Stephane, I've found the trim setting on my almost three year old EP500 to be very useful in balancing the bass output by compensating for room gain in small and average rooms. As I indicated in a thread on this point some months ago, dropping the feature was surprising to me and the subsonic filter doesn't duplicate its effect. Obviously Axiom should supply a manual(or a supplement)which accurately describes the current features.

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Enjoy the music, not the equipment.