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u guys think its a good idea to put dynamat inside this fg box i just got??? all around the walls and make rings for the 12" circles where the speaks go.... now i dont have the best **** in the world.. they prolly the worst in the world.. but i got the subs for free... ohh well what eva make it sound better i guess.. what say u?

 
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That is would be alright but more expensive
or
You can fill it with POLY FILL from a fabric store.

 
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i wouldnt waste your money on dynomatting it, they make special mats that go inside and remove backwave distortion, but unless your going to SQ comp its a waste of money, well unless you have electronic ears.

 
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I have some poly-fill from Halloween left over if you want to buy it offa me.

 
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Poly-fil isn't necessary if your box is built to specs. You only need it if your box is too small. At least thats what I've been told

 
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Thats true, poly fill is ment the "give you more air space" sort of, it slows the bass wave down making it seem as if the box has more air space

 
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Do you have MDF on the side of the box resting on the floor in that picture? I'm guessing so because it's flat. As long as the box is solid you won't get a benefit out of Dynamat. Filling it with poly-fill is a good idea with sealed boxes. The rule of thumb I remember is no more than 30% of box volume, I might be wrong though.

 
Rep Power: 339

well i put it in w/o any of the **** .. it sounds good but i hav not tested it really loud as u can see it was dark and i have neighbors.. ill find out tomorrow.. but from what i heard it sound good..now i have to figure out what to do with the amp to make it show ready and i need a capacitor and anchor down the box but i dont want to drill holes.. mayb velcro will do tha trik... ill let u know..

 
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what kind of subs are those?

 
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They look like Kenwood tornadoes. I had a previous generation of those.

 
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yep those r them

 
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dynamat or alternate sound deadeners inside a box is common, and always a good idea. your box can never be too solid, too dead, too resonance free.

more than one top car competing for SQ world finals uses dynamat or an alternate layed inside their subwoofer boxes.

and certainly every top competitor uses polyfill in their boxes. Once the resonances are taken care of, the polyfill can disperse any of the internal reflections that may occur.

 
Rep Power: 321

Def use dynamat, for people telling you not to, they obvisually don't have a damn clue of what they are talking about. The dynamat will take any noise you have, other than the actual subs out. Try laying the dynamat on the inside of the trunk, so that the carpet covers it. You don't want that **** rattling. My whole trunk is layer with it. I think we used 2 layers in the back. Also, get the dynamat for the license plate, helps a ton. I'm prepping my car to get the headliner, floor, doors and firewall. The sound of you car will sound completely different once you do it.

 
Rep Power: 337

I wouldnt go that far. its not immediately apparent what the advantgage is to use dynamat for this app.

remember, this thread is only about one particular application for sound deadener - inside a subwofoer box!