Operation Manual
2. Introduction
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C SERIES Operation Manual rev 2.0.0
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 D output stage and universal power supply with PFC
All C…X ampliers employ a unique Class D output stage that is ideally matched to the lower power outputs of
these ampliers. The original C Series ampliers, with power output up to 8800 watts total, require use of
LAB GRUPPEN’s patented Class TD in order to maintain sonic purity and high efciency; however, at the lower
power levels of the C…X models, LAB GRUPPEN’s advanced Class D circuit offers the same performance benets
in a more cost effective manner.
C…X ampliers also incorporate a newly developed universal switching power supply which accepts any voltage
from 100-240 V (+/- 10%) @ 50 or 60 Hz. A Power Factor Correction circuit stabilizes current draw under
changing conditions.
2.2.2. Amplifier gain
For greater exibility in system integration, C...X ampliers allow gain adjustment from +29 to +38 dB in 3 dB
steps. 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 Vrms / 100 V peak), 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.