Rane MX 22 Operator's Manual - page 5
Manual is about: STEREO 2-WAY CROSSOVER
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Manual-4
APPLICATION — ACTIVE 2-WAY WITH (or without) MONO SUB
Use this configuration if you have separate speaker inputs for the low
and high drivers, regardless of whether they are in the same or
different cabinets.
Connect as shown for a mono subwoofer. Set the 100 Hz FILTER
switch to the IN position. If a mono subwoofer is not used, the
FILTER switch setting will not matter, since all low frequencies will
be sent to the LEFT and RIGHT LOW OUTPUTS.
The front panel LOW/HIGH FREQUENCY control determines the
frequency division between the low and high drivers, and only low
frequencies below 100 Hz will be sent to the mono subwoofer.