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Quote:
Originally Posted by omegaslast  /t/1419597/what-should-i-use-for-stuffing-in-dual-opposed-sealed-boxes#post_22205376


Do i even need to use anything?
What's system Q? If higher than 0.8 add pillow stuffing to lower it. If not just line the cab to damp harmonics.
 

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Quote:
Originally Posted by omegaslast  /t/1419597/what-should-i-use-for-stuffing-in-dual-opposed-sealed-boxes#post_22207155


Are there T/S for the MFW-15 drivers? Is it the same as dayton DVC15?

I assume the Q will be closer to .7 then .8

>MrKazador is there something less irritating to throat/ears than fiberglass i could use? I have a pound or two of polyfill..
Your box modeling program should tell you the final system Q.As for home insulation fiberglass, avoid it. Polyfill is the right stuff.
 

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Discussion Starter #6
Doh


Re 3.04 Ohms

Le 2.07 mH

QM 6.62

QE 0.34

QT 0.32

Xmax 13.02 mm

Pe 225 Watts

Bl 14.08 Tm

fs 15.0 Hz

Mms 235.2 grams

Mmd 221.6 grams

Cms 0.476 mm/N

Rms 3.356 N sec/m

Vas 458.9 litres

SD 823.7 cm^2

VD 1072.3 cm^3

EBP 44.1

SPL 88.5

Z 4 ohms



using these^ I got .88 Q in winisd... so i guess i need quite a bit of polyfill to get that under .8


Should i buy those pillows from walmart? (whatever theyre called)
 

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Quote:
Originally Posted by omegaslast  /t/1419597/what-should-i-use-for-stuffing-in-dual-opposed-sealed-boxes#post_22207293


I got .88 Q in winisd... so i guess i need quite a bit of polyfill to get that under .8
Not that much, fully stuffed would probably take the Q down to well below 7.
 

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Discussion Starter #9

Quote:
Originally Posted by Scott Simonian  /t/1419597/what-should-i-use-for-stuffing-in-dual-opposed-sealed-boxes#post_22207351


Nah. You're cool. I have Unibox set for walls lined (stuffing) and I get a .82 Qtc and that's right at the sweet spot for excursion control. 300w safe per driver.

Are they hooked in series, parallel or powered separately?

Depends on how the ashly KLR-3200 likes driving them
 

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Quote:
Originally Posted by Mrkazador  /t/1419597/what-should-i-use-for-stuffing-in-dual-opposed-sealed-boxes#post_22208116


Why avoid insulation?
It falls apart, and the resulting pieces can get all tangled up in the driver. The only fiberglass that should be used is rigid Type 700.
 

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where can i find more info on polyfill: why use it and how?
 

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Quote:
Originally Posted by caper_1  /t/1419597/what-should-i-use-for-stuffing-in-dual-opposed-sealed-boxes#post_22208669


where can i find more info on polyfill: why use it and how?
In a sealed cab with a Q of higher than 0.8 adding polyfill will lower the Q, when tightly packed by as much as 0.2. This shows what that does to response, blue trace before, red after:
 

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I can't say what it will take in terms of weight but with the fairly low starting Q you have I'd fill the cab completely, compressing it only slightly. The only way to know if more than that is beneficial is to measure the results; if a response hump remains try adding more and see what happens. You also can measure the finished cab Q with a WT3 or the equivalent, adding more stuffing until it gets to 7 to 7.5.
 
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