Crane Song AVOCET II - Manual (Page 14)

14
Shift Mode Output 3 Mode
as sub woofer on-off
Shift to select control
With this button selected in the shift mode. OUT 3 is converted to work
as a Sub Woofer output. It is full range unfiltered audio that can be
turned ON or OFF with OUT 3. Thus allowing outputs 1and 3, or 2 and 3
to be on at the same time. If this is not selected, OUT 3 works as a
normal third speaker system output
Output 3 does not provide any filtering or mono summing. Using this as
an output to turn a sub woofer on or off assumes that either there is
external summing and filters for the sub woofer or that there is stereo
sub woofers with filtering which is a better method.