Dynamat and boxes......

[Demi 10+ year member]

Alrighty, im about to build my first box this weekend and i have been reading that sound dampanres can be a big part of the SQ of a box. Should i dynamat the entire inside of my box? Will it help?

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[wesl56 10+ year member]

no, dont put it on the box... put it on everything else tho

just use 3/4 MDF, wood glue, and plenty of screws... and brace if its gonna be big

 

[azbass 5,000+ posts]

im going to use DynaPad on the inside of my box.

 

[Blazemore 10+ year member]

using raammat inside mine, thinking about going back and sandwich in a layer of ensolite, help yes.

 

[PowerNaudio 10+ year member]

The short answer is: no, adding a deadeningmaterial to the inside of a cabinet will not generally

increase SPL, but you should know by now that I

don’t like to leave it at the short answer. Let’s look

a bit deeper…

I used the word “generally” in the first sentence

because it is possible gain an increase in SPL;

however, there are a lot of different qualifiers. If you

start out with a really poorly built cabinet, you can

gain a greater increase than you could with a wellbuilt

cabinet. However, the gain will likely only take

you to close in SPL to the well-built cabinet, not

over. By building the cabinet correctly in the first

place, you eliminate the need for deadening at all.

And we are talking about “deadening,” which does

nothing to stop a cabinet wall from bowing. For

that you need “stiffening.”

But go ahead and add deadening material to a

near perfectly constructed cabinet and you will still

gain an increment, which is a slick way of saying

“tiny amount.” By tiny, I am referring to fractions of

a decibel. You need to get in the range of three

decibels to hear a perceivable difference, so anything

less than a single decibel is about feeling

good rather than real SPL gains. If you like the

idea of gaining a half-decibel, go ahead, but don’t

expect to hear any difference.

As you can tell, I like many others place great

importance on the quality of construction first.

Using heavy, stiff materials and bracing, build the

strongest box you can with sides that don’t flex

or bow. Then feel free to add sound deadening

material to “enhance” the cabinet. The use of

sound deadening material in a well-built cabinet

will be the icing on the cake by helping with internal

cabinet resonances through adding mass to

the panel.

I remember Dynamat introduced a product

called Dynaboard several years ago. This unique

material was composed of essentially two sheets

of wood with a sandwiched layer of Dynamat

inside. I really liked that idea for its approach to

anti-resonance and recently noticed that the custom

home theater industry is using the same

material.

thats some of the finds ill keep on looking since this is a subject that im realy interested on.

 

[Trixie]

cascade audio makes a spray that works well.

 

[blue93corsica 10+ year member]

thats some of the finds ill keep on looking since this is a subject that im realy interested on.

where did you find that quote btw?

because im not sure if its the same person or not but derek lee is the owner of the school 'mobile dynamics' which is basically a car audio school which i just attended

 

[PowerNaudio 10+ year member]

where did you find that quote btw?
because im not sure if its the same person or not but derek lee is the owner of the school 'mobile dynamics' which is basically a car audio school which i just attended

here http://www.mobiledynamics.ca/resources/articles/CAE-0502-TROUBLE-10-12.pdf

it was as simple as googleling the first sentence on the quote.

laters

 

[M@nJo 10+ year member]

i bought some prefab dual sealed box off eBay, will i benefit much from deadning inside?

ps: hifisoundconnection sucks on eBay

 

[Trixter 10+ year member]

i bought some prefab dual sealed box off eBay, will i benefit much from deadning inside?

ps: hifisoundconnection sucks on eBay

only if you use duct tape and tar paper...

no, seriously, you probably won't be able to tell the difference.