How much polyfill?

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mazeroth

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Joined 2004
Bought 2 bags of polyfill from Jo-Anns for $3.99 each for a 16oz bag. It's in a roll so it should make gluing/stapling it easier. This is going in my line arrays and I'm not sure how much I should start out with for testing. They have 2 compartments with 5 Dayton RS5 drivers in each. Each compartment is 0.8 cubic feet, tuned to 65hz with a 2.875" port. The compartments are 5.5" wide, 11" deep and 27" tall. I'm thinking of a thick layer on the back wall with a thin layer on the sides, top and bottom. What do you guys think?

Thanks!
 
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mazeroth

Member
Joined 2004
I should probably add I'm doing this to kill the internal waves in the cabinet, not to trick the box into thinking it's bigger. Would I be better off using some sort of foam on the side walls, or as I have read in other threads, the roofing material they sell at hardware stores?

Thanks!
 
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Tim Moorman

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Joined 2002
I'd start off with about 6 oz in each compartment spread equally around the box. I leave the back or front temporarily removeable and just clamp back into position with wood clamps/duct tape until both the stuffing density and port tuning sound right.

I adjust both to taste with music and test tones playing. The woofer suspension takes a day or two to loosen up, so don't do anything permanent until then. Pump music or low frequency tones through them all day/night first.

Experiment, too, with sealing the port and leaving the back off.
Won't go as low but you may like sound quality better.

Tim
 
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