Hi, I've kind of dabbled making a few crossovers from other members posts. Many years ago I made what I think is a high pass filter for a JBL 2404H to add it onto A Belle Klipsch as a supertweeter? THe schematic came from "The Audio Engineering League" although the links are no longer active. I'm wondering if someone experienced can fook at the schematic and tell me exactly what it is and does i.e. is it a 12 or 18 db? and what is the cutoff (like 5 or 10 khz)? Thanks for any info.