Reply to thread

Message: <blockquote data-quote="Buck" data-source="post: 8792533" data-attributes="member: 591582">A 4th Order BP is just a sealed box inside of a “booster” ported box.  The extra ported box plays more evenly away from both sides of the ported section, which is why they’re tuned higher for the same frequency response as a normal ported box, because the sealed side resonates low enough and keeps the cone controlled and keeps the woofer from unloading.A 4th order BP is primarily a sealed box on a ported box’s steroids.  By far, the most important thing is the sealed side.  If you don’t understand the Qtc and Fc/Fsc/Frc, and how that changes the nature of sealed boxes, then you’re probably not going to make the best 4th order BP, unless you get lucky enough to do the right sub in the right volume.</blockquote>

Top