There isn't that much difference between the output of the 1/2 and 2/3. (I use 2/3s in a similarly sized room to good effect.) You would be fine w/the 2/3s. BTW, they are wonderful speakers that never fail to sound great.
Yeah, the vibration thing w/the Classic series is what makes them sound the way they do. I tried to quell the vibes one time, and the speakers lost whatever it is that makes me want to make a fool of myself playing air guitar.
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