Cambridge Audio Alva Duo Manuel utilisateur
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Alva Duo
Manual Generated: 01/07/2022 - 22:41
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Table of Contents
Alva Duo 3 .............................................................................................................................................................................................................................
Introduction 4 .......................................................................................................................................................................................................................
What's included with the Alva Duo? 5 ..............................................................................................................................................................................
Front panel controls 6 .........................................................................................................................................................................................................
Rear panel 7 ..........................................................................................................................................................................................................................
Getting connected 8 ............................................................................................................................................................................................................
Auto power down (APD) 9 ...................................................................................................................................................................................................
What is the difference between a moving magnet cartridge and a moving coil cartridge? 10 ..............................................................................
Troubleshooting 11 ..............................................................................................................................................................................................................
Technical specifications 12 .................................................................................................................................................................................................
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Alva Duo
Last updated: June 28, 2022 03:30. Revision #4982
User's Manual
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Introduction
Last updated: June 28, 2022 03:30. Revision #4973
This guide is designed to make installing and using this product as easy as possible. Information in this document has been carefully checked for
accuracy at the time of printing; however, Cambridge Audio’s policy is one of continuous improvement, therefore design and specifications are subject to
change without prior notice.
This document contains proprietary information protected by copyright. All rights are reserved. No part of this manual may be reproduced by any
mechanical, electronic or other means, in any form, without prior written permission of the manufacturer. All trademarks and registered trademarks are
the property of their respective owners.
© Copyright Cambridge Audio Ltd .
For upcoming news on future products, software updates and exclusive offers, make sure you register your product at
http://www.cambridgeaudio.com/register
5
What's included with the Alva Duo?
Last updated: June 30, 2022 11:32. Revision #4996
Inside the box of your Alva Duo you will receive:
1. Alva Duo Moving Magnet Phono Preamplifier.
2. Safety Guide.
3. Quick Start Guide.
4. UK power cord (5A fused) (Depending on which country the Alva Duo was purchased in),
EU power cord (Depending on which country the Alva Duo was purchased in),
CU power cord (Depending on which country the Alva Duo was purchased in)
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Front panel controls
Last updated: June 28, 2022 03:30. Revision #4975
1. Standby/On - Switches the unit between Standby mode (indicated by dim LED) and On (indicated by bright LED). Standby mode is a low power mode
where the power consumption is less than 0.5 Watts.
2. Cartridge Type Selector Switch - Match this switch to the cartridge type installed on your turntable. MM for a moving magnet cartridge and MC for
a moving coil cartridge.
3. Headphone Volume Control.
4. Headphone Output - Allows for the connection of stereo headphones with a ¼” Jack plug. Headphones with an impedance of between 32 and 600
ohms are recommended.
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Rear panel
Last updated: June 28, 2022 03:30. Revision #4976
1. AC Power Socket.
2. Signal Output Sockets - RCA connections used to connect to a line-level input.
Note: Do not connect to a phono-level input.
3. Balance Control - Used to make fine adjustments to the relative output levels of the left and right channels. In the central position the output from
each channel is equal.
4. MM Input Sockets - RCA connections used to connect to a turntable fitted with a moving-magnet cartridge.
5. Ground Connection Screw - If your turntable has a separate grounding lead then connect here. This provides shielding to the tonearm and the
sensitive circuitry in the turntable.
6. MC Input Sockets - RCA connections used to connect to a turntable fitted with a moving-coil cartridge.
Note: Recommended cartridge specifications 0.3-1mV output voltage, 100ohm/100pF loading.
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Getting connected
Last updated: June 28, 2022 03:30. Revision #4977
Initial Setup.
Firstly, using high quality RCA interconnects, connect the outputs of your turntable to the MM input socket of the Alva Duo if fitted with a1.
moving magnet cartridge, or the MC input socket if fitted with a moving coil cartridge.
If your turntable uses a separate ground lead, connect this to the ground screw on the Alva Duo. This reduces any potential hum or buzzing.2.
Connect the signal output sockets of the Alva Duo to a line-level input on your amplifier.3.
Ensure that the balance control is set to the central position. This can be adjusted later if necessary.4.
Attach the mains power lead securely to the Alva Duo and power on the unit.5.
Using the cartridge type selection switch, set the Alva Duo to MM for use with a moving magnet cartridge, or MC for use with a moving coil.6.
This will be indicated by the relevant LED.
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Auto power down (APD)
Last updated: June 28, 2022 03:30. Revision #4978
The Alva Duo comes set up with Auto Power Down (APD) enabled and will automatically switch to standby mode after 20 minutes of inactivity.
To disable Auto Power Down (APD): If you wish to disable the APD function, then press and hold the power button for 5 seconds when in standby.
This can then be reset to factory defaults by plugging in the mains lead with the standby button held down
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What is the difference between a moving magnet cartridge and a moving coil cartridge?
Last updated: June 28, 2022 03:30. Revision #4979
The cartridge mounted to the tonearm of your turntable uses a small stylus tip, made of diamond, to convert the information held within the groove of a
record to a signal which can then be amplified for listening.
During playback the stylus tip, attached to a cantilever, is dragged through a records groove at a consistent speed, tracing the landscape of the record
itself. The physical variations within the groove causes this assembly to vibrate, and it is this physical movement which can then be converted into an
electrical signal through electromagnetic induction.
Electromagnetic induction is a phenomenon that occurs when an inductor is placed within a varying magnetic field. As this magnetic field changes, a
current will be induced within the inductor proportional to the rate of change of the field. This principle is integral to the function of a cartridge and is
achieved using magnets and coils of wire.
Moving Magnet Cartridges.
A moving magnet cartridge uses magnets fixed to the end of the cantilever. These magnets sit within a static set of wire coils, moving within these coils
as the stylus travels along the record groove.
This movement causes a variation in the magnetic field, inducing a small current within the coils that corresponds to the movement of the stylus. This
current can then be amplified for listening using a phono preamplifier.
Moving Coil Cartridges.
The principle remains the same for a moving coil cartridge, with the primary difference being that in this assembly the coils are mounted upon the
cantilever, whilst the magnets remain fixed.
In this formation it is the coils that move in relation to the magnets, causing a variation in the magnetic field, and in turn inducing a small current. These
coils of wire are often much smaller than those used in a moving magnet cartridge, and due to this the signal generated tends to be of a much lower
level. Therefore, moving coil cartridges require a preamplifier with a dedicated MC input to provide the additional gain necessary for optimum
performance.
As the coils are mounted directly to the cantilever of a moving coil cartridge, the cantilever assembly itself is much lighter in comparison to that of a
moving magnet cartridge. This lightweight design contributes to an improved transient response, better clarity during quieter sections of audio, and
more detailed reproduction overall. However, cartridges of this type are therefore much more delicate and tend not to have any user-replaceable parts
as can be seen in many moving magnet cartridges.
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