Data Sheet

D Series: Technology Overview
The D Series from Lab.gruppen off ers an unprecedented
combination of sustained high output, impeccable sonic performance,
confi guration fl exibility, and real-world effi ciencies for reduced
installation and operating costs. D Series brings the world’s most
innovative, capable and proven amplifi er technology to virtually any
high specifi cation installation project, regardless of preferred DSP
platform or specifi c matrix components.
Proven Lab.gruppen Technologies
Reliability and durability remain the bedrock criteria for any installation
amplifi e
r, and in this regard the D Series rigorously maintains
Lab.gruppen’s industry-leading reputation. The amplifi er output
stages are the Lab.gruppen patented Class TD
®
which couples the
effi ciency of Class D topologies to the sonic purity of Class B designs.
Equipped with the Intercooler cooling system, D Series amplifi ers
dissipate heat more eff ectively and eliminate “end of tunnel” output
device over-temperature problems. D Series also off ers a full suite
of protection features, including thermal “show-must-go-on” limiting,
short circuit protection, excessive average current limiting, sustained
VHF (very high frequencies) protection, DC protection and voltage-
and current-clip limiting. None of the limiters introduce slow, long term
gain changes that can risk altering the balance of a tuned system.
A Breaker Emulation Limiter (BEL) prevents power interruption while
Under-Voltage Limiting (UVL) allows continued operation despite
severe voltage drops.
SUB
LOW
MID
HIGH
D Series - Amp channels power adjusted to match the loudspeaker requirements
SUBS
LOW FREQUENCY
DRIVERS
MID FREQUENCY
DRIVERS
HIGH FREQUENCY
DRIVERS
Amplifier Power Required
Frequency
Rational Power Management (RPM)
At the core of the D Series platform is Rational Power Management
(RPM), a proprietary Lab.gruppen technology that gives system
designers and integrators unprecedented freedom to allocate the
output power available on each channel for optimum performance
with specifi c load conditions. RPM technology also enables the
integrator to minimize initial equipment costs, reduce rack space
requirement and improve long-term energy effi ciency – all without
compromising sonic performance.
With conventional installation amplifi ers, it is often necessary to
“over-specify” amplifi ers to meet the maximum power demand
on one channel, leaving excess power capacity wasted on the
remaining channels. RPM reduces costly excess capacity by allowing
re-allocation of output power capacity among the four channels.
RPM can be confi gured so that any channel can supply up to 5000 W
regardless of power model. With RPM in the D Series, the maximum
output channel(s) can be used for power-hungry low-frequency
systems while the remaining output power can be allocated as
needed for the mid-frequency and high-frequency drivers, or for less
demanding zones within a typical large project – such as concessions,
concourses, VIP suites and function rooms within a sports arena
or stadium.
From within the CAFÉ software, RPM allows the desired power
demand to be specifi ed for the diff erent loads in several diff erent
ways. RPM then analyses the desired power in relation to diff erent
channel and device constraints. If all desired power levels are within
constraints, RPM safeguards the balance and assures that the
specifi ed output power will be maintained regardless of demand of
on other channels. If a particular zone’s input is being driven beyond
the specifi ed power levels, RPM aids in limiting that zone to make sure
the power is available for other zones. If the desired total power is in
excess of what the power model can deliver, RPM can facilitate that
the limitation is shared equally among the channels.
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