DMP 128 Plus

12x8 ProDSP Digital Matrix Processors

The DMP 128 Plus Series is the next generation of Digital Matrix Processors featuring Extron’s exclusive ProDSP™ 64-bit floating point technology. Each DMP 128 Plus features 12 analog mono mic/line inputs, eight analog outputs, up to four channels of digital audio input and output via USB, up to eight audio file players, an ACP bus for audio control panels, and configurable macros. The C models also include twelve independent channels of world class AEC - Acoustic Echo Cancellation and noise cancellation. The V models include up to eight channels of VoIP, supporting Session Initiation Protocol - SIP 2.0. The AT models provide Dante® audio networking technology with connectivity for 48 digital audio inputs - Rx, and 24 digital audio outputs - Tx.

The DMP 128 Plus Series offers a configuration approach to DSP that simplifies mixing, routing, conferencing, and room optimization. Quick and intuitive configuration using the DSP Configurator Software allows the DMP 128 Plus to be installed in very little time, with easy-to-learn adjustments that can be heard in real-time.

Extensive Mix Matrix and Flexible Routing

The DMP 128 Plus and DMP 128 Plus C models feature an extensive 52x44 mix matrix allowing all 12 analog inputs, 8 aux inputs, 16 expansion bus inputs and 16 virtual bus returns to be discretely routed to any or all of the 8 analog outputs, 4 aux outputs, 16 expansion bus outputs and the 16 virtual bus sends. The DMP 128 Plus C V model features a 52x48 mix matrix and 4 additional aux outputs to allow for routing of VoIP channels.

The DMP 128 Plus AT and DMP 128 Plus C AT models include up to eight SIP 2.0 VoIP lines, with wideband codec support, that can be configured as individual extensions or with multiple call appearance channels to support local conferencing applications. Compatible with a majority of existing VoIP systems, any single V model of the DMP 128 Plus Series can be used for a single VoIP line or as a VoIP farm for up to eight rooms.

Expanded Routing Across Two DMP 128 Plus Processors

A DMP EXP expansion port, allows two DMP 128 Plus units to be linked together via a single shielded CAT 6 cable. This creates a 16 channel bi-directional 24-bit/48 kHz high-resolution digital audio expansion bus between the two units, allowing expanded input and output signal management and routing capabilities. This same expansion port can be found on Extron’s DTP CrossPoint 4K series, allowing them to be linked to the DMP 128 Plus.

Dante Audio Networking

Dante-equipped DMP 128 Plus AT models provide scalable audio transport, with Dante Domain Manager support, over a local area network using standard Internet protocols. Each DMP 128 Plus AT sends out 24 channels of digital audio and can receive 48 channels over the network. A built-in four-port Gigabit switch also provides direct interconnection of multiple DMP 128 Plus AT processors, AXP 50 C AT, AXP 64 C AT expansion processors and AXI 22 AT D to create larger, cost-effective audio matrixes. Additionally, the DMP 128 Plus AT can be configured to support primary and redundant Dante audio networks, including AES67.

VoIP - Voice over Internet Protocol Capability

DMP 128 Plus C V and DMP 128 Plus C V AT models include up to eight VoIP lines, with wideband codec support, that can be configured as individual extensions or with multiple call appearance channels to support local conferencing applications. Compatible with select VoIP systems, any single V model of the DMP 128 Plus Series can be used for a single VoIP line or as a VoIP farm for up to eight rooms.

FlexInput Capability for Dante Inputs

DMP 128 Plus AT models include FlexInputs to provide the additional capability of processing Dante channels from remote wireless microphones, wallplates, and other sources anywhere on the Dante network, in place of local mic/line inputs 1 through 12. This allows incorporating the full range of DSP processing capabilities, including AEC, for incoming Dante channels.


The DMP 128 Plus features an automixer with gated and gain sharing modes for managing up to eight groups of microphone signals. Gating threshold, signal level reduction, and timing parameters are user-adjustable per channel. This allows for fine-tuning to avoid the “chopped” sound characteristic of a traditional automixer when a mic is gated off.

Acoustic Echo Cancellation

The four DMP 128 Plus C models include Extron AEC for conferencing applications. AEC is essential for effective remote room-to-room conversations, ensuring clear, natural communication for all participants. These models include twelve independent channels of high performance AEC, as well as selectable noise cancellation. Extron AEC features advanced algorithms that deliver fast echo canceler convergence for optimal intelligibility, even in challenging conditions such as double-talk and the use of wireless microphones.


The DMP 128 Plus features Extron ProDSP, a powerful digital signal processing platform based on a 64-bit floating point DSP engine. ProDSP provides an extensive array of digital processing tools for audio system design, configuration, and optimization. The DSP Configurator Software is the user interface to ProDSP for full control and management of the DMP 128 Plus and all of its DSP functions, including gain, filtering, dynamics, delay, ducking, loudness, and feedback suppression. DSP Configurator Software is also used to configure and manage AEC and automixing. An integral part of the DSP Configurator Software is the Graphical User Environment, which allows for quick and easy visualization of all signal paths inside a single window. Working within this user-friendly environment, an audio system designer or installer can clearly view and adjust all input levels, audio DSP processing parameters, mixing points, and output levels. To simplify these adjustments, SpeedNav keyboard navigation ensures efficient and fast navigation through the Graphical User Environment, using just the keyboard on a laptop.

Extensive Array of DSP Tools

Gain Stages Input
Output Trim
(+80/-18 dB, Mute, 48V, Polarity)
(+12/-100 dB, Mute)
(+12/-100 dB, Mute)
(+12/-12 dB)
(+0/-100 dB, Mute)
Filters Parametric EQ
Notch EQ
High Pass Butterworth
Low Pass Butterworth
High Pass Bessel
Low Pass Bessel
High Pass Linkwitz-Riley
Low Pass Linkwitz-Riley
Treble Shelving
Bass Shelving
(±24 dB, Q: 0.5-30)
(+0/-30 dB, Q: 1-60)
(6-48 dB/Oct)
(6-48 dB/Oct)
(6-48 dB/Oct)
(6-48 dB/Oct)
(12-48 dB/Oct)
(12-48 dB/Oct)
(±24 dB, 6-48 dB/Oct)
(±24 dB, 6-48 dB/Oct)
Dynamics AGC - automatic gain control
Noise gate
Delay Up to 200 ms
Resolution of 0.021 ms (1 sample)
Ducking Signal at input initiates multiple priority level ducking of any or all other inputs and virtual returns
Adaptive Gain Signal at input initiates gain on any one or all other inputs and virtual returns
AEC 12 independent acoustic echo cancellers with selectable noise reduction
Automixing 8 gating or gain sharing automixer groups
Available on all analog and digital inputs
Feedback Suppression 15 dynamic and 5 fixed notch filters
Notch EQ (+0/-30 dB, Q: 5-60)
Extron ProDSP includes all the essential DSP tools needed to set up and fine-tune audio systems. These tools, or processing blocks, allow for control and management of gain dynamics, filtering, delay, ducking, and feedback suppression. Input and output levels can be monitored at any time by simply opening any of the input or output Gain or Volume windows.

Highest Quality Converters Plus Floating Point DSP

The DMP 128 Plus features studio grade ADCs - analog-to-digital converters and DACs - digital-to-analog converters using professional level 24-bit resolution and 48 kHz sampling, fully preserving the integrity of the original audio signal. The processing power of the 64-bit floating point DSP engine allows for simultaneous audio processing algorithms within the same channel, and across multiple channels, without compromising sound quality. Throughput latency – the normal delay of audio signals due to audio processing – is deterministic, with very low overall latency regardless of the number of channels and processes, so that audio is kept in sync with video. This powerful DSP engine also delivers very wide dynamic range to prevent clipping and fully maintain signal quality.

Fixed Yet Flexible DSP Architecture

The DSP Configurator Software features a fixed layout of DSP processing blocks for each input, output, and virtual bus. Each block in the Graphical User Environment represents a Gain, Dynamics, Delay, Filter, Ducking, or FBS - Feedback Suppression algorithm within the DSP engine. While this architecture is fixed, each block offers flexible options and customizable parameters. For example, the Filter block contains several selectable filters, each of which can be customized as high pass, low pass, bass and treble or parametric EQ. Each processing block can be selectively bypassed.

Emulate and Live Modes

The DSP Configurator Software features an Emulate mode, which provides complete audio system design while working offline on a PC. When connected to the DMP 128 Plus, Live mode enables real-time control of all settings, file updates, and archiving, plus active metering of all input and output channels. In Live mode, integrators can “push” all or part of a configuration to the DMP 128 Plus from the PC, while preserving the existing file. Emulate and Live modes give audio system designers the flexibility to create an entire project from their PC in advance of installation, and then, once they are on-site, use the same software to provide accurate system setup and final optimization.

Key Features

  • Six models with 12 analog mic/line inputs and eight analog line outputs
  • All models include a USB Audio interface, providing up to four channels of digital audio sends and returns
  • New C Models include AEC and selectable noise cancellation on input channels 1–12
  • New Dante audio networking with Dante Domain Manager and AES67 support provides a wide range of expansion capabilities, AT models only
  • V models include up to eight VoIP lines that can be configured as individual extensions or with multiple call appearance channels to support local conferencing applications
  • Optional ACP Series audio control panels provide intuitive audio system control
  • Macros allow the sequencing of commands that can be sent to the local device or external devices via the LAN port
  • Aux I/O ports can be individually configured as USB Audio, audio file player, or in V models, VoIP
  • Advanced audio processing on all eight analog outputs and all 16 direct Dante/Expansion outputs
  • Extensive mix matrixing in every DMP 128 Plus allows all inputs to be discretely routed to any or all outputs
  • 16 virtual processing loops allow for great flexibility in sub-mixing and processing
  • Up to eight audio file players can be used to play back audio files for system set-up or as part of the system design
  • Lower latency keeps audio in sync with video, and prevents distractions to presenters or performers resulting from delayed live audio
  • New adaptive gain processor block that allows a given microphone input to affect levels on any one or all other inputs and virtual returns
DMP 128 Plus C V

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