DMA8Plus Digital Media Adapter

Dolby Digital Media Adapter DMA8Plus

The Dolby® Digital Media Adapter DMA8Plus provides digital-to-analog conversion of a digital cinema system’s audio to integrate with an existing cinema processor that may not already provide this capability.

Four separate digital inputs will accept up to eight channels of PCM digital audio as well as Dolby Digital and Dolby E bitstreams. Two-channel audio sources can be decoded as discrete L/R, Dolby Pro Logic®, or Dolby Pro Logic II. A separate, adjustable global audio delay is assigned to each digital input to ensure that sound and picture are perfectly synchronized. The front panel is designed for usability, with manual control and digital clock status for each digital input selection, Decode mode status, and eight-channel signal presence. DMA8Plus setup software is used during installation as well as for interactive remote monitoring.

Flexible Inputs and Outputs Four digital inputs accept up to eight channels of PCM digital audio as well as Dolby Digital and Dolby E bitstreams. Two-channel audio sources can be decoded as discrete L/R, Dolby Pro Logic II, or Dolby Pro Logic. Analog audio outputs are calibrated to cinema processor reference levels to ensure a straightforward interface with your cinema’s existing sound processor.

Easy Setup The DMA8Plus is easy to set up via a laptop computer. It can be controlled by your cinema’s automation system via standard GPI/O automation, serial, or Ethernet commands.

External Source Compatibility The DMA8Plus includes a switched “through” connection for external film audio decoders or six-channel analog sources such as the Dolby Digital Adapter DA20. In this way, the DMA8Plus and the DA20 can share the cinema processor’s six-channel input format.

Adjustable Global Audio Delay A separate adjustable global audio delay is assigned to each digital input to ensure that sound and picture are perfectly synchronized during digital cinema presentations. Different delays can be assigned to different inputs, giving flexibility with alternative content sources that require different delays.

Convenient Front-Panel Design The front panel is designed to provide a wealth of feedback and usability for the user. Simple manual control is provided by the four digital input buttons and one film pass-through button. The valid indicators verify digital signal presence on each associated input. Other indicators reveal the bitstream format, the Decode mode, and eight-channel analog output signal presence. A USB port provides a reliable PC connection for the setup software application.

DMA8Plus Digital Media Adapter Front View Medium
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Front Panel

PC Connection

USB port for setup operations and software upgrades

Input Selector Buttons

Digital 1 through 4 source buttons
Film source button


Valid LEDs represent digital input clock presence for each digital input
Format LEDs indicate PCM, Dolby DigitalDolby E, or Aux (future) processing Decode mode
LEDs indicate Dolby Pro Logic II, Pro Logic, or Discrete modes
Output activity LEDs indicate signal presence of each output channel

Rear Panel

Analog Audio Output

25-pin male D-connector, balanced for connecting to a Dolby cinema processor L, C, R, Ls, Rs, Sw, 7, 8

Analog Audio Input

25-pin female D-connector for six-channel analog input from the output of a DA20 or other external processor, which is passed through when Film mode is selected or during power-off

CP, DA Control

25-pin male and female connectors for format sensing and control providing a customized interface for each Dolby cinema processor

RS-232 Serial Port

9-pin female D-connector for interfacing with software-based automation systems by way of ASCII command strings

10Base-T Ethernet Port

Ethernet port for interfacing with Dolby Digital Cinema systems and ASCII command strings

Digital Media Automation

9-pin female D-connector, ground switching relay contact closure for each front-panel button control; relay contacts provided for CP200 SW control (closure upon any digital format selection)

Digital 1 Input (4 × AES)

25-pin female D-connector provides four AES/EBU inputs of PCM audio (up to eight channels)
Input impedance: 110Ω

Digital 2 Input (1 × AES)

Male BNC connector, unbalanced, per AES-3id-1995/SMPTE 276M Input impedance: 75Ω

Digital 3 Input (1 × AES)

Male BNC connector, unbalanced, per AES-3ID-1995/SMPTE 276M Input impedance: 75Ω

Digital 4 Input (Optical)

Optical connector for digital input


1-U rackmount chassis frame

Digital Audio Source Formats

PCM: 44.1, 48, and 96 kHz; 16-, 20-, 24-bit
Dolby Digital (AC-3)
Dolby E (23.98, 24, 25, 29.97, 30 fps)
Dolby Pro Logic II
Dolby Pro Logic

Dolby Cinema Processor Compatibility

CP650, CP500, CP65, CP55, CP45, CP200

Global Audio Delay

Adjustable delay of all channels from 0–250 ms

Surround Channel Delay

Digital media program sources: adjustable from 0–150 ms

Power Requirements

100–240 VAC, 50–60 Hz

Dimensions and Weight

1-U rackmount chassis
44 × 483 × 342 mm (1.75 × 19 × 13.5 inches)
Net: 4.5 kg (10 lb)

Environmental Conditions

Operating: 0°C–40°C (32°F–104°F),
Nonoperating (storage): 0°C–85°C (32°F–185°F)
Humidity: 20%–80% relative, noncondensing

Regulatory Notices

North America: This unit complies with the limits for a Class A digital device, pursuant to Part 15 of the FCC rules, and Industry Canada ICES-003 Class A requirements. It is UL Listed for the US and Canada.
Europe: This unit complies with the requirements of Low Voltage Directive 73/23/EEC and EMC Directive 89/336/EEC and carries the CE marking accordingly. RoHS compliant.


Choose from the drop-down menus below to get Dolby professional reference material.