Cambridge Audio 840A user manual Volume display, Input gain trim, Fixed level inputs

Page 16

AMPLIFIER SETUP (CONTINUED)

Volume display

Mode

Volume

To change the volume display from decibels (-84 to 0dB) to arbitrary volume units (0 to 72 units) select VOL DB in the System Configure menu. Press the input select button to turn off the volume in decibels. Press the Mode button to exit.

Input gain trim

The relative levels of the inputs can be adjusted by gain trim. This allows each to be adjusted so that each sounds the same in terms of average loudness when you switch between them. Pick the loudest sounding source and trim its level until it matches the average perceived level of the others. Repeat this process if other sources also stand out as louder than the average.

Fixed level inputs

Any input of the 840A is able to be set for fixed gain. Whenever this input is selected the gain will automatically go to this value and will not be adjustable by the volume control. This feature allows the 840A to be effectively used as a stereo power amplifier (for that selected input only). For example, as well as operating as a pure stereo amplifier, the 840A can provide the amplification for the front left and right channels of a surround sound setup with an AV receiver providing amplification for the other channels and controlling the overall system volume.

When listening in stereo use the 840A and connected stereo sources as normal for best possible sound quality. For surround sound, select the fixed level input you have chosen on the 840A and now use the AV receiver to control the volume, select connected surround sound sources etc. You may wish to re-name the fixed level input as “A/V mode” or similar on the 840A. Make connections as below, the left and right preamp outputs of the AV receiver connect to the fixed gain input chosen on the 840A. As the gain can be fixed to any value it is easy to match the level of the 840A to that of the other AV channels.

Mode

Volume

To set the input gain trim for each source, select INP TRIM in the System Configure menu. Select the input required and use the volume control to

L

SW

C

840A

L

AV receiver

R

Stereo

sources

R

Surround

set the gain between 0 and -12 dB (the available range is restricted if the volume is set very low). Press the Mode button to exit.

SL

SB

SR

sound

sources

16Azur Class XD integrated amplifier

Page 15 Page 17
Image 16
Page 15 Page 17
Contents Azur 840A Contents 840A Class XD integrated amplifier IntroductionChecking the Power Supply Rating Safety PrecautionsPlug Fitting Instructions UK Only Important Safety Instructions Rear Panel Connections RS232C BUS Ready/Incognito Ready multi-room outputs Input 1 Balanced AudioPreamp Out Tape In/OutStandby/On Front Panel ControlsPhones Volume ModeBass and Treble Infrared sensorRemote Control Numerical buttonsMute SpeakerA/B Speaker A/BBasic connection ConnectionsTape connection Speaker B connections Preamp Out connectionsBalanced audio connections Speaker A/B Operating InstructionsBalance Amplifier Setup Input gain trim Volume displayFixed level inputs On/Off control menu 640TMULTI-ROOM PS10Custom Installation C.I. USE Remote control commands positiveOver temperature detection CAP5 Five WAY Protection SystemDC detection Overvoltage/overcurrent detectionShort circuit detection Intelligent clipping detectionTroubleshooting Technical Specifications 840ALimited Warranty 840A Class XD integrated amplifier Azur 840A
Top Page Image Contents