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MITCHELL
STEREO ANALOG ELECTRONIC CROSSOVER
REVISION P
RB
– DECEMBER 2020
Copyright © 2020, M2Tech Srl
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and a tweeter takes treble into charge, an electronic crossover should provide two low
pass cuts at different frequencies and a high-pass cut, which are not possible with
standard three-way electronic crossovers.
The Mitchell elegantly solves this problems by providing six filter modules (three per
channel in stereo or all six for one channel in mono) each one can be set as low-pass,
band-pass or high-pass independently.
Each filter module is composed by various blocks which can be composed in a lot of
different fashions to make a large number of different filters:
one all-pass filter for phase and delay shaping;
one 1-pole low-pass filter;
one 1-pole high-pass filter;
two 2-pole state variable filters;
one gain block;
two inversion blocks.
Figure 3 shows the block structure with all possible connections selected by various solid-
state switches and multiplexers set by the 4-digit hex number sent with the SP command
(see 8.1.5). The gain block is not displayed as the gain function is located on the
mainboard.
Figure 3: Filter Module Structure
Let's see in details the features of each block.
