about 150hrs on them and they only get better, the adjustable damping is a game changer, the upper end is so smooth and silty, no harshness at any volume, images like a dream and the bass hits smooth like a hammer in the chest
recently designed the new MA Signature MTM, this is done in cedar green porsche leather/alcantara and eucalyptus front baffle, its the big brother of the MA Reference MTM which is below in a nice light gray vinyl
after a few hrs I can tell the bass is extremely accurate, having the ability to adjust the damping is huge, tightens up the driver which cleans up any muddiness in the mid etc which really opens up the highs, amazing amplifier not broken in yet so it will get better im sure but im a happy...