Isophon had some drivers with corrugated paper surrounds and high FS values designed for open baffles in German consoles. The PSL series was high compliance with soft surrounds and low Fs designed for closed air suspension boxes.
For the PSL series crossovers were simply a 1.5 mH inductor in series with the woofer, a 15uf polarized electrolytic in series with the mid, and a 1.5 uf in series with the tweeter. My speaker circa 1972 was an Isophon PSL245 10" woofer, an Isophon BPSX130 5" Mid and the infamous Philips AD0160 plastic dome tweeter with the crossover described above. The only difference was I had obtained better caps from my electrical engineering lab in college.
They usually came in 4 & 8 ohm versions.
What Phukips were called in the US because of trademark issues.
dave
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