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  #1  
Old 11-02-2016, 08:45 AM
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Default Sound Dampening inside box

anybody ever dynamatted the inside of a box?
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Old 11-02-2016, 10:39 AM
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waste of time and money, if you feel frisky resin that b*tch
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Old 11-02-2016, 01:29 PM
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For sure. Resin and sand that thing with 200 grit. Will fill up those pores in the wood and lower your box rise (very slightly I might add).
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Old 11-02-2016, 01:50 PM
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I once bought a box 2nd hand which a local shop built
Every panel was double layer 3/4" MDF with original dynamat in the middle.
if you want a box which wont resonate, use MDF.. if you want it even deader? deaden it.
but don't use Plywood and then deadener
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Old 11-28-2016, 08:21 PM
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Quote:
Originally Posted by iamsonic View Post
I once bought a box 2nd hand which a local shop built
Every panel was double layer 3/4" MDF with original dynamat in the middle.
if you want a box which wont resonate, use MDF.. if you want it even deader? deaden it.
but don't use Plywood and then deadener
Why wouldn't you use plywood then deadener?
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Old 12-17-2016, 11:30 AM
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Old thread.... but home theater guys deaden their boxes all the time. In a car you won't tell as much.
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Old 12-17-2016, 11:49 AM
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Quote:
Originally Posted by edouble101 View Post
Why wouldn't you use plywood then deadener?
might as well just use MDF instead
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Old 12-17-2016, 11:54 AM
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If you are using mdf you would be hard pressed to get panel resonance in a subwoofer box, assuming you have fastened the panels correctly. Very uniform density, ideal for acoustics. With ply you may have resonances in higher frequencies than a subwoofer will play, due to the density differences in the wood, and proper bracing usually does enough to eliminate them. But for a subwoofer, panel flex should be your only concern, not panel resonances.
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Old 12-18-2016, 08:10 AM
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Dynamating inside a sub enclosure? Nah, not necessary.

Resin the insides of a sub enclosure? Sure. Some people have. Others don't. Takes time to do tho...in between drying and applying. So what's the difference between a reg ported enclosure with nothing inside vs one that has resin inside? Perhaps a more smoother response? Or just plain making it as solid as a rock in hopes to not resonate?

A properly built enclosure with plentiful of bracing should do the trick.
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Old 12-18-2016, 09:53 AM
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Quote:
Originally Posted by Boomintahoe View Post
Dynamating inside a sub enclosure? Nah, not necessary.

Resin the insides of a sub enclosure? Sure. Some people have. Others don't. Takes time to do tho...in between drying and applying. So what's the difference between a reg ported enclosure with nothing inside vs one that has resin inside? Perhaps a more smoother response? Or just plain making it as solid as a rock in hopes to not resonate?

A properly built enclosure with plentiful of bracing should do the trick.
Assuming the resin dries to a smooth surface, air will see less resistance fleeing over it. In the port, the more resistance the air sees the "heavier" the air spring is, so a resined port will tune it higher. But not by much.

The real benefit of resin is to create a one-piece shell on the inside of the box to seal it well
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