A & E Specifications

Architects’ and Engineers’ Specification
PLM+
™
Series: Powered Loudspeaker Management
™
W W W . L A B G R U P P E N . C O M
Connectors, Network, and User Interfaces
Power Supply, Protection, and Cooling
The power supply shall be a universal regulated switch mode
type operating at voltages from 70 V to 265 V at line frequencies
of 45 Hz to 66 Hz. Under-voltage limiting shall enable continued
operation with line sags as low as 65 V. A soft start circuit shall
limit current inrush at power-up to 8 A. A power average limiter
shall incorporate a software-control breaker emulation to prevent
tripping of mains fuses. The amplier shall be cooled by three
temperature-controlled, variable-speed fans, with air ow from front
to back
Physical
The unit shall be 483 mm (19 in.) wide, 88 mm (3.5 in / 2 U)
high, and 498 mm (19.6 in.) deep including handles and rear
support. The weight shall be 16.5 kg (36 lbs). The chassis housing
shall be black painted steel with a black painted steel and aluminum
front surround and handles. The unit shall be approved for use as
specied by CE, ANSI / UL 60065 (ETL), CSA C22.2 NO. 60065,
PSE, RCM, FCC and BIS India. The unit shall be the Lab.gruppen
PLM 20K44.
PLM 20K44
Overview and Functions
The unit shall comprise a four-in/four-out digital loudspeaker drive
processor with power ampli
er outputs. A dditional capabilities and
facilities shall include load verication and real-time
performance monitoring; low-latency, Ethernet-based audio
networking; third-party control system compatibility using
custom middleware; control and monitoring of internal para-
meters from a remote computer; and optional software
integration of industry-standard acoustical measurement tools. All
control, monitoring and measurement facilities shall be remotely
accessible via a custom PC software interface supplied with the
unit. The included integrated software package also shall include a
custom amplier conguration interface and additional features to
expedite system design, specication and commissioning.
Digital Loudspeaker Processing
Power Amplier
Maximum total power output shall be 20,000 W or 5,000 W per
channel nominal @ 2.67 ohms; output at 4 ohms shall be 4400 W
per channel nominal. The amplier topology shall allow exibility in
output power management, with the capability to allocate total
available power across output channels as needed for the
application. Any channel shall be capable of being signicantly
scaled up in order to distribute the output power, up to 5900 W
into optimal impedance. Maximum peak output voltage shall be
194 V and maximum output current shall be 67 A. When adjacent
channels are bridged, power output per channel shall be 8800
watts into 8 ohms, 9600 watts into 4 ohms and 10000 watts into
4.4 to 6.6 ohms.The amplier shall incorporate power factor
correction (PFC) to
reduce requirements on the mains distribution
system. Amplier gain shall be digitally congurable from 22
dB to 44 dB. The unit shall exhibit the following performance
parameters: Frequency response shall be 20 Hz – 20 kHz ± 0.05
dB (1 W into 8 ohms). Dynamic range shall be >114 dB. Propagation
delay shall not exceed 1.61 ms for AES3 input (96 kHz) or 1.68 ms for
analog input. The unit shall incorporate a DSP-implemented zero
overshoot voltage peak limiter adjustable per channel for
voltage threshold and prole.
Load Verication and Circuit Protection
The unit’s DSP and on-board rmware, in conjunction with
supplied PC control software and loudspeaker database, shall
enable the unit to verify that loudspeaker loads are connected as
intended, and to identify defective drivers or faulty wiring. The
DSP and associated software also shall allow real-time monitoring
of critical performance parameters for both the power amplier
section and connected loudspeakers. Circuits and sensors shall be
provided for warning and protection against VHF (Very High
Frequencies), DC at output, over-temperature, open load, excessive
current, and voltage peak clipping.
Item no. AES-PLM20K44_V2 - 21.02.2018
The unit shall include four discrete modules of digital loudspeaker
processing. Audio inputs shall be analog with oating ground
isolation, AES3 digital, AES67 and dual redundant Dante
Ethernet-based network. Auto failover switching among inputs shall
be user programmable. Facilities shall be provided for exible input
mixing and routing. DSP capabilities shall include raised cosine
equalization, FIR, linear-phase and classical crossovers, and peak and
RMS limiters.
The rear panel shall provide inputs for analog signals on four XLR-F
connectors and for AES3 digital signals on two XLR-F connectors.
In addition, two etherCON
®
housed RJ45 Ethernet jacks shall be
provided for AES67 and Dante networked digital audio as well as
monitoring and control via remote PC. The unit shall be compatible
with use as part of a low-latency, self-conguring digital audio
network that supports sampling frequencies of 48 and 96 kHz.
Output connectors on the unit shall be either binding post or Neutrik
®
speakON
®
(2 x NLT4 and 1 x NLT8). The front panel user interface
shall include a high-brightness 2.5-inch LCD panel, a
moisture-resistant silicone touch pad, and a rotary encoder. The user
interface shall be menu-driven, with screen displays and soft-keys
accessing functions of the digital loudspeaker processor and the
power amplier. Dedicated keys shall be provided for Mute Enable,
Meter and Menu functions. Multicolor LEDs shall indicate presence
of any warning or fault conditions. The unit shall be supplied with a
custom software program for comprehensive monitoring of system
status and operating parameters, as well as control of DSP and
amplier functions. The software program shall be compatible with
use on a Tablet PC, and shall offer plug-in integration of proprietary
audio and acoustical measurement tools in the same user interface.