Careful! Simply Speaker foam is WAY TOO STIFF for this series of 8" woofer. Free air resonance frequency measures at over 40Hz with a "restored" woofer. NEWFOAM is WAY TOO PERMEABLE to use...any "Acoustic Seal" is destroyed. I have one original 2000037 woofer with intact and pliable original foam. It is VERY thin and non permeable. Free air resonance is about 29Hz. I am beginning to wonder if the home diyer CAN restore these woofers to anywhere near original spec. As they were used with no cross