[maty]

http://gr-research.com/diysubwooferkits.aspx

The Servo Sub kit 2
http://gr-research.com/servosubkit2.aspx




-> http://gr-research.com/sw-12-04.aspx




http://www.rythmikaudio.com/GRci.html

[mlundy57]

I'll say that the sealed FG12 woofer is the best box bass I've heard.  But yeah, it's not going to hold a candle to the dual OB servo subs for music.

I agree. That's why I have both in my OB system. OB subs for main speaker duties and the sealed sub for movie special effects.

[maty]

YouTube FAST BASS! What Audiophiles need to know!

[maty]

Rythmic L12 Subwoofer Review, closed sub
https://www.audiosciencereview.com/forum/index.php?threads/rythmic-l12-subwoofer-review.12140/