OPERATION
The HDDS Master Control Module is the Master control center for distributed sound
systems using the HDDS technology. The Master Control Module includes six zones
that can be used independently or can be linked to work together allowing the system
designer the flexibility to set up any system with the desired configuration. The block
diagram below shows the basic configuration of the SM650 Surface Mount Speaker.
The speaker receives power and audio over a Cat5 cable connected to the Master
Control Module, internally converts the AC power to plus / minus 15VDC and 30VDC to
power the amplifier. The audio signal is fed to a precision differential amplifier to
remove any common mode noise, filtered with a crossover circuit to produce a low pass
and high pass signal, equalized and fed to D-CAT power amplifier circuits to drive both
the woofer and tweeter in the speaker. The speaker includes an onboard level
adjustment that allows simple balancing of installed systems.
The HDDS SM650 is available is both black and white. Both models include a front
mounted blue power indicator LED, which illuminates when power is on.
