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 camper, ive owned each of the amps over the last 5 years and each level up its more of the same, however, with the 159 it doing things the others did not