Menu settings used at W2BLC for armchair copy on 160/75/40 meters:
The following are the settings I am using on 40, 75, 160 for armchair
copy (meaning very reduced hiss and no ANF warbling). My RX audio goes
through amplified Behringer studio speakers with bass/treble
The speaker adjustments: bass at 3 o'clock and the treble at 11 o'clock
K3 settings (Config Menu):
AGC DLY - NORM
AGC HLD - 0
AGC PLS - NORM
AGC SLP - 4 to 6 (low setting reduces artifacts from the Automatic Notch Filter)
AGC THR - 12
AGC F - 120
AGC S - 20
Shift - 1.25
Width - 2.7
RF Gain - 90 (sometimes less)
ATT - ON
RX EQ 1 -2
Be sure to read the "Noisy K3" section on
http://www.w3fpr.com/ - excellent information!
The disclaimer: Your mileage for the above settings may vary - depending upon speaker selection, personal preferences, and your hearing acuity.
Note: I made all of my settings by hand, using the K3 menus. I did NOT use K3 EZ as that program will sometimes upset the AGC settings.