Rear Panel Connection Details - Cambridge Audio 840A v2 Manual

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Table Of Contents

Table of Contents

Cambridge Audio Azur 840A v2 Amplifier

Rear panel connections

Power On/Off

Switches the unit on and off.

AC power socket

Once you have completed all connections to the amplifier, plug the AC

power cable into an appropriate mains socket then switch on. Your

amplifier is now ready for use.

Loudspeaker terminals

Two sets of loudspeaker terminals are available, A (main loudspeaker

terminals) and B (secondary loudspeaker terminals). Both sets of

speakers can be turned on and off independently. Connect the wires

from your left channel loudspeaker to the LEFT + & - terminals, and the

wires from the right channel loudspeaker to the RIGHT + & - terminals.

In each case, the red terminal is the positive output and the black

terminal is the negative output.

Care should be taken to ensure no stray strands of wire short the

speaker outputs together. Please ensure that the loudspeaker terminals

have been tightened completely to provide a good electrical connection.

It is possible for the sound quality to be affected if the screw terminals

are loose.

Note: When using one pair of speakers, use speakers with a nominal

impedance of between 4-8 ohms. When using two pairs of speakers,

use speakers with a nominal impedance of between 6-8 ohms. Please

also note that when multiple speakers are connected across the

amplifier's outputs, the load (as seen by the amplifier) is reduced. This

will make the amplifier work harder, and hotter!

IR (Infrared) Emitter In

Allows modulated IR commands from multi-room systems to be received

by the amplifier. Commands received here are not looped out of the

Control Bus. Refer to the 'Custom installation' section for more

information.

Control Bus

In - Allows un-modulated commands from multi-rooms systems or other

components to be received by the unit.

Out - Loop out for control bus commands to another unit. Also allows the

840A V2 to control some Cambridge Audio units.

RS232C

The RS232C port allows external serial control of the 840A V2 for

custom install use. A full command set is available on the Cambridge

Audio website at www.cambridge-audio.com. This port can also be used

by Cambridge Audio service personnel for software updates.

A-BUS™ Ready / Incognito Ready™

multi-room outputs

PSU - Connect an Incognito PS5 to supply power to the connected multi-

room keypads/speakers.

Keypad 1/ 2 - Connect one or two Incognito A-BUS KP10 keypads (or

other A-BUS compatible keypads) using CAT5/5e cable. Incognito AS10

Active Ceiling Speakers can also be connected here.

IR - Four IR outputs for remote control of source equipment.

Please refer to the 'Multi-Room' section of this manual for more

information on connections and set-ups.

Input 1 features either unbalanced (phono/RCA) or balanced (XLR)

connections. Either type may be used but not both at the same time. The

balanced connection is the higher quality option and can reject noise

and interference in the cable when used with other equipment that

supports this function. An XLR connector is wired Pin 1 - Ground; Pin 2 -

Hot (in-phase); Pin 3 - Cold (phase-inverted).

Use the Balanced/Unbalanced switch (Item 9) to select the connection

type you wish to use. When using either the balanced or unbalanced

input, make sure that no cables or equipment are connected to the

unused input, as this may degrade operation. The unused input does

not require to be terminated and this should not be done.

Use to select the connection type for Input 1.

These inputs are suitable for any 'line level' source equipment such as

CD players, DAB or FM/AM tuners etc.

Note: These inputs are for analog audio signals only. They should not be

connected to the digital output of a CD player or any other digital device.

Connect to a tape deck or to the analog output sockets on a MiniDisc,

portable digital music player or CD recorder using an interconnect cable

from the recorder's Line Out sockets to the amplifier's Tape In sockets.

The Tape Input circuit of the 840A V2 is a "monitor" type, different from

the other 7 inputs. For the 7 normal inputs, the source selected for

listening to will be sent out of the Tape Out for recording. The source

currently being listened to and (optionally) recorded is then shown on

the front panel display.

However, when the Tape Input is selected a solid circle will appear

beside TAPE MON indicating that the Tape Input is now being listened to

with a different source being sent out of the Tape Out for recording. The

recording source is also shown by a solid circle by the selected input and

can be changed by pressing the other source buttons. To switch Tape

Monitor off, simply press the Tape Mon input select button again,

toggling this function off.

This feature is most useful when using 3-head analog cassette decks

which allow the signal being recorded to be played back live off tape (via

a 3rd head) whilst it is simultaneously recorded. It is then possible by

toggling the Tape Monitor input on and off to compare directly in real

time the original and recorded signal so that adjustments to the

recording parameters of the tape machine can be made (consult the

manual of your 3-head analog cassette deck for full details).

Connect these sockets to the inputs on an external power amplifier(s) or

active subwoofers etc.