Thanks for the compliments. I heard the Billie last year in Lima - very nice - I'm about to start a scratch built 300B SET based on the WE91 circuit but if I was going to build a kit, the Billie would be it. Heard the Paramours a few times as well - they sounded great but they are only 2.5w - the right speakers are critical.XO is the stock Altec unit that came with these drivers. The boxes are vented (triangular cut-outs in the cabinet sides) - tuned to 40Hz.
Billfort