Originally Posted by DC/Hertz View Post
Sounds like you need a sub that can play higher
I currently have two IDMAX 15s in a vented push-pull enclosure band-passed at 27 - 80 Hz. They have a reputation for performing very well at higher frequencies and that has been my experience as well.

The primary issue was at high volume levels. I like to listen to music often at very high volume. The 650s are great, but in my opionion, they just don't perform as well at the very higher volume levels like the ADs do, and the ESA Bass may actually sound a little better than the 650 in some aspects at lower volume levels as well.