Volti does it, but they use brass cones and dishes, which would be much better than purple foam.
Klipsch Lascala II bin separation
A unique feature of the newer Klipsch Lascala II and AL5 is there are two bins, top and bottom (or HF and LF bins). Recently I put a cut up Purple seat cushion between the two sections and the clarity jumped significantly. Everything is better, very much better. Has anyone ever tried to seriously isolate the two bins? Is this a thing I just never heard of or is this a commonly known deal? The improvement is so huge I thought someone out there would have sounded the trumpet long before now. Sorry if I'm late to the party.....