Roofing Felt Speaker Stuffing

Thick felt of the kind that used to be laid under carpets was a popular choice in the early days of hifi.

Roofing felt speaker stuffing.

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. Cup w binding posts madisound td cup. 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. 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. Use 1 to 1 1 2 pounds of stuffing per cubic foot of box volume. By the time we get below 300hz the stuffing is basically useless.

The sound wave coming off the back of your subwoofer reacts with the air contained in the box. The effectiveness of this approach diminishes as frequency is reduced. 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. 50 50 wool polyester blend pillow found at walmart 4 x 4 x 3 8 or thicker carpet rebond.

Full range speakers have acoustic wool stuffed into the box to remove energy due to friction as the air moves through the fibres. In most regions it is better than the.