The completed x-overs for Lou C.'s "Topaz" design; low-pass on top (1st order) and high-pass on bottom (2nd order w/zobel). These will be a birthday present for a friend. He has some old cabinets that are very solid and useable (3/4" MDF walls, 13 liters volume), but the original drivers are rotted out. Also, the original x-over was just a tiny, board-level, capacitor, about 3/8" long, and as big around as a pencil! The woofer ran full-range, with no filter. Such nice old cabinets using very crappy drivers...what a shame. I just happen to have the Definitive 6.5" woofers (see previous pics of the Focal speaker) and I bought some Audax tweeters when they were on sale a while back. This was before I was told about Lou's site, so fate intervened as to how I would use these drivers. All I have to do is make a new front baffle to properly fit the Audax/Definitive into their new enclosure.