Suggestion on dampening 15" Dayton Ultimax 3 sq ft - AVS Forum
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post #1 of 19 Old 02-01-2014, 08:22 PM - Thread Starter
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I bought the 3 ft kit and and I"m about to start building it. What do you suggest for dampening if anything?

Line 4 sides with foam?

Equipment: Denon AVR-4520, Fusion Tempest (LCR), Fusion Alchemy (4xSurrounds+Wides+Heights),15" Dayton Ultimax X 4, SMX 2.35:1 Screen
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post #2 of 19 Old 02-01-2014, 10:54 PM
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.5 to a pound per cu ft is what most guys go with including more and none. Here is a good link to Data that refers to it. Be sure to read the summery at the bottom though. Insulation works but some don’t like that option. A pillow or two works depending on size of course to name a few.

http://www.data-bass.com/data?page=content&id=79

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post #3 of 19 Old 02-01-2014, 11:10 PM
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post #4 of 19 Old 02-01-2014, 11:23 PM
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If using the cheap wal-mart pillows, they are almost exactly .5 cf of fill. I put 1 pillow per CF of box space and it's perfect. The pillows are $4.99 each (in Canada anyways)

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post #5 of 19 Old 02-02-2014, 07:56 AM - Thread Starter
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Quote:
Originally Posted by N8DOGG View Post

If using the cheap wal-mart pillows, they are almost exactly .5 cf of fill. I put 1 pillow per CF of box space and it's perfect. The pillows are $4.99 each (in Canada anyways)

I was told by a speaker designer that with a plate amp, I should avoid the polyfil type of material. Do you use the fil with an plate amp on yours?

If I do go with fil, I'll definitely go with the Walmart pillow idea.

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post #6 of 19 Old 02-02-2014, 08:29 AM
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Quote:
Originally Posted by Jeff in Canada View Post

I was told by a speaker designer that with a plate amp, I should avoid the polyfil type of material. Do you use the fil with an plate amp on yours?

If I do go with fil, I'll definitely go with the Walmart pillow idea.

I don't use polly with plate amps no. You don't take the fill out of the pillows (though I'm sure you knew that but just saying), just stuff the whole thing in there.
I only have one amp that uses a plate amp, the rest are passive and the passives are half and half, pillows and fill (because I got a giant bag for super cheap and used it on 4 of them)

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post #7 of 19 Old 02-02-2014, 08:43 AM
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Polyfill does nothing for damping the enclosure, it only lowers the Fb. You should adhere rigid fiberglass or Acoust-X to the cabinet walls. http://store.acrytech.com/Speaker-Cabinet-Coating-Acoust-X-Sound-Damping-Coating.html

http://www.bobgolds.com/AbsorptionCoefficients.htm

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post #8 of 19 Old 02-02-2014, 09:04 AM
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Quote:
Originally Posted by Face2 View Post

Polyfill does nothing for damping the enclosure, it only lowers the Fb. You should adhere rigid fiberglass or Acoust-X to the cabinet walls. http://store.acrytech.com/Speaker-Cabinet-Coating-Acoust-X-Sound-Damping-Coating.html
Type 700 fiberglass damps, but so does polyfill, or any one of a dozen alternatives. Type 700 is a good material in terms of damping per inch thickness, but other materials work equally well if you use enough of it. Fb can be lowered with any damping material, if you use enough of it. If you significantly lower a vented box Fb you used too much.
FWIW I prefer to line a cab, rather than just tossing in a pillow, which will leave a lot of panel area exposed, and the purpose of damping is to cover the panels, rendering them non-reflective. With a sub you need that property to extend to 300Hz or so, which will take a couple of inches of damping to realize. One especially good material for subs is felt carpet padding, due to its high density it takes less of it to work well in the lower mids/midbass.

Acoust-X is too thin to do much of anything below 10kHz or so.

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post #9 of 19 Old 02-02-2014, 09:19 AM - Thread Starter
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Quote:
Originally Posted by Bill Fitzmaurice View Post

Type 700 fiberglass damps, but so does polyfill, or any one of a dozen alternatives. Type 700 is a good material in terms of damping per inch thickness, but other materials work equally well if you use enough of it. Fb can be lowered with any damping material, if you use enough of it. If you significantly lower a vented box Fb you used too much.
FWIW I prefer to line a cab, rather than just tossing in a pillow, which will leave a lot of panel area exposed, and the purpose of damping is to cover the panels, rendering them non-reflective. With a sub you need that property to extend to 300Hz or so, which will take a couple of inches of damping to realize. One especially good material for subs is felt carpet padding, due to its high density it takes less of it to work well in the lower mids/midbass.

Acoust-X is too thin to do much of anything below 10kHz or so.

For a sub?

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post #10 of 19 Old 02-02-2014, 09:40 AM
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Originally Posted by Jeff in Canada View Post

For a sub?
Subwoofer drivers create above bandwidth harmonics that must be damped. And crossovers aren't exactly brick wall either, so the program material is another source of above bandwidth content. Standing waves are another issue. Modern sub cabs tend to be too small for them to arise within the subwoofer passband, but they will arise in the mids, so they need damping as well.

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post #11 of 19 Old 02-03-2014, 09:55 AM - Thread Starter
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What thickness / brand is suggest? I'm looking at Parts-Express but it looks like they are a fair bit.

Would 1" Paper faced OC703 work well? Glue the paper side to the inside of the box?

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post #12 of 19 Old 02-03-2014, 10:32 AM
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Originally Posted by Jeff in Canada View Post

What thickness / brand is suggest? I'm looking at Parts-Express but it looks like they are a fair bit.

Would 1" Paper faced OC703 work well? Glue the paper side to the inside of the box?
I like to use two inches of foam in subs. Mattress topper open cell foam is cheap and readily available locally.

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post #13 of 19 Old 02-03-2014, 11:54 AM
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post #14 of 19 Old 02-03-2014, 12:04 PM
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Originally Posted by rajacat View Post

+1

Spectrum Sludge looks good too.
http://store.secondskinaudio.com/spectrum-sludge-1-gallon/
In a car door maybe, but not a subwoofer.

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post #15 of 19 Old 02-03-2014, 12:33 PM
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In a car door maybe, but not a subwoofer.

Why not ?
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post #16 of 19 Old 02-03-2014, 01:47 PM
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I had this leftover 2" thick recycled cotton based material, and used it to line my recent subwoofer 4 cu ft ported box for resonance control.
sub%2520lining-3.JPG
top lined also
sub%2520top%2520inside%2520cotton%2520glued.JPG
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post #17 of 19 Old 02-03-2014, 03:15 PM
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Quote:
Originally Posted by Bill Fitzmaurice View Post

I like to use two inches of foam in subs. Mattress topper open cell foam is cheap and readily available locally.

Does using the foam change the internal volume? And just lining it with this is better then pillows?

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http://www.avsforum.com/forum/155-di...0-build-4.html
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post #18 of 19 Old 02-03-2014, 05:48 PM - Thread Starter
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I'm still not hearing a consistent answer.

Sealed and ported subs are treated the same with regard to lining?

Equipment: Denon AVR-4520, Fusion Tempest (LCR), Fusion Alchemy (4xSurrounds+Wides+Heights),15" Dayton Ultimax X 4, SMX 2.35:1 Screen
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post #19 of 19 Old 02-03-2014, 07:19 PM
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Quote:
Originally Posted by Jeff in Canada View Post

Sealed and ported subs are treated the same with regard to lining?
They are not, read this, which was already linked near the top of the thread:
http://www.data-bass.com/data?page=content&id=79

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