Loudspeaker Holes Marerial

[PanStef]

Welll, Recenlty I decided to use again my hode Hi-Fi system... I connected everything correctly with my pc and wirth the amp but i noticed something at the bottom of hte loudspeakers.... There are two holes at each louspeaker and at the back of them there's something which is like cotton (although it isn't, it's stronger)... There was a material covering the hole (that material had holes) but after 17 years it is too crushy. So an aunt of mine gave me a large amount of that material and i cut it at the demensions of the hole... It is ok.... I noticed that from there come out low frequencies or/and bass... Am i right? What is that material called and what's its purpose? Thanks a lot in advance.

 

[americanaudiophile]

The holes are "bass reflex ports". More info here:
http/en.wikipedia.org/wiki/Bass_reflex
The material in the back is damping or sound absorbing material. Depending on the age of the speaker it could be long fiber wool, dacron, or polyfill.
http/www.parts-express.com/acousta-stuf-polyfill-speaker-cabinet-sound-damping-material-1-lb-bag--260-317
It should not be inside the port and is not usually packed tightly The material covering the hole was just to keep the material in and stuff from getting inside. Your replacement material should be as porous as possible.