Although it's a tardy response, better late than never! The main problem with fiberglass insulation is the DUST. The aforementioned turbulance can cause fiberglass particles to impact the back of the cone, or to (eventually) find their way into the driver's voice coil. Someone (don't remember who) makes a 1" thick, unbacked roll of fiberglass insulation, which is lightly spray-coated with a sealant to prevent dusting. It's still not as good as polyfill, but it's a lot cheaper, and is still a vast improvement over the ol' R19!
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