BTW,
Rythmik also makes a vented (ported) version of the model. Here are some test results, if you're interested. Outside of group delay below 20hz, these are pretty impressive numbers. The subs go deep and loud and stay clean (for such low frequencies, anyway).
http://www.avsforum.com/t/1342986/rythmik-audio-fv15-hp-data-bass-test-results
Rythmik also makes a vented (ported) version of the model. Here are some test results, if you're interested. Outside of group delay below 20hz, these are pretty impressive numbers. The subs go deep and loud and stay clean (for such low frequencies, anyway).
http://www.avsforum.com/t/1342986/rythmik-audio-fv15-hp-data-bass-test-results