Bonded Dacron Acoustical Damping Sheet

Bonded Dacron (TM) – Polyester batting

Our product comes “bonded” which means it is in sheet form rather than loose wadding. We find it easier to measure and control this way. Our dacron is 1″ thick and measures 27″ wide. ( 1 oz per square foot – 2.2 oz/ running foot) Please order by the running foot.

The primary purpose of damping material is to block the back wave of the woofer to prevent midrange reflections and to inhibit standing waves. Placing the material behind the woofer midway to the back of the cabinet works well. There is no need to glue the Dacron – just oversize the cuts and it press-fits just fine.  Be sure not to block any port tubes or allow it to hit the back of the speaker cone.

The addition of damping material can also help trick the woofer into thinking it is in a larger enclosure. If your bass sounds a little boomy, stuffing the enclosure may remedy the problem. With vented systems, be careful not to block the port.

For a 6.5″ woofer, usually, a running foot per woofer is the norm. For subwoofers, about 6-8 running feet work well, depending on the cabinet size of course.

TL expert, Paul K. says ” I love to use the Bonded Dacron from Meniscus because it has an inherent density of 0.75 lb/ft3. Thus you can cut its 1″ thickness into any shape you want, like the internal width and depth of a cabinet, and simply stack up as many inches you need to fill a specific height without compressing or expanding the stuffing, ending up with a uniform density of 0.75 lb/ft3. I’ve found that almost every ML-TL I design and the ones I build for personal use work very well with only the first half of the line stuffed at 0.75 lb/ft3. Doing so will lower F3 and improve the bass output.”