Roofing Felt Speaker Stuffing

50 50 wool polyester blend pillow found at walmart 4 x 4 x 3 8 or thicker carpet rebond.

Roofing felt speaker stuffing.

Polyester fiber stuffing slows down sound waves inside the box making the subwoofer perform as if the box were bigger. What s in the box. 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. By the time we get below 300hz the stuffing is basically useless.

Use 1 to 1 1 2 pounds of stuffing per cubic foot of box volume. Layers of 30 roofing felt that costs 0 17 per square foot thanks to dickason for mentioning this stuff. Full range speakers have acoustic wool stuffed into the box to remove energy due to friction as the air moves through the fibres. The effectiveness of this approach diminishes as frequency is reduced.

The sound wave coming off the back of your subwoofer reacts with the air contained in the box. Thick felt of the kind that used to be laid under carpets was a popular choice in the early days of hifi. Description our heavy weight recycled wool felt is manufactured from 100 recycled fibres. 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.

2 1 2 sheet rock screws. 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.