bobgpsr is right, this is a servo controlled sub, lower distortion equals better sound. The driver used has excellent distortion numbers even without the servo. My sealed cylinder was built to 1.9f3, because the cylinder is a more efficient cab than a cube. 2.1f3 is what Brian at Rythmik recommends for a cube, but you could get by with around 1.7-1.8f3. The servo also allows for more extension, around 13Hz in my 12x14x7.5 room. My sub is located
here just a little moe than halfway down on the page.
Give Brian a call, he is very helpful and more than willing to answer any questions you may have.
