I have the both MA6900 and B&W804s which I bought new a "while" back after an extensive listening campaign covering a range of amps, including Krells, and several high-end speakers including other B&Ws. I can tell you I *love* the combination for all types of music, including loads of rock. The key to your decision is how loud you like your music. The 804s pull a lot of current, especially when the bass drops down to 3 ohms. I regularly run at sustained 20 watts and, at parties, 100 watts. The solid state MA6900 will deliver unlimited current and stay cool if you run off the 4 ohm posts. The Mac tube amp will sound beautiful at cocktail party volume but I am skeptical you will be happy with the bass at loud volumes. Listen and tell me what you decide! One other tip - you need a good source to get enough bass out of the 804s. I changed to a better DAC (Musical Fidelity V90, under $300) and that made all the difference versus a computer or pretty good CD player.
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