The Theater Series six π uses a 12" woofer. I don't have any other current π cornerhorn designs that use 10" or 12" woofers.JBL Professional Series woofers have shorting rings that reduce distortion considerably. Eminence woofers sound very good, but they don't have shorting rings. If you need maximum SPL, Kilomax drivers have some advantages over JBL, but if you want highest quality sound, the JBL's have a bit of an edge because of flux stabilization from their shorting rings.