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Hans
09-21-2004, 01:34 PM
Anyone who knows anything about the german 15" speaker Isophon P-38. I believe that it was manufactured in the late 60's or the early 70's. It has an Alnico magnet and I've found the free air resonance to be 40 Hz. I've got 4 of them and they are in good condition. Maybe I will build a pair of 2 x 15 PA speakers. Grateful for ideas!

Hans