Having just installed the KSB2 in my 2nd K2, I was wondering if this was worth trying. I have had no complaints about my audio in the few QSOs I've had with it so far. http://jg1xlz.cocolog-nifty.com/blog/elecraft_k2_ssb_sound_imp.html I couldn't find any reference to it on this reflector. Comments? 73,Steve VE3SMA