers) and as such can be dynamically constrained by the power amp.

shadorne, I'm not an engineer but I don't believe the number of transducers is the major factor in determining the necessary amp power. If that was the case then the Infinity IRS would have required something like a welding machine to drive them. ;^)

As mentioned, I owned Duntech Princess speakers for many years.  They were rated at 90 dB (with 5 transducers) but I didn't believe that.  I expect ratings can be based upon individual driver specifications, but in this case the first-order crossover was very complex.  So I believe that reduced the efficiency of the speaker overall.  In spite of the 90 dB rating John Dunlavy recommended at least 200 wpc for "optimum performance".  I tried many amps over the years, tube and SS, beginning at 100 wpc.  What I found to sound best (musical and effortless) was a pair of Parasound JC-1s rated at 800 wpc into their 4 ohm rating.

Something that may confuse the issue is that many owners of DAL speakers reported satisfaction with more modest amps.  But as far as I know the DAL line up utilized different drivers than the Duntechs.  Bottom line, I agree with shadorne that Duntechs can be constrained by amp choice but I don't believe it is because of the number of drivers.