Acousta-Stuf Polyfill - stuff it or fluff it

[mike12820]

After a few hours of testing my sweet newly finished Aviatrix speakers, I'm going to remove the bottom drivers and glue down my crossover board. One question I have is how the stuffing should be in the box. Should it be crammed in there, fluffed up, a mix between the 2 but uniformly dense etc.? I tried to uniformly distribute above and below the brace and hide the back wall, some spots are certainly thicker than others. On the bottom where the crossover is, coverage is less and I can see the back wall because I did not want to pack it down tight over the crossover.

Please advise!

Thanks,
Mike

[billfitzmaurice]

I assume it's a sealed cab. The only way to know precisely how much to use is to measure the Q of the cab with an WT3 or the equivalent. If below 0.8 only lightly fill the cab; you'd actually be better off lining it with an inch of poly or foam. If higher than 0.8 add enough to bring the Q down to between 0.7 and 0.8, compressing it if required.
If it's a ported cab you should be lining, not stuffing.

[carlspeak]

I'd think the original designer of the Aviatrix would have the best answer. He would have gone thru the steps needed to optimize the stuffing.

[billfitzmaurice]

I'd think the original designer of the Aviatrix would have the best answer. He would have gone thru the steps needed to optimize the stuffing.
Maybe. Was the Q value measured/published? I'm not being a wiseguy, I just don't know.

[cwad8505]

" I stuffed each speaker with about 8 oz. of
acousta-stuff, so figure 1 bag per pair of speakers."
This is quoted from Curt's website in reference to the MTM sealed. With that, I'd start with that amount evenly dipsersed inside the enclosure, making sure the fill is not touching the back of the ND drivers. From there, add or lessen to suit your tastes for your application.
Good Luck!
Chris

[DIYNut42]

If they are the sealed MTM's, I would pack the stuffing more toward the back, then make it gradually lighter/looser as it comes to the front. Be sure to keep some space between the back of the drivers, and the stuffing. Some stuffing touching the back of the magnet isn't a big deal.

If they are the MLTL towers, I found the best method when I built mine was to pack it heavier toward the bottom, and very gradually pack it looser as I moved to the top. I played around with different options, and this gave me the best results. To my ears the 1 Lb. per tower suggested was just right.

Hope this helps.

Ryan