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D Series: Technology Overview
The D Series from Lab.gruppen o- 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 worlds 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 TechnologiesReliability and durability remain the bedrock criteria for any installation
amplifi er, and in this regard the D Series rigorously maintains
Lab.gruppens 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 e- ectively and eliminate end of tunnel output
device over-temperature problems. D Series also o- 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 di- erent loads in several di- erent
ways. RPM then analyses the desired power in relation to di- 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 zones input is being driven beyond
the specifi e d p o w e r l e v e l s , R P M a i d s i n l i m i t i n g t h a t zo n e to m a ke s u r e
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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Speaker outputs
Detachable terminal block connectors for easy
install (up to 16 mm 2 or 6 AWG cables)
Two AES3 digital inputs (4 audio channels) 32 amp locking powerCON for mains supply
Analog inputs with Iso-Float
Four Lake class analog inputs with Iso-Float
ground isolation
EtherCON inputs
Two etherCON jacks are provided for the dual
redundant control and Dante connections
CAFÉ and RPM for Green CredentialsD Series is confi gured and monitored using Lab.gruppens CAFÉ
(Confi guring Amplifi ers For the Environment) software suite. In
addition to providing comprehensive system surveillance and
confi guration of RPM and other amplifi er features such as ISVPL and
Breaker Emulation Limiter (BEL), CAFÉ also includes valuable help
to save the environment. In combination with the RPM confi guration
CAFÉ can accurately predict, based on the true SPL and speaker
requirements of the individual loads for the given project, estimations
of average mains current draw and generated heat in BTU. With
D Series innovative power supply technologies (true Power Factor Correction utilizing Current Draw Modelling) the required mains
draw is already best in class in relation to burst power output, but in
combination with the BEL the mains draw can also be safeguarded
to the predicted level. The end result is precise mains management
and thermal control, which allows more accurate (rather than over-
specifi ed) provision of mains distribution, cabling and cooling.
This technology suite not only saves on installation costs, it also
reduces lifetime running costs and minimizes environmental impact.
It also reduces demands on UPS systems in mission critical voice
evacuation systems in arenas and stadia.
CAFÉ and Equipment Specifi cation Predictor (ESP)CAFÉ also features an innovative design aid - the Equipment
Specifi cation Predictor (ESP). ESP examines the system SPL and
speaker requirements for a given project and aids in transforming
that data into circuit and amplifi er channel requirements. On a system level, ESP supplies a recommendation for optimized placement of
channels into amplifi ers for the most cost e- ective solution. The
recommendation includes model and quantities of D Series required
with most rational use of amplifi ers, minimizing wasted headroom.
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