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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.
Inside the box of your Alva Duo you will receive:
Initial Setup
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
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.
Maximum Power Consumption 10W
Standby Consumption <0.5W
Mains Inlet Voltage 100-240V AC
Gain @ 1kHz 39dB (Moving magnet) 60dB (Moving coil)
Nominal Output 300mV
Sensitivity for Nominal Output
3.35mV (Moving magnet) 305uV (Moving coil)
Equivalent Input Noise (A-Weighted)
~0.09uV (Moving magnet) ~0.08uV (Moving coil)
RIAA Curve Accuracy +/- 0.3dB 30Hz - 20kHz
Signal to Noise Ratio Grounded Inputs ref. 1V Output (20Hz - 20kHz BW)
>90dB (Moving magnet) >70dB (Moving coil)
THD+N 1kHz (20Hz - 20kHz BW)
<0.0025% (Moving magnet) <0.020% (Moving coil)
Input Impedance
47k Ohm (Moving magnet)
100 Ohm (Moving coil)
Input Capacitance
100pF
Overload Margin >30dB
Crosstalk @ 20kHz
>85dB (Moving magnet) >75dB (Moving coil)
Subsonic Filter Characteristics
-3dB @ 15Hz 12dB/octave
Dimensions (H x W x D)
48 x 215 x 159 mm (1.9 x 8.5 x 6.2 ")
Weight
0.95kg (2.1lbs)
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Here you can download full pdf version of manual, it may contain additional safety instructions, warranty information, FCC rules, etc.
Download Cambridge Audio Alva Duo - Phono Preamp for Moving Magnet & Moving Coil Turntables Manual
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