Cambridge Audio 840A user manual Balanced audio connections

840A Class XD integrated amplifier

Balanced audio connections

The diagram below shows how to connect the 840A to the Azur 840C Upsampling CD player using the Balanced Audio inputs via three-pin XLR connectors (Note: the 840A can also be connected to non-Cambridge Audio sources with balanced outputs).

Balanced connections in an audio system are designed to reject electrical noise, from power wiring etc, and also the effects of noise currents flowing through ground connections. The basic principle of

balanced interconnection is to get the signal you want by subtraction, using a three-wire connection. One signal wire (the hot or in-phase) carries the normal signal, while other (the cold or phase-inverted) carries an inverted version. The balanced input senses the difference between the two lines to give the wanted signal. Any noise voltages that appear identically on both lines (these are called common-mode signals) are cancelled by the subtraction. An additional advantage is that the connection effectively carries twice the signal level and so improves the signal-to-noise ratio.

The 840A and 840C are designed to work at their highest performance when a balanced interconnect is used; high quality stereo XLR to XLR interconnects should be used.

840A

Power

Designed in London, England

On Off azur 840A Class XD™ Integrated Amplifier

www.cambridge-audio.com Power Rating: 230V AC ~ 50Hz

Max Power Consumption: 800W

Manufactured in an ISO9002 approved facility

Power AC

Caution Risk of electric shock. Do not open.

Avis Risque de choc electrique. Ne pas ouvrir.

Achtung Vorm öffnen des gërates. Netzstecker ziehen.

N2409

+

Right

Right

_

+

Right

Right

_

A

A

Loudspeaker Terminals

Impedance 4 - 8 ohms

B

B

Multi-Room

Input 1 Balanced Audio

GND

+

Keypad 1

IR1

IR3

Left

Right

Left

IR Emitter

Control Bus

_

In

In

Out

RS232C

PSU

Left

In

Keypad 2

IR2

IR4

Left

Right

Out Preamp

Out Tape

In Tape

7 Input

6 Input

5 Input

4 Input

3 Input

2 Input

1 Input

+

Left

Left

Left

Left

Right

_

Right

Preamp Out

Tape Out

Tape In

Input 7

Input 6

Input 5

Input 4

Input 3

Input 2

Input 1

840C

Power

On Off

Mains Voltage Selector Switch

115V/230V AC~50/60Hz

Power AC

N2409

azur 840C Upsampling Compact Disc Player

Max Power Consumption: 40W

Caution Risk of electric shock. Do not open.

Avis Risque de choc electrique. Ne pas ouvrir.

Achtung Vorm öffnen des gërates. Netzstecker ziehen.

www.cambridge-audio.com

	IR Emitter	Control Bus
RS232C	In	In	Out

Designed in London, England

Digital Outputs		Digital Input 1		Digital Input 2
						Class 1 Laser Product
						Luokan 1 Laserplaite
						Klass 1 Laserapparat
S/P DIF	Toslink	S/P DIF	Toslink	S/P DIF	Toslink
Co-axial	Optical	Co-axial	Optical	Co-axial	Optical

Unbalanced Audio Out		Balanced Audio Out		GND
		Left	Right
Left	Left
Right	Right
		Left	Right

Manufactured in an

ISO9002 approved facility

Azur Class XD integrated amplifier 13