Each driver (speaker diaphragm) of the two 2-way speaker cabinets is controlled separately to ensure optimum reproduction of treble and mid-range frequencies.
The bass is reproduced by a mono subwoofer, which is driven by a power amp in mono-bridged mode. The sub-woofer receives its signal from the DCX's "SUM" input,
which is limited to bass frequencies and is the sum of mix signals In A+B. The unused input C and output 6 could be used for a mono delay line, for example.
A reference-class reverb modeler & an ultra high-precision digital 24-bit/96 khz eq/rta mastering processor & the ultimate digital loudspeaker management system (3 pages)