FEATURES
Mulit-Zone , Multi-Source, Video Switching
The
AX4752
has four separate preamplifiers and amplifiers, providing 4 zones of independent yet
integrated control.
There are seven stereo sources (SAT, DVD, VID, AUX, CD, Tape & Tuner) and an eighth mono source
(Utility) typically used for paging applications.
Each zone has an eight source composite video switcher, so screen’s in four different rooms may
display any of the eight sources (SAT, DVD, VID, AUX, CD, Tape, Tuner & Utility)
Preamplifiers and outputs
Each zone has bass, treble, balance and loudness control. These are accessed either from the front
panel or AMC program.
The preamplifier output volume may be independent of the amplifier volume, or made to track the
amplifier with an adjustable offset (± 20dB). The tracking feature is great for passive subwoofer
control, while the independent volume feature is useful for limited control in close-coupled rooms.
A useful protection feature is ‘Maximum volume limiting’. This limits the maximum volume of either
the amplifier or preamplifier.
Amplifier Power, Protection, and Clipping indicators
50 Watts RMS per channel into 8 ohms, capable of driving into 4 ohms.
The amplifiers are protected against short-term output shorts.
There are three progressive levels of thermal protection:
1)
An internal fan is turned on to aid cooling.
2)
The amplifier volume is reduced 20dB.
3)
The amplifiers are shutdown until the temperature reduces below the first level.
Care should be taken to ensure adequate ventilation – see “installation guide”
The front panel zone indicators will flash red when the zone amplifiers are overdriven into clipping.
USB, RS232 & IR Control
The
AX4752
may be controlled and monitored via either the front Panel USB or rear panel RS232
serial interface.
In multi amplifier installations where the amplifiers are interconnected using an expansion bus cable,
only one USB or RS232 connection is required to control the stack of amplifiers.
An
AX4752
may receive IR directly from the front panel receiver or via the two ‘Controller interface’
connections.
There are zone specific IR commands and also a set of global IR commands.
The commands are: ON, OFF, Standby (toggling), Mute, Amp Volume Up, Amp Volume Down, Pre
Volume Up, Pre Volume Down, SAT, DVD, VID, AUX, CD, TA, TU, UTILITY, On with Source specific
commands.
The Global commands also include; PRESET1 – PRESET 6, Alarm Enable, Alarm OFF, & 5 minute Sleep.
Real time clock
The
AX4752
is equipped with a real time clock.
The amplifier may be set up to function as an alarm clock, so that at 6.30am in the morning 5 days a
week, the master bedroom zone could be made to turn on, select tuner, and go to a specific volume.
Another application of the clock is temperature and event logging, providing a history of the amplifier
environment which aids servicing.
The clock continues to operate typically > 48 hours without power – more than enough to keep the
time current during lengthy power outages.
IR Emitter Ports
There are 4 Buffered IR emitter Ports.
Two IR ports have routing, and are linked to their respective ‘Controller Interface’ ports. These ports
control zone specific source components.
Two IR ports are the sum of both IR sources; these control the all zone source components.
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