soundproofing spray

[mohog]

has any one ever sprayed the inside of their sub box? does it make a difference in the sound pressure? i've heard people stuff it with insulation and i was wondering if puting a couple coats of rubber undercoating would do the same or better.

 

[Black Magic]

That would help with deadning the walls of the box vibrating. Plus keep it Air Tight. However, It would not do the same thing as Poly Fill. Poly fill makes your Speaker respond like the box is bigger than it really is.

 

[mohog]

thats good. i'm not trying to trick the subs or anything like that i'm just trying to make it thump a little more. the box doesn't flex that i can see, but i just wanted to add something in their to make sure it won't. i'm going to go ahead and do it then. thanx.

 

[izackary]

If I put 2 Boston Acoustic 12" subs into a small sealed enclosure only about 6 or 7 inches deep (the woofers are 5-5/8" deep and only need 1 cubic foot each) exactly what would polyfill do to the sound? I've never played with it so I'm not sure.

 

[Black Magic]

It will only help. I think it makes it seem like 1/3 more space to the speaker.

 

[metalhed]

Polyfill just slows down the airwaves inside the box..

I've got a good image in my head on why and how this makes for a bigger and better sound, but I can't really describe it on paper.



Back to the original question.. I think it's a good idea to at least paint the inside of a box. Wood (mdf) isn't completely air tight, so you should try to seal it somehow.

Herculiner would make it alot stronger, as well as keep it airtight.

 

[mohog]

i'm using duplicolor rubber undercoating spray, which is basicly the same thing, possibly a little more difficult to work with but it'll do the job for cheap. do you know if it adds a little more bump in a system and is their a difference if you screw down your box to the car. i heard that helps too.

 

[metalhed]

Sealing it with that stuff seemed to make my bass hit a little more crisp. I liked it alot better because I think it improved the overall sound quality. If you wanna do it, then go for it. I love experimenting with different elements of a system.


I can't really think of any reason why you'd have to bolt down a box though.. Unless it was built to where the subs are inverted, and the weight of the magnets could somehow tip the box over during acceleration or turning or whatnot. I guess also for the security, but some good dark tint and some "intelligent" bumping (not in parking lots, in your neighborhood, etc) can go a long way.

From my experience, the weight of my subs, coupled with a carpeted box on a carpeted surface, doesn't allow for much movement. Not noisy movement anyway.

If you want to go a cheaper and easier route, get a big heavy duty strip of velcro and lay some down between your box and the carpeting.

 

[VairKing]

I coated the inside of my sealed box with a coat of liquid fiberglass resin. It dries rock hard, and will greatly improve the structure of your box, as well as making it 100% air tight. I then covered the resin with a layer of fatmat, and then filled half the box with poly fil. My sub hits great, and I dont think I would do it any different way.

 

[Black Magic]

VairKing has the best idea so far! I like that.

 

[mohog]

i did the spray thing, and for some reason my subs aren't hitting as hard. it's a sealed box and usually when i press one sub in the other comes out and now it doesn't do that. it's like there's a big hole in the sub. do you think i blew them somehow or would that even have a difference in the pushing thing.