[fcraven]

This is probably a general question, which could be posted almost anywhere, but since I'm getting my Sub parts any day now, I thought I would post it here.

Would Homasote (http://www.homasote.com/products/440-Soundbarrier.aspx), be a good liner (or part thereof) in a sub or speaker? If you haven't heard of it it, it's basically 1/2" thick compressed recycled newspaper.This material is used in construction for sound reduction applications (and it's used a lot on stage because it makes foot steps much quieter). I'm not going to buy any of this for my speakers, but I happen to have a bunch of it left over from an old project.

I'm also weighing the heavy topic of double think MDF (1.5" total) vs. Sand box...

Fred

[WerTicus]

i think sand boxing would do far more for a subwoofer than just thicker mdf... and that sound barrier stuff is probably great.

so why not use all three ?

[Mr Content]

I always use 2 different substrates laminated together to give a better result than 2 layers of the same material. In my subs and baffles I use 3 different substrates, and end up with an almost inert baffle.


Mr C

[Danny Richie]

Lining them with that stuff certainly won't hurt, but it is not porous. You will need to allow for the air space that it takes up.

[ebag4]

Lining them with that stuff certainly won't hurt, but it is not porous. You will need to allow for the air space that it takes up.

Danny, along those same lines, if you were to use rigid rockwool (2") behind the driver, would you feel the need to compensate for the volume of the rockwool or do you feel it is porous enough that additional box volume is not required?

Thanks,
Ed

[Danny Richie]

I have not used the rockwool so really don't know for sure.

[WerTicus]

rockwool is very porous you'd not need to try and figure out its volume

[AUDFILE74]

info on rock wool

http://en.wikipedia.org/wiki/Mineral_wool

http://www.hydroponics.net/learn/rockwool.asp

[Cacophonix]

I used rockwool in my servo sub.

[SetterP]

Wow Cacophonix, that is a beautifully finished down-firing enclosure.   

Looking to start a similar project soon.  The SW-12-04 with Rythmik amp keep calling my name, and I would like to build a similar down-firing enclosure.  If you have some schematics on your brace design and box demensions I would surely appreciate them.

I am almost tempted to take Danny's sand box design and flip it on it's side with sand on front 3 sides and top, and double MDF on bottom (driver) and back (amp).  aa

[Cacophonix]

I just used danny's recommended external dimensions, and combined that with the recommended enclosure for a sealed sub at rythmikaudio website. The braces you see are what is on rythmik's site. But since i had to reduce the height of the sub, i had to remove one half of one brace since the amp was taking up space.

Btw, abt the stuffing .. first try the sub without any. Then add it if you feel the need.