speaker stuffing substitute

[thezaman]

I am building a set of speakers that I got plans for off of Parts express ,they are called the tritrix transmission line .I have had a hard time getting parts ,they were either o/s or sent the wrong items.I need acousic stuffing to finish them is there a product from a craft store that is close to this material?I want to finish tonight .

[Cal Weldon]

Hi,

You can go to the fabric store and get a polyester batting used for pillows. Similar to fiberglass but no itchies.

[thezaman]

thanks for your help!!

[Svante]

I wrote this a while ago, it might be worth considering:

http://www.diyaudio.com/forums/showt...743#post995743

Polyfill and fibreglass are not completely equivalent.

[thezaman]

Can you tell me what effect stuffing has on a transmission line speaker?i was going to use 12 0z. in each and listen to them.the box height is 39 inches and the instuctions say to loosly fill behind both woofers.

[ptwining]

No scientific evidence to quote - tho I do remember some references - I find lambs wool most excellent...

Maybe someone else will have the research but it's all I use...

[edit] I think PartsExpress carries it and has an article, or used to...

Regards,
Tom

[Cal Weldon]

I also like to use rockwool A.K.A. basalt insulation. Perhaps Svante can fill us in here (no pun intended)

Polyfill - lightest, least dense
Fiberglass - meduim
Rockwool - heaviest, most dense

With those proerties it seems that you would require the most polyfill and the least rockwool. Not sure if the frequencies that are affectively damped are different among those though.

[ptwining]

This guy likes it for his "Dahlia" project - offered only as an empirical opinion on the nice characteristices of wool.

I swear, no graphs to prove it tho, that after four years of prototypes, long fibre wool is nicer than the man-made stuff. Who knows, maybe it's the lanoline...

Actually, I think it's the dense weave of the wool, plus the fact that the fibres are oily and dense.

Perhaps I'm just batts. (no pun intended).

Sheeps - fabulous.

Feb 1986

Dick Olsher

I used long-fiber wool, in the form of a quilt batten (also known as a carded batt), for cabinet stuffing. Available locally (for me) from the Rio Grande Wool Mill, this batten's random weave is far preferable to the yarn variety because it does not clump up in the bottom of the cabinet. (It's great stuff for transmission-line enclosures.) About half a pound of wool per enclosure is optimum. Be sure to drape the wool over the internal brace so that the wool actually occupies the central volume of the enclosure. This is where standing waves develop, and where the wool will do the most good in attenuating them. Incidentally, long-fiber wool is technically 2.5 to 4.5 inches long and, naturally, is sheared only from those sheep that qualify. I recommend wool over foam or (even worse) fiberglass, because it attenuates midbass frequencies without significant absorption of the deep bass around 30 Hz.

Regards,
Tom (and Dick)...