Originally Posted by noah katz
Are you sure it's not the amp clipping?
Originally Posted by corock
The roll off at 15hz is not by design, but I would assume it's due to the small sealed enclosure. 7 cubic feet is as small a box as this driver can be realistically be packed in. I wouldn't be able to eq it flat to 10 hz, it would demand way too much of the amp, which is an ep4000. Not to mention rew only eq's down to 20hz. I'm not concerned about going lower any way. I built this sub to be dedicated to music. I'm building a basement home theater this winter and my dual PB13's will handle the movie duties.
It's making terrible sounds because that amp is way-insufficient, even bridged.
However 1 ch of an FP14k would be more-than sufficient, but no less.
I used to run my 21's on EP4k's, and then I switched them to clones. I'd never go back. Difference is night and day.
If I recall correctly it took about 9db more gain below 20hz to get the same response as my LMS 18's does in the same sized box.