ISP Technologies HDDS BRC1 - Manual (Page 6)

Principles of the Master Control Module operation:
The HDDS BRC1 allows connection of a stereo source via the rear panel Left / Right
RCA input connector. A second input on the front panel allows connection for any
external 1/8 inch RTS jack for connection to an IPOD, mp3 player or Computer Audio
connections. When a jack is plugged into the 1/8 connector on the front panel it will
defeat any audio connected to the rear stereo RCA connectors on the back panel.
Power from the included external 18VAC adaptor is internally converted to +/- 22VDC
and fed to the output RJ45 connectors providing the Left and Right outputs. When
power is applied to the BRC1, the front panel power LED will illuminate. Cat5 cable is
used to connect the BRC1 Left and Right RJ45 outputs to any of the HDDS series
speakers. The BRC1 allows connection via the Remote Level port on the front panel to
an external Remote Level Control, HDDS RM10. The Remote Level Control is a 10-volt
DC control connected over a Cat5 cable to a simple potentiometer that adjusts a DC
voltage fed back to the internal Voltage Controlled Amplifiers (VCA). This means that
no audio is fed down the cable and a single DC voltage is used to simultaneously adjust
both the Left and Right output levels. The rear panel also includes a Phoenix style
connector providing a MUTE function. The connector provides a ground connection at
Pin 1 and a MUTE trigger signal at pin 3. When the trigger line (pin 3) is pulled to
ground the BRC1 will mute both the Left and Right outputs.
The power adaptor supplied with the BRC1 is capable of driving two to four speakers
with a total of 40 watts. If more power is required for a specific application a high-
output 18-volt power adaptor is available from ISP Technologies, which can provide
higher output current, thus providing more power per speaker.
The front panel Master Level control is the “Zone MASTER” and sets the system
maximum level while the front panel Remote Level control will only allow adjustment
from a minimum setting to the maximum level set on the front panel Master Level. This
allows the Master Control Module to be placed in a location where access to the Master
Level can be restricted and yet allow Remote Level access at a remote location.
SPEAKER POWER:
The HDDS BRC1 distributes low voltage Direct Current over the Cat5 cable plus high
level balanced audio and is capable of 40 watts continuous power in total. An external
power adaptor may also be connected to each external speaker’s power connector as
an alternative option thus allowing for higher levels of total system power if required.