Roofing Felt Speaker Stuffing

Glass fibre insulation material was irritatingly used for much of the 60s while polyester or acrylic fibre similar to that found in cheap sleeping bags duvets or pillows gained popularity in the 70s either inserted loose or stapled.

Roofing felt speaker stuffing.

At 11mm thick it is suitable for damping the walls of a speaker cabinet to change the resonant frequency and q it is also effective at reducing the back wave from the rear of your drivers. 50 50 wool polyester blend pillow found at walmart 4 x 4 x 3 8 or thicker carpet rebond. Cup w binding posts madisound td cup. Polyester fiber stuffing slows down sound waves inside the box making the subwoofer perform as if the box were bigger.

The sound wave coming off the back of your subwoofer reacts with the air contained in the box. By the time we get below 300hz the stuffing is basically useless. Full range speakers have acoustic wool stuffed into the box to remove energy due to friction as the air moves through the fibres. Thick felt of the kind that used to be laid under carpets was a popular choice in the early days of hifi.

What s in the box. Description our heavy weight recycled wool felt is manufactured from 100 recycled fibres. Layers of 30 roofing felt that costs 0 17 per square foot thanks to dickason for mentioning this stuff. 6 heavy zip cord 12 gauge or heavier radio shack has heavy speaker wire which works well 1 pkg.

Use 1 to 1 1 2 pounds of stuffing per cubic foot of box volume. The constrained layer of roofing felt reduces the peak vibration by almost 20 db and the average by about 10 db relative to the blue curve without a damping layer.