The "wool" is an internal damping upgrade, suggested by Louis. Maybe Louis could explain for us. I just asked him if there were any upgrades he would recommend.
I am using a Teac integrated amp at the moment, with an old Oppo player. It will only play Mp3's. Those are both going to be replaced very soon.
But even so, these speakers sound wonderful. At the low levels I am listening, they are clear detailed, the sound floats in mid air. I wanted the fuller sound of an 8 inch driver over the others offered. The bass that I am getting is more than I need. Too much bass can give me nightmares.
Thanks for the comments.
And again, my thanks to Louis. Very happy with my speakers.