|Long-Tailed Phase Inverter Speaker Cabinet___________________________|
An early transmission line speaker design, the precursors of these are mentioned in a thread at Audiokarma. I included suggestions for laying out the cuts in that thread, though the dimensions are slightly off. Maybe I'll clean that up in the future.
I built three sets of these in 1966, two for friends, using various drivers. My set used a mid-price University 10" with a whizzer cone.
Original plans from the September 1966 Popular Electronics article and Allied catalog pages from 1966 and 1971 for the original driver, for your perusal.