1 TommWilliams 11 months ago I recently acquired a fully functioning 1956 model 6163 chassis that I want to put back together. I see they originally came with a Jensen P15N and some sort of a 4" tweeter. Did these amps employ some sort of crossover unit or such for the 4"? I can't imagine them lasting long or sounding very good with a full range signal. 4" speaker selection isn't much so I might do something different like a 12" and an 8" since I have a pair of such Jensens laying around. Right now just curious about the 15"/4" operation before I take it much further.