MX-4 Electronic Controller

The Martin MX4 is an advanced electronic controller which will
optimize the performance of any Martin active 2,3 or 4-way system. It
can be used, for instance in its 2-way stereo mode for the VRS system,
or as a 3 or 4-way mono unit for an F2 or F1 system.

Crossover frequencies, basic output le...