Whip, I strongly lean toward favoring the two smaller subs if economics don't allow for the two bigger ones. Two widely separated subs do provide a 3dB higher volume and when correctly placed(basically, at the mid-points of either the side walls or the front and back wall, or in diagonally opposite corners)significantly smooth the bass response by reducing the effect of room modes.

Incidentally, I hope that you'll enjoy that Dvorak symphony disc.

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Enjoy the music, not the equipment.