Modeled stuffing in WinISD (I think). Thoughts? - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 7 Old 11-16-2019, 05:36 PM - Thread Starter
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Modeled stuffing in WinISD (I think). Thoughts?

In my build post, I talk about some of the snafu's I've encountered during the build, specifically the addition of polyfill (dual 6 cubic foot sealed boxes, with about 5.75 internal volume). I started to think if I needed it in the first place, as more than a few said I didnt. I have read countless threads about using fill in the first place (Ricci's article was really good). Anyways, I modeled my driver (FiCar Audio HT-3) to see the difference if I added fill or pillows verses nothing.

Red
No fill
5.75 cubic foot
Fsc - 34.74 hz
Qtc - 0.689
109 db @ 20 hz

Blue
Fill to get to about 5.33 cubic foot (so a little less than 1/2 pound)
Fsc - 35.55 hz
Qtc - .703
107.8 db @ 20 hz

I am unsure about what the impedance model means or how to read it. I am leaning towards not using any fill at all, or possibly one small pillow. What say any of you?
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post #2 of 7 Old 11-16-2019, 05:45 PM
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if using with standard 80hz crossover, i don't think your enclosures are large enough to have internal resonances in that range, so do whatever makes you feel best. :-) seriously, if you feel they will sound better with stuffing do that. if not, don't.

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post #3 of 7 Old 11-16-2019, 05:55 PM - Thread Starter
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Originally Posted by LTD02 View Post
if using with standard 80hz crossover, i don't think your enclosures are large enough to have internal resonances in that range, so do whatever makes you feel best. 🙂 seriously, if you feel they will sound better with stuffing do that. if not, don't.
Are you talking about the 80hz crossover that I’ve set on my AVR?
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post #4 of 7 Old 11-16-2019, 06:00 PM
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Quote:
Originally Posted by ratm View Post
Are you talking about the 80hz crossover that I’ve set on my AVR?
yes, if you were going to run them up to something like 140 or 160Hz, then i'd need to take a more careful look. for 80hz, no stuffing is needed in a box your size if it is roughly square (not a long tube type enclosure).

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post #5 of 7 Old 11-16-2019, 06:12 PM - Thread Starter
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Quote:
Originally Posted by LTD02 View Post
Quote:
Originally Posted by ratm View Post
Are you talking about the 80hz crossover that I’️ve set on my AVR?
yes, if you were going to run them up to something like 140 or 160Hz, then i'd need to take a more careful look. for 80hz, no stuffing is needed in a box your size if it is roughly square (not a long tube type enclosure).
Nope, all my speakers are set to small, so it’s at 80hz. Thanks John for all of your help.
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post #6 of 7 Old 11-17-2019, 04:14 AM
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Quote:
Originally Posted by ratm View Post
In my build post, I talk about some of the snafu's I've encountered during the build, specifically the addition of polyfill (dual 6 cubic foot sealed boxes, with about 5.75 internal volume). I started to think if I needed it in the first place, as more than a few said I didnt. I have read countless threads about using fill in the first place (Ricci's article was really good). Anyways, I modeled my driver (FiCar Audio HT-3) to see the difference if I added fill or pillows verses nothing.

Red
No fill
5.75 cubic foot
Fsc - 34.74 hz
Qtc - 0.689
109 db @ 20 hz

Blue
Fill to get to about 5.33 cubic foot (so a little less than 1/2 pound)
Fsc - 35.55 hz
Qtc - .703
107.8 db @ 20 hz

I am unsure about what the impedance model means or how to read it. I am leaning towards not using any fill at all, or possibly one small pillow. What say any of you?
Made a small calculation in another program that I know corresponds to 90% it shows measurements that have been made.
look at viso% which shows how many% filling there is in the box.
And how it changes on Effective vb.
And Q in closed box.
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post #7 of 7 Old 11-23-2019, 04:18 AM
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