Operation Manual
2. Introduction
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C SERIES Operation Manual rev 3.0.0
2.2. Main Features
Your new C Series amplier incorporates 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.
2.2.1. Class TD amplifier and Regulated Switch Mode Power Supply (R.SMPS)
LAB GRUPPEN’s patented Class TD technology combines the exceptional efciency of a Class D amplier 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 rened and pushed to a higher level to achieve much greater efciency.
The Class TD output sections work in concert with LAB GRUPPEN’s unique, regulated switch-mode power supply
(R.SMPS) to create a superior overall power amplier topology. This ensures stable, full output power over an
extremely wide range of mains voltage levels. Sagging or uctuating mains voltage will not affect the power output
delivered to the loudspeakers.
2.2.2. Amplifier gain
For greater exibility in system integration, C Series ampliers 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 avoiding a poor signal-
to-noise ratio. This gain adjustment feature makes it easier to achieve an optimal balance between headroom and
noise oor.
2.2.3. Voltage Peak Limiter (VPL)
The Voltage Peak Limiter (VPL) feature allows user adjustments that determine maximum voltage output, thus
matching the amplier to the connected speaker load. Whether the connected load is low impedance (2 to
16 ohms) or high impedance (70 V / 100 V), the VPL feature can be set to ensure that neither temperature nor
current limitations are exceeded before reaching the desired voltage threshold.
2.2.4. Protection and performance optimization
Appropriate and reliable power amplication is vital to any audio system. Inadequate or faulty power amplication
could cause damage to the loudspeakers, or in some cases to the power ampliers themselves. To prevent any
damage or costly service interruptions, C Series ampliers offer advanced features to protect both internal circuits
and any connected loads. These features even protect the mains fuse that, in extreme cases, could be overloaded.