[Elecraft] SSB audio problem

[Bob Baxter]

My K2 #922 ssb audio has a very pronounced sibilance problem (like a
lisp).  The amount varies with different people speaking.  SF4 (dsp)
will cancel it out but that affects intelligibility, and I don't have
that much to spare.  SF1-3 don't have much effect on it and turning
the dsp off doesn't help.  I don't know how long this has been going
on as I haven't used ssb for a few years--I have a 50 pound Kenwood
that does ssb pretty well if I feel the need for it.  I haven't done
the matched crystal mod and I'm wondering if that will help.  Any
ideas will be appreciated.
--
Bob Baxter AA7EQ
Walnut Ridge, Ar.