Best Material to Reduce Box Volume? - AVS Forum
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post #1 of 7 Old 02-28-2014, 09:18 PM - Thread Starter
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I made the box for my sub on the large side on purpose if I ever decide to go ported. I need to reduce the volume by about 1 cf. I have a bunch of books in there right now but the way I have the bracing set-up I really need to custom fit something. I know most people just use 2x4s cut and glued/screwed but I'm curious if there's anything lighter I could use. With the box + sub + amp this thing already weighs around 100 lbs. 

 

Some people have mentioned foam sheet insulation but I question whether this is dense enough. Is there anything any of you have used/would recommend that would effectively reduce volume while being lighter than wood? 

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post #2 of 7 Old 02-28-2014, 09:23 PM
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Closed cell foam insulation.

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post #3 of 7 Old 02-28-2014, 09:48 PM - Thread Starter
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Originally Posted by wassub View Post
 

Closed cell foam insulation.

Are you talking about the sheets? Something like this: http://www.lowes.com/pd_15358-1278-3/4X48X96+R-TECH_4294858106__?productId=50100630&Ns=p_product_qty_sales_dollar|1&pl=1&currentURL=%3FNs%3Dp_product_qty_sales_dollar%7C1&facetInfo=

 

I should notice no difference using this as opposed to wood, right? 

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post #4 of 7 Old 02-28-2014, 10:42 PM
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Yes and correct.

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post #5 of 7 Old 03-01-2014, 12:43 AM
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Quote:
Originally Posted by invain View Post

I made the box for my sub on the large side on purpose if I ever decide to go ported. I need to reduce the volume by about 1 cf.
Why even bother? It's just going to change the Q slightly and room effects and EQ (if any used) will completely smother the difference.
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post #6 of 7 Old 03-01-2014, 01:10 AM
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Oh yeah, especially if it's used for HT. Just leave it as it is imo.

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post #7 of 7 Old 03-01-2014, 08:12 AM - Thread Starter
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Originally Posted by A9X-308 View Post


Why even bother? It's just going to change the Q slightly and room effects and EQ (if any used) will completely smother the difference.

The sub I'm using calls for a 2.4 cf box with a qts of .7. It also has an FS of 15 hz so there is bottom end for days. Like I said I added a bunch of books to reduce volume by .6 - .7 cf and it made a pretty huge difference. 

 

I'm also using the top end of the sub's power handling and I was hitting max extension way too easy at low frequencies when I first tested it out with an effective box volume of around 4 cf. 

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