I`d think the Melody AN 211 and the Coincident Frankenstein are going to sound quite different from each other,yet both would likely be excellent and special in their own way. That would be a very interesting comparision with the Zu DEF speakers.No loser in this match.I have`nt heard the Melody 211SET but I`d bet it`s fanstastic.
Morganc, what 300b tube are you using? I`ve had my Franks for over 3 years and have used EH Golden Grid(ok) Western Electric re-issue(just ok) Black Treasure,(very good) Sophia Royal Princess(excellent!). The absolute best IMO the Takatsuki TA-300b(japan) very expensive(1800 USD) but elevates the Franks to the truly sublime tier, just superb.This amp runs the 300b 'very conservatively' and will extend the life of the expensive tubes. Just something to consider.You`ll hear every bit of this superior tube with your transparent Frankenstein.The Sophia Royal Princess is close to the Takatsuki`s performance and better than the other tubes mentioned above.
Regards,