I've posted a new design I've been working on for a few months off-and-on. This one is a fully shielded design intended for home theater use - i.e., with a subwoofer. It uses the Seas P17RE/TV and 27TDFC/TV drivers in a sealed box. The ~80Hz F3 and second-order roll-off should blend well with a subwoofer using the crossover on most receivers and pre-pro's. Check my link below.