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Dynamat inside a sub box?

Old 05-11-2005, 09:50 AM
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What effect would applying sound deadening material (Dynamat or similar) to the inside of a sealed sub enclosure have on sound quality?

I have a spare prefab box that I want to use temporarily. The previous owner was a bit enthusiastic with the drill and there are several holes that need to be filled. As a lazy solution I was thinking of sealing them up by applying scrap pieces of sound deadening on the inside. Bad idea?
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Old 05-11-2005, 09:53 AM
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It will work fine if the material sticks to the MDF. Some materials will fall off over time.

What about some silicone or costruction adhesive to fill those holes.
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Old 05-11-2005, 03:07 PM
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Thanks for the reply. I'll try to not be so lazy and use some silicone before resorting to the Dynamat.

But back to my original question, what effect on sound (if any) would Dynamat have when applied inside a sealed sub enclosure?
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Old 05-11-2005, 03:16 PM
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The material would add mass to the sub box panel.

I have seen this done many times, you might hear a little bit 'tighter' bass.
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Old 05-11-2005, 04:35 PM
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To restore worn screw holes in mdf use a little wood glue and toothpicks in the holes, snap off the picks flush when they bottom out. Use one or more picks depending on how much fill you need.

And although I've never done it, lining the inside of a prefab box with deadener sounds like a good thing to me.
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Old 05-11-2005, 05:40 PM
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I bet there are people on this forum who will tell you that MDF is porous too. Let's not start that up again.

[ May 11, 2005, 06:41 PM: Message edited by: loudtdi ]
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Old 05-12-2005, 03:53 PM
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^exactly!
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Old 05-13-2005, 12:25 PM
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you could always just line the inside with fiberglass resin.
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Old 05-13-2005, 08:16 PM
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Wouldnt that take away from the volume of the box or would it be neglegable? I think i need to do that to my box.
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