James,
Have you auditioned the Cube amps with your Maggie MG20.7's? Are the 7B3's enough, or do I hold out for the 28's on my Maggie MG20 ? Currently using Classe CAM400 monoblocks, which frankly, are inadequate, with 800 watts into 4 ohms. I realize it's not all about sheer wattage, but the 4 ohm output of the 7B3's is essentially the same, at 900 watts.
I need an amp that can deliver the unrestrained crescendos and subtleties of my BDP2/BDA3 combo.