Welcome – Lab.gruppen C Series 5:4X User Manual
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C Series C 20:8X, C 10:8X, C 10:4X and C 5:4X Operation Manual rev. 1.1.4
Welcome
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CPL (Current Peak Limiter) ensures that the amplifier’s output does not exceed the safe current handling
parameters of the amplifier components.
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Temperature protection ensures that the amplifier will not be damaged by exceeding thermal limits.
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PAL (Power Average Limiter) limits the maximum average power consumption according to the power
supply and mains-breaker capabilities.
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VHF (Very High Frequency) protection circuits mute the output of the amplifier when non-dynamic continu-
ous signals above 10 kHz are detected.
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DC protection ensures destructive DC signals will not appear at the amplifier outputs. If such conditions
occur an internal fuse opens and fault indication is displayed.
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Low-impedance (short circuit) protection provides a fault warning indication and shuts down the output
stage when, for example, an input signal is present and a malfunctioning cable or driver is short circuiting
the output.
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High-impedance warning reports an alert when output signal is high, and simultaneously, no current
draw is measured. This situation might occur when no speakers are connected, or when a driver is blown.
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Low inrush current ensures that the mains breaker will not trip when several power amplifiers are turned
on simultaneously.
2.2.5 GPIO facilities and 35 Hz HPF
Lab.gruppen C…X amplifiers offer two features that provide greater flexibility and reliability in fixed installations:
GPIO (General Purpose Input / Output) facilities and a 35 Hz high-pass filter.
The GPIO connections allow seamless interfacing with many third-party control and power sequencing
systems. In combination with the rear panel DIP-switch, the GPIO connections allow change-of-state power
toggling from two inputs (each closure toggles on-to-off or off-to- on), or same-state ON/OFF from a single
input (closed = on and open = off). A second DIP-switch disables the power ON/OFF commands from the
NomadLink network, allowing only GPI contact closures to trigger power ON/OFF commands.
The 35 Hz high-pass filter rolls off low frequencies (6 dB/octave) for greater efficiency and reliability in, for
example, 70/100 V high impedance systems where the removal of very low frequency content may be desired.