Stuffing question from a lazy bastid

Lewis Moon · 26th August 2009, 03:33 PM

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.

badman · 26th August 2009, 03:36 PM

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.

SY · 26th August 2009, 04:02 PM

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.

Lewis Moon · 26th August 2009, 04:07 PM

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.

Lewis Moon · 26th August 2009, 04:57 PM

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.

speakrsrfun · 29th August 2009, 04:07 AM

You my friend are a lazy bastage, LOL. 8 screws max Sheeesh

Speaks

Quote:

Originally Posted by Lewis Moon

I'm not going to break out the screwdriver.

Lewis Moon · 29th August 2009, 04:53 AM

Quote:

Originally Posted by speakrsrfun

You my friend are a lazy bastage, LOL. 8 screws max Sheeesh

Speaks

Only 6. Do I get extra points?

badman · 29th August 2009, 07:24 PM

Quote:

Originally Posted by Lewis Moon

Only 6. Do I get extra points?

You're the champ- in the time this thread has taken you could have done it.

Volenti · 30th August 2009, 04:21 AM

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.

SaSi · 1st September 2009, 09:43 AM

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?

26th August 2009, 03:33 PM	#1
Lewis Moon diyAudio Member Join Date: Sep 2008	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.

26th August 2009, 03:36 PM	#2
badman Custom Title diyAudio Member Join Date: Sep 2003 Location: Sunny Tustin, SoCal	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. __________________ I write for www.enjoythemusic.com in the DIY section. You may find yourself getting a preview of a project in-progress. Be warned!

26th August 2009, 04:02 PM	#3
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	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. __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

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26th August 2009, 04:07 PM	#4
Lewis Moon diyAudio Member Join Date: Sep 2008	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.

26th August 2009, 04:57 PM	#5
Lewis Moon diyAudio Member Join Date: Sep 2008	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.

30th August 2009, 04:21 AM	#9
Volenti diyAudio Member Join Date: Aug 2003 Location: Australia	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.

1st September 2009, 09:43 AM	#10
SaSi diyAudio Member Join Date: May 2008	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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