The MSW-2 operates as a system with the B-2EX Control Electronics Unit (one per channel). Optimized for use with Meyer Sound subwoofers, and pre-aligned at the factory, the B-2EX contains frequency response and phase response alignment circuitry, and Meyer Sound’s exclusive SpeakerSense™ driver protection circuitry, incorporating RMS signal limiting and switchable excursion limiting.
A single-channel device operating at line level, the B-2EX is intended to be the final component in the signal chain before the power amplifier. It is connected in parallel with the input to the system being supplemented by the MSW-2, and incorpo- rates a summing input for deriving a mono subwoofer signal from a stereo program.
The factory-calibrated SpeakerSense circuitry protects the MSW-2 loudspeaker components from damage due to over- heating under high power conditions. This unique circuit continuously monitors the power applied to the MSW-2 drivers, and limits the B-2EX output when the safe operating limits of the drivers are ex- ceeded. Until the onset of overload, the SpeakerSense circuitry has no effect on the B-2EX output signal.
Included in the SpeakerSense circuit is a Safe switch, which moves the limit point downward from the factory setting and engages the excursion limiter. This has the effect of increasing the safety margin of the system, and is intended to be used when extended periods of overload are antici- pated. In addition to these features, the B-2EX incorporates a Crossover switch which engages/disengages the lowpass rolloff of the subwoofer output. This feature may be used whenever it is desirable to operate the MSW-2 full-range as, for example, in instrument amplification.
The setup controls are located behind a cover plate on the B-2EX front panel, providing a means for securing the system installer’s presets.
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