Not a clue. But, take a look at my review of the Super 8s at www.positive-feedback.com. They are truly remarkable speakers, but I have also heard good things about the AZ Adagios.
Verity Tamino's beat both the Forest and the 8's IMO. I've owned all three and would consider the Tamino in your mix. I've not heard the Adagio but a good friend of mine says they are really fast, best for a surround system. He find the 8's very musical. Get out and listen to them all if you can.
The AZs may be relatively inefficient, but with a pretty flat 6ohm impedence, they are indeed, tube friendly. My 22watt 845 SET sounds truly excellent with them. The best sound I have experienced, in my modest system.
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