Lectrosonics DMPA12 Data Sheet
DMPA12
Digital Power Amplifier
TECHNICAL DATA
• 12-channel class-D power amp with bridge
tied load (BTL)
• 10 Watts per channel; adjacent channels can
be tied together for doubled output power
• Every output channel includes a DSP delay,
nine filters, compressor and limiter
• Passively cooled; no heat buildup
• Inputs are taken from the Lecnet 2 DANI
TM
bus
forward or backward propagated signals - no
analog inputs are provided
• Front panel level controls and LED signal
status indicators
The DMPA12 is a powerful digital audio processor and
multi-channel power amplifier combined into a single
rack space component designed to work with DM Series
processors. The design represents a milestone in DSP
technology in its basic architecture and in its processing speed and efficiency. The primary applications are
sound reinforcement and teleconferencing systems in
boardrooms, courtrooms, lecture halls, distance learning
applications, hotels and other systems with multiple microphones and loudspeakers. The design is ideally suited
to mix-minus sound reinforcement designs.
Inputs are taken from the DANITM bus (Digital Audio Network Interface) which is common to all DM Series components. Each output can drive a variety of loads, including
loudspeakers, long cable runs and headphones. The BTL
configuration allows two adjacent channels to be wired in
parallel on a common load to double the output power.
The amplifier is designed to run continuously (idle or with
a load) without heat buildup, making it ideal for permanent
installations where prolonged operation is required.
Class-D amplification is implemented with a late generation component that provides exceptional efficiency, low
heat, excellent audio performance and is indestructible
with wiring errors.
Each output channel includes a delay, nine filters, a
compressor and limiter. Settings are stored in memory
with 24 different presets available for immediate recall of
all setup parameters. Presets can be recalled with serial
commands or simple contact closures.
Remote control can be implemented with serial commands or via rear panel logic I/O connections using
simple switches and pots. Rear panel controls are essentially the same as other in DM Series models.
A software control panel is supplied for setup and monitoring. The standard tabbed environment in the GUI provides an intuitive interface for quick setup and diagnostics.
A powerful Macro language is included for control and to
make changes to the setup configuration or the levels “on
the fly.” Macros can be launched with serial commands or
contact closures on the rear panel logic I/O connections.
Multiple macros can be tied together in strings where one
macro calls another, which calls another, etc., providing
extensive control functionality. A built-in Macro Recorder
and Macro Editor are included in the software control
panel to simplify the creation of macros.
Front panel indicators provide output level status at a
glance. The multi-color LEDs indicate as follows:
OFF: Channel is inactive
GREEN: Audio signal present at level
greater than -35 dBu
ORANGE: Compressor is active
RED: Limiter is active
BLINKING ORANGE: Fault exists at output
BLINKING RED: Channel muted at front panel
Rio Rancho, NM, USA
www.lectrosonics.com
581 Laser Road NE • Rio Rancho, NM 87124 USA • www.lectrosonics.com
(505) 892-4501 • (800) 821-1121 • fax (505) 892-6243 • sales@lectrosonics.com
Activity Indicator
Output Gain
-70 - +20 dB
1 dB steps
Nine Filter
Stages
Delay Compressor Limiter
Level Meter
Off, LP, HP, BP,
PEQ, LS, HS
6 or 12 dB/oct.
Butterworth or Bessel
when applicable
0 – 200 ms
0.5 ms steps
Threshold
Comp. Ratio
Time Constant
Indicator
Activity Indicator
Gain Reduction Indicator
Threshold
Time Constant
One of 12 Output Signal Processing Blocks
DMPA12 control, signal flow and processing
SHARC is a registered trademark of
Analog Devices, Inc.
USB
Port
RS-232
Port
Prog I/O
Port
Micro
Controller
Prog I/O Conn
DB25
LecNet 2 Conn
1/8 '' Jack
Front & Rear
USB B Conn
Control Signals
8
11
12
A/D
Output Volume Control Pots
12
TxTxRx
Rx
Digital
Audio
Network
Interface
(DANI)
12 + 2 Submix + Mix Control
12 + 2 Submix + Mix Control
12 + 2 Mix + Mix Control
12 + 2 Mix + Mix Control
Sync Audio Frame Sync
Quad RJ-45 Conn
Pink Noise Generetor
1 kHz Tone Generator
Third Generation
SHARC ® DSP
Out 1
Out 2
Out 3
Out 4
12 output tricolor
signal indicator
LEDs
Signal Processing D/A
Signal Processing D/A
Signal Processing D/A
Signal Processing D/A
Signal Processing D/A
Signal Processing D/A
Signal Processing D/A
Signal Processing D/A
Signal Processing D/A
Signal Processing D/A
Signal Processing D/A
Signal Processing D/A
Out 12
Out 11
Out 10
Out 9
Out 8
Out 7
Out 6
Out 5
Off: No signal
Green: Signal present
Orange: Compressor active
Blinking orange: Fault
Red: Limiter active
Blinking red: Channel muted at front panel
External control, the user interface and signal
flow are shown in the diagram at left. Multiple
DM Series units interconnected in a system pass
control information and audio signals via the
DANITM bus (Digital Audio Network Interface) as
shown in the diagram.
Each of the 12 outputs on the DMPA12 includes
the signal processing stages shown below. The
signal flow passes through a logical sequence to
apply needed conditioning and level settings. The
setup tabs across the top of the screen in the
control panel GUI appear in the same sequence
as shown in the diagram.
The setup screens in the supplied GUI are presented
in a familiar tabbed format
Specifications
Amplifier type: Class-D with bridge tied load (BTL).
Number of outputs: 12
Rated power per output channel: 10 Watts (Two outputs can be tied
together for 20 Watts into 4 Ohms)
Load impedance: 4 to 8 Ohms
Total harmonic
distortion (THD): 0.2% (10mW to 10W, 20Hz to
20kHz)
Dynamic range: 95 dB
Frequency response
flatness: +/-1 dB (20 Hz to 20 kHz)
25 April 2007
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