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The 840W features a Control Bus input/output
that allow un-modulated remote control
commands (positive logic, TTL level) to be received
electrically by the unit and looped to another unit
if desired. These control commands are typically
generated by custom installation (multi-room) systems or remote IR
receiver systems. The Control Bus sockets are colour-coded orange.
An IR Emitter Input is also provided that allows modulated IR remote
control commands to be received electrically by the unit. Commands on
this input operate the unit only and are not looped out demodulated on
the Control Bus Output.
The unit responds to ‘direct’ IR/Control codes as well as toggle codes for
some features to simplify programming custom installation systems.
Special direct On/Off and Mute commands can be accessed from the
840E pre-amplifier remote control for teaching into C.I. systems as
follows:
1. Press and hold the Standby/On button. The remote first generates a
standby (toggle) command. Keep the button held down, after 12
seconds an amplifier “On” command will be generated. If the button
is kept held down for a further 12 seconds, an amplifier player “Off”
command is generated.
2. Press and hold the Mute button. The remote first generates a mute
(toggle) command. Keep the button held down, after 12 seconds a
“Mute on” command will be generated. If the button is kept held
down for a further 12 seconds, a “Mute off” command is generated.
These commands are recognised by the 840W via the IR Emitter input.
A code table for this product is available on the Cambridge Audio
website:
www.cambridge-audio.com
Custom installation (C.I.) use
IR Emitter
In In Out
Control Bus
Power Output - Stereo/Mono 200W per channel 8 Ohms
350W per channel 4 Ohms
Power Output - Bridged Mono 500W 8 Ohms
800W 4 Ohms
THD (unweighted) < 0.001% 1kHz
< 0.005% 20Hz - 20kHz
Frequency Response 5Hz - 80kHz -1dB
S/N ratio (ref 1W/8 Ohm) > 90 dB (unweighted)
Sensitivity Stereo or Mono =
(for 200W 8 Ohms) 1.5V rms unbalanced
1.5 + 1.5V rms balanced
Bridged Mono =
0.775V rms unbalanced
0.775V + 0.775V rms balanced
Input impedances Balanced input 38 kOhm
Unbalanced input 68 kOhm
Damping factor > 125 at 1 kHz
Trigger In 5 - 12V AC or DC
Trigger Out 12V DC @ 100mA
Power consumption Maximum 2400W
Active (no signal) < 180W
Standby < 5W
Dimensions (H x W x D) 148 x 430 x 365mm
(5.8 x 16.9 x 14.4”)
Weight 19.1kg (42.1lbs)
Technical specifications