Joel, the entire area doesn't have to be "filled" with sound at the level you want at your listening location. The point is to have an adequate listening level at the distance(e.g., typically 10' or so)where you are. Your 663 with a 95 watt rating should have no problem powering the VP180(it's actually slightly more sensitive than the M60s and VP150)to the levels needed.

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Enjoy the music, not the equipment.