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Old 26th August 2009, 03:33 PM   #1
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Default Stuffing question from a lazy bastid

I just built a subwoofer using the Dayton RSS210HF-4 driver, a 200W Hafler sub amp and an 1150 cubic inch (18.8L) sealed enclosure. The sound is much tighter and less flatulent than the Sony it replaces with a LOT more low end extension….but I made a mistake in my headlong rush to get it together last night….I forgot to stuff it.
My question is: In a small sealed enclosure like mine, how much does stuffing really matter? I’ve read opinions from “40% increase in apparent volume” to “the effect was barely measurable and not at all discernable to the ear”. My design pairs stiff construction materials with tons of braces. There isn’t an interior wall section larger than 3” X 3” without some sort of bracing, but there is no internal damping material.
Realistically what, if any, difference will opening it back up and stuffing it with polyester make? OK…I’m lazy.
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Old 26th August 2009, 03:36 PM   #2
badman is offline badman  United States
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Take 5 minutes and find out.

We don't much care for laziness 'round these parts!

It will likely give you a little more effective volume.
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Old 26th August 2009, 04:02 PM   #3
SY is offline SY  United States
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For a sub, there won't be a huge difference. You might drop the Q a skootch, but I've never seen the 40% effective volume increase in practice- more like 10% at best, and even that requires lossier stuffing than "normal" polyester. Measure the impedance curve before and after- it will tell all.
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Old 26th August 2009, 04:07 PM   #4
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Dayum....I figured someone would call me on that. I think I'm going to wait untill I'm comfortagle with the sound and have several listening sessions with the same music prior to opening it back up.
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Old 26th August 2009, 04:57 PM   #5
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I just messed around with WinIsd and the curves for both the 1150 cu in closed box and a 30% larger one were incredibly close. If I'm bored one evening I may open it up and stuff it, otherwise, unless someone can suggest another effect other than increased apparent volume, I'm not going to break out the screwdriver.
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Old 29th August 2009, 04:07 AM   #6
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You my friend are a lazy bastage, LOL. 8 screws max Sheeesh

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Quote:
Originally Posted by Lewis Moon View Post
I'm not going to break out the screwdriver.
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Old 29th August 2009, 04:53 AM   #7
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Quote:
Originally Posted by speakrsrfun View Post
You my friend are a lazy bastage, LOL. 8 screws max Sheeesh

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Only 6. Do I get extra points?
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Old 29th August 2009, 07:24 PM   #8
badman is offline badman  United States
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Quote:
Originally Posted by Lewis Moon View Post
Only 6. Do I get extra points?
You're the champ- in the time this thread has taken you could have done it.
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Old 30th August 2009, 04:21 AM   #9
Volenti is offline Volenti  Australia
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I almost always use fill in sealed enclosures, the others are correct in that it makes little difference to effective enclosure volume, but it does add a signifigant amount of resistive damping which will reduce the peak at resonance and improve subjective SQ.
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Old 1st September 2009, 09:43 AM   #10
SaSi is offline SaSi  Greece
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Apart from an increase in apparent volume, stuffing should also help tame standing waves inside the enclosure. These could interfere with the cone and have an audible effect on the sound, creating peaks and nulls to the output.

Now, is that enough of a reason to undo 6 screws?
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