ISP Technologies SM 800 - Manual (Page 4)

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 HDDS SM800 Surface Mount
Speaker. The speaker receives power and audio over a CAT6 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 DAAT Dynamic Adaptive
Amplifier power amplifier circuits to drive both the woofer and tweeter in the speaker.
The woofer section will dynamically increase the positive and negative power supply
rails as required based on the audio signal. The output swing can exceed 120 volts and
can deliver over 220 watt continuous output power. The HDDS SM800 includes a rear
panel level adjustment that allows simple balancing of installed systems.
The HDDS SM800 requires connection to the Master Control Module with CAT6 cable in
order to handle the current of the HDDS SM800. The output connection can be used to
connect to not more than one additional HDDS SM800. Connecting more than one
additional HDDS SM800 can exceed the maximum output current available per output
of the HDDS Master Control Module and may trip the internal resettable fuses in the
output circuit.
DO NOT CONNECT THE CAT6 INPUT CABLE BETWEEN THE MASTER CONTROL MODULE AND
THE INPUT OF THE HDDS SM800 SPEAKER WHEN THE POWER ON THE MASTER CONTOL
MODULE IS SWITHED ON! THE MASTER CONTROL MODULE MUST BE SWITCHED OFF PRIOR
TO CONNECTION. THE HDDS SM800 MUST BE POWERED ON WITH SYMETTRICAL POWER IN
ORDER TO CHARGE BOTH POSITIVE AND NEGATIVE INTERNAL POWER SUPPLIES. FAILURE TO
POWER DOWN THE MASTER CONTROL MODULE PRIOR TO CONNECTION TO THE HDDS SM800
MAY CAUSE POSSIBLE DAMMAGE TO THE HDDS SM800 OR THE CONTACTS PINS OF THE CAT6
CABLE DUE TO LARGE NON-SYMETRICAL INRUSH CURRENT.