Wayne Parham Messages: 18787 Registered: January 2001
Illuminati (33rd Degree)
You must be talkin' about the old Theater Series four Pi model. It was one of the most popular. I'll see if I can't dig up the plans.
For bonus points, modify that old design by upgrading the HF section to match the newer models. Install an H290C waveguide and use the tweeter section of the current crossover, using the same R1/R2 values as you have now. The crossover is almost the same as it was back then, so only minimal changes are needed.