ELECRAFT K4 - Page 107

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The default audio mix is "L=A,R=B", providing full stereo separation
with left audio=main and right=sub (see table below). Here, "A" (VFO
A) is synonymous with the main RX, and "B" (VFO B) with the sub RX.
Mix Left Audio Right Audio Descr.
L=A,R=B main sub Default
L=AB,R=AB main+sub main+sub Mono
L=A,R=-A main main(-) Binaural*
L=A,R=AB main main+sub Hybrid
L=AB,R=B main+sub sub "
L=AB,R=A main+sub main "
L=B,R=AB sub main+sub "
L=B,R=B sub sub No main
L=B,R=A sub main L/R swap
L=A,R=A main main No sub
*The setting "L=A,R=-A" puts main audio on the left and polarity-
inverted main audio on the right, providing an interesting binaural
audio effect.
RX Auto Attenuation
When the parameter is set to On, the K4 will automatically reduce
receiver front-end gain if signals above the usable dynamic range are
present. When this happens, the attenuator icons will indicate the
amount of inserted attenuation. In addition, the preamp will be
turned off if necessary.
Whenever such signals are present, the S-meter's "+60" label will
briefly change to "OVF" (in magenta). If automatic attenuation is
disabled, you can manually reduce front end gain (e.g., by turning the
preamp off, or attenuator on).
Note: The RF gain control sets digital gain within the DSP; it does not
affect front-end gain. To reduce front-end gain (ahead of the ADC),
you must change preamp and/or attenuator settings.