SPL Volume 2, 2612 User manual
Sound Performance Lab
Mute
Manual
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Dual Channel Volume Control
Model 2602
Volume 2
Model 2612
Analog Dual-Channel Volume Controller
Manual Volume 2, Model 2612
Version 1.2 – 3/2012
Designer: Wolfgang Neumann
This user's guide contains a description of the product. It in no way represents a guarantee of particular characteristics or results of use. The information in this document has been carefully compiled and verified and, unless
otherwise stated or agreed upon, correctly describes the product at the time
of packaging with this document.
Sound Performance Lab (SPL) continuously strives to improve its products
and reserves the right to modify the product described in this manual at any
time without prior notice. This document is the property of SPL and may not
be copied or reproduced in any manner, in part or fully, without prior authorization by SPL.
SPL electronics GmbH
Sohlweg 80, 41372 Niederkruechten, Germany
Phone +49 (0)2163 983 40
Fax +49 (0)2163 983 420
E-Mail: info@spl.info
Internet: spl.info
The construction of the Volume 2, Model 2612, is in compliance
with the standards and regulations of the European Cummunity.
Notes on Environmental Protection
At the end of its operating life, this product must not be disposed
of with regular household waste but must be returned to a collection point for the recycling of electrical and electronic equipment. The wheelie bin symbol on the product, user‘s manual and
packaging indicates that. The materials can be re-used in accordance with their markings. Through re-use, recycling of raw materials, or other forms of recycling of old products, you are making an important
contribution to the protection of our environment. Your local administrative
office can advise you of the responsible waste disposal point.
WEEE Registration: 973 349 88
© 2012 SPL electronics GmbH. All rights reserved. Names of other companies and their products are tra demarks of
their respective owners.
2
Volume 2
Introduction ............................................................................................... 4
Installation and Security Advices .............................................................. 5
Power Supply .............................................................................................. 5
Rear Panel .................................................................................................. 6
Power Supply, ON/Off Switching ................................................................ 6
Rear Panel Graphic, Signal Connections, XLR Pin Wiring ............................. 6
Unbalanced Connections (i. e. RCA, TS Jack) .............................................. 7
Operation ................................................................................................... 7
Volume Control ........................................................................................... 7
Calibrating the Monitoring System ............................................................. 7
Mute ........................................................................................................... 8
Specifications ............................................................................................ 8
Measurements ........................................................................................... 9
Notes ........................................................................................................ 11
Contents
Volume 2
3
Introduction
The Volume Controller Volume 2 serves as a system-independent analog
volume regulator in all areas of audio processing and playback, including
• Stereo music production
• Movie and video post production, video computer games production
• Demanding hi-fidelity applications
Complementing the fully equipped SPL Stereo Monitoring Controller (MTC
2381), the Volume 2 focuses exclusively on the highest possible quality in
active volume control. Users who do not need additional monitoring functionality provided by the MTC 2381 will find the Volume 2 an cost-effective solution
without compromises. The Volume 2‘s design is based on active switching to
avoid nonlinear frequency response introduced by impedance changes with
passive designs when changing levels.
Who needs analog level control?
Simply put—most DAW (Digital Audio Workstation) users. A majority of D/A
converters and sound cards provide nothing in the way of analog level monitoring control, and this means the necessity of varying signal levels at the
converter outputs. The result is a lowered bit rate in the monitoring signal,
which can lead to commensurate loss of audio quality.
A further, very interesting application area is in the construction of a straight,
audiophile-quality stereo playback chain, where the Volume 2 is situated
between the playback machine and either power amp and speakers or simply
active speaker system. In such case s, the play back machine mu st of fer analog
outputs. This provides for minimal financial and electronic efforts through the
most direct possible playback path.
Additional Reasons for employing the Volume 2
• High quality balancing stages with extremely good common mode rejection
(minimize interferences and disturbances in the signal paths)
• The mute switch allows for very fast reaction times in cases where loud
speakers or ears should be protected (for example, with computer crashes)
• Users of analog summing without monitoring facilities can cost effectively
improve their systems
Special Features
The Volume 2 is built only with analog circuitry and performance, and its high
quality parts in sophisticated circuitry design are prerequisites to superior
audio quality:
• High end volume potentiometer and illuminated mute switch from ALPS; the
potentiometer controls signals directly (without VCA or DAC circuitry)
• Balanced XLR in- and outputs
• A high quality power supply with toroidal transformer
• Massive, 45 mm diameter aluminum knobs ensure consistent, refined
handling
• The elegant, compact format housing (215 x 80 mm or 8.5 x 3.1 inch) allows
for flexible desktop positioning near or under a computer monitor or generally saving space in positioning
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Volume 2
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