Kurt_tank, Albert certainly has a lot of power but even he will tell you that he doesn't use it. We suspect that his amps rarely make it out of class A. On the 750s that's not a lot of power.
As to 'thunderous bass' I am quoting one of my customers. I am guessing that a lot depends on the amps, so apparently like many other speakers it makes a difference what amps you put on it...