ELECRAFT K4 - Page 106

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RX 1.5 MHz High-Pass Fil.
Controls the setting of the per-receiver 1.5 MHz high-pass filter when
the 160 m ham band is in use (1.8-2.0 MHz). By default this high-pass
filter is disabled, maximizing receiver sensitivity on the 160 m band. If
the high-pass filter is enabled, sensitivity on 160 m with preamp off
drops by about 3 to 4 dB. This setting may be useful if you have a
nearby strong AM broadcast station nearby in the 0.5 to 1.5 MHz
range.
RX All-Mode Squelch
Used to enable or disable squelch in non-FM modes.
RX Audio Mix with Sub ON
Specifies what mix of main/sub receiver audio will be sent to the left/
right audio channels. This setting only applies if the sub receiver is ON
and stereo audio is being used, i.e. stereo headphones or dual
external speakers.
The main/sub mix setting is not to be confused with left/right audio
balance ([BAL] control, the hold function of the {RF/SQL} knob).
Balance specifies the relative volume level of the left and right audio
channels. The balance setting applies regardless of how main and sub
receive audio is mixed left and right, and it applies even with the sub
receiver off, providing comfortable listening levels for operators with
different hearing sensitivity in each ear. When working with the audio
mix menu entry, at least initially, it may be helpful to normalize the
balance to 50/50 to avoid conflating its effect with that of the audio
mix.
Changing the mix is especially useful for SO2V operation (Single
Operator, 2 VFOs). In the SO2V case, external host software is
typically used to rapidly change the mix settings by using the K4's
"MX" remote-control command. For details, refer to your host
software documentation and the K4 Programmer's Reference.