As I mentioned earlier, it is very likely that the surround has become significantly stiffer over the years (it happens with this material, which is unlike your typical modern rubber material).
Same happened to my pair of Seas P17RCY, Fs measured the double. This is quite typical to older Seas drivers, and most probably not only Seas. I used them as midrange.
Hi, As USXX and Pida says, it probably is the surround material that has hardened up with age, I have experienced quite a few of the old vifa models that had similar problems, you could try fitting new surrounds (either rubber or foam) to them so that you then have some usable drivers.
Arthur.
Arthur.
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