Is a sub sonic filter necessary if the subwoofer in use will never see eneough power to reach maximum excursion (even below the tuning frequency of the box)?
Just be sure you put a clean signal at high level too, don't crank the gain like no tommorow //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif