[Elecraft] Audio Improvements on a K2

[ZOOM]

Hi All;

I really like my K2 but would like to improve on the SSB audio.  My K2 is
unmodified and I would like to hear from the list which  improvements you
have made to make the K2 sound better in SSB reception.  I have done the
spectrogram and my K2 has all the options except the RS232 option.  I know
there are several mods out there for this rig but I only want to do the ones
that are essential to improve audio.

My second question is that i am using a radioshack mike and am told my
transmit audio is too much on the high side.  What mike seems to work well
with the K2 and give a nice signal?
I understand the Hiel offered by Elecraft is a good match but also
interested in hearing about others.  Could the high pitch sound be caused
also by my set-up?  I use SSBA=2 and SSBC=2-1 with a stoch RS mike cat #
21-11720 cb dynamic microphone.
Anyone using this mike with good success?

I hope to hear from some of you soon and thank-you for your efforts,
Robert
VE3RPF