Gary, although there's no way to be sure exactly what "lean" means to you, I'd suspect that you may be used to an inaccurate "fullness" in some frequency range. Above the low bass, which the sub would handle, NRC measurements and personal listening show that the M22 is extremely accurate(some prefer a more "laid-back" response), so any emphasis in the upper bass which would give an impression of greater fullness would in fact be an inaccuracy in that speaker.

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Enjoy the music, not the equipment.