6
C Series Operation Manual
4 WELCOME
4.1 Introduction
Thank you for choosing Lab.gruppen C Series power
amplifiers for your sound reinforcement system
installation. We are confident that you will be
very pleased with the performance, configuration
flexibility, reliability, and long-term durability offered
by the C Series products.
This manual provides a comprehensive guide to the
features and functionality of C Series amplifiers.
Please read through it in its entirely to become fully
acquainted with the many configuration options and
multiple layers of protection circuitry.
To facilitate timely installation and use of this C Series
product, we have included a Quick Guide Overview
(section 6). This brief summary, in conjunction with
Installation (section 5), contains the basic information
needed to safely install the amplifier and place it in
service. However, we highly recommend reading
through this manual in its entirety, beginning with
Main Features and Technologies and continuing
through Operation and Performance. As you become
thoroughly familiar with all aspects of operation, you
may learn of features or options that will affect your
choices on amplifier modes or loudspeaker system
configuration.
Thank you again for placing your confidence in
Lab.gruppen power amplifiers.
Lab.gruppen C Series power amplifiers are designed
and built specifically for the unique demands of
permanent installation applications. C Series
amplifiers offer the optimum combination of high-
quality audio reproduction, flexible features, ease of
installation, and 100% reliability in normal use.
By packing four channels of reconfigurable power
amplification into a 2U chassis, the C Series achieves
unprecedented “power density.” The benefits of
compact dimensions include reduced rack space
requirements and minimal heat build-up. The flexible
output stages enable each amplifier channel to be set
for either low impedance or constant voltage (70 V /
100 V) mode. NomadLink, an easy-to-use network for
monitoring and control, is implemented as a standard
feature on all C Series amplifiers.
Although C Series features and facilities are tailored
to installation applications, at the heart of each
amplifier is the same advanced technology that has made
Lab.gruppen the benchmark of quality for touring
concert systems: exceptional sonic performance,
rugged construction, proven reliability, and protection
features that anticipate every unwelcome possi-
bility.
Read on to learn.
4. Main features
Superficially, your new C Series amplifier may
appear similar to other products made for the same
purpose. On closer inspection, however, you will find
a number of sophisticated technologies – many of
them proprietary to Lab.gruppen – that are provided
to ensure the best possible performance and many
years of reliable operation. Familiarizing yourself with
these technologies will prove invaluable in setting up
and optimizing your loudspeaker system.
4..1 Class Td amplifier and regulated switch-
mode power supply
Lab.gruppen’s patented Class TD technology
combines the exceptional efficiency of a Class D
amplifier with the high sonic quality associated with
Class B designs. Class TD also incorporates the same
basic concepts behind Class H designs, but here they
are refined and pushed to a higher level to achieve
much greater efficiency.
The Class TD output sections work in concert with
Lab.gruppen’s unique, regulated switch-mode power
supply to create a superior overall power amplifier
topology. The regulated PSU ensures stable, full
output power over an extremely wide range of mains
voltage levels. Sagging or fluctuating mains voltage
will not affect the power output delivered to the
loudspeakers.
4.. Amplifier gain
For greater flexibility in system integration, C Series
amplifiers allow gain adjustment from +23 dB to +44
dB in 3 dB steps. This feature accommodates any
combination of input device and loudspeaker type.
For example, if the input signal is weak, the gain can
be boosted to maintain maximum power output while
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