But, particularly in the case of very efficient drivers, there is the issue of overdamping. Too much control over the driver can lead to a bass response that is less natural and not as deep as it otherwise could be. My Aleph 30 amp was great except that it was overdamped, causing an unsatisfactory bass response. I have since gotten an Atma-sphere amp with a lower damping factor that works much better with my speakers. As always, synergy with speakers is the key.