C Series Operation Manual
7
avoiding a poor signal-to-noise ratio. This gain adjust-
ment feature makes it easier to achieve an optimal
balance between headroom and noise floor.
4..3 Voltage Peak Limiting
The Voltage Peak Limiting (VPL) feature allows user
adjustments that determine maximum voltage output,
thus matching the amplifier to the connected speaker
load. Whether the connected load is low impedance
(8, 4 or 2 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.
4..4 Protection and performance
optimization
Appropriate and reliable power amplification is vital
to any audio system. Inadequate or faulty power
amplification could cause damage to the loudspeakers,
or in some cases to the power amplifiers themselves.
To prevent any damage or costly service interrup-
tions, C Series amplifiers 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.
Following are short descriptions of standard built-in
C Series protection features:
CPL
, Current Peak Limiter ensures that the
amplifier’s output does not exceed the safe
current handling parameters of amplifier
components.
Temperature protection
ensures that the
amplifier will not be damaged by exceeding
thermal limits.
PAL
, Power Average Limiter limits the maximum
average power consumption according to the
power supply and mains-breaker capabilities.
Vhf
, Very High Frequency protection circuits
mute the output of the amplifier when non-
dynamic continuous signals above 10 kHz are
detected.
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.
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
at the same time output signal is high, simultane-
ously, and no current draw is measured. This
situation might occur when no speakers are
connected, or when a driver is blown.
Low inrush current
ensures that the mains
breaker will not trip when several power
amplifiers are turned on simultaneously.
4..5 NomadLink / Ethernet control and
monitoring network
The NomadLink network allows easy setup and
control of C Series power amplifiers and other
devices. The patented network topology allows
automatic detection and addressing of multiple
amplifiers, and is controlled from a PC via a bridge
(NLB 60E) using standard TCP/IP communication.
Phantom powering through the network cables
allows the software to detect devices that are not
currently turned on or connected to the mains. This
ensures very high reliability and redundancy levels
while allowing connected amplifiers to remain on
standby with no power consumption.
Cable connections can be daisy-chained for
easier system setup. This also reduces total
component costs, simplifies installation, and makes
daily operation more convenient. There is no need to
create a star topology using many switches as with,
for example, an Ethernet system. Individual amplifier
addresses do not need to be manually entered. You
will automatically know where an individual amplifier
resides in the network.
A daisy chain network-loop, in combination with
the automatic addressing of devices, enables
Lab.gruppen’s proprietary DeviceControl editor
software to automatically create a precise picture of all
connected devices and their relative position in the
chain. This is the key to creating a quick overview
of the system layout, allowing simple operation of a
large group of amplifiers. Installation time is kept to
a minimum, and fast access is provided to monitor
performance and solve problems during operation.
Via NomadLink, you can monitor all metering data
as well as all faults and warning indications simulta-
neously. NomadLink also allows you to remotely
control power on and power off, as well as engage
Mute and Solo functions on individual channels.
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WELCOME 4
Summary of Contents for C 68:4
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