About Setting Gain Structure

There are two approaches the system designer can take in setting up gain structure, depending upon where output volume is to be controlled. The output volume of the DMP 64 can be controlled by either of the following two gain blocks (see figure 58 on the previous page):

•Volume (E) and

•Pre-mixer gain (B).

NOTE: While the pre-mixer gain control is not in the output signal chain, it can be used to control program level independent of mix-point levels.

In the following instructions, setup is described for output volume or pre-mixer gain when appropriate.

Setting Input Gain

Floating point DSP technology is internally more flexible than fixed point. However, the input ADCs and output DACs always run as fixed point, so it is important to optimize the audio by setting the input level as close to 0 dBFS as possible. This maintains the resolution at 24-bit. Within the DSP it is not critical to maintain audio levels at 0 dBFS in order to secure the resolution at 24-bit.

Input gain can be set using the intended input source device and typical source material for the installation. When source material is not available, it can be set using pink noise obtained either from a pre-recorded track on a DVD or CD, or a signal generator.

For program material, set the input gain level (see figure 58, A) so the meters reach –15 to –12 dBFS, with peaks at approximately – 5 to – 3 dBFS. This setting provides enough headroom to accommodate transients or unanticipated loud events in the program material to avoid clipping.

When using pink noise, it should be recorded at – 20 dBFS. If the player has an output level setting control, set the output of the player to its maximum, or 0 dB of attenuation.

NOTE: If the maximum output setting provides gain, back the control down slightly from the maximum setting.

When using a signal generator, set the output at –10 dBu.

Whichever pink noise source is used, set the input gain in the DSP Configurator so the input meter reads – 20 dBFS.

Setting a Nominal Output Level

In order to set up a gain structure to include signal processing, listening to the audio can be advantageous. Route the audio that carries program material from the source to the speakers in the room being set up. With the output volume control (see figure 58, E) set to – 20 dB, set the external amplifier so the source material plays at a volume level that is reasonably loud, but tolerable.

NOTE: When using the volume control for this purpose, set post-mixer trim (D) to 0 dB. If using the post-mixer trim for this purpose, set volume to 0 dB (100%).

Verify the amplifier is not clipping by observing the amplifier clip indicator. This sets the amplification (volume) nominal level of the system, and if desired, allows listening while making adjustments. Adjust or mute the volume control as necessary (see Setting Volume Control for the Amplifier Stage on page 91).

DMP 64 • Software Control

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Extron electronic DMP 64 manual About Setting Gain Structure, Setting Input Gain, Setting a Nominal Output Level
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DMP 64 specifications

The Extron DMP 64 is a versatile digital matrix processor that is specifically designed for handling multi-channel audio signal distribution in a variety of applications. As a part of the Extron family of audio products, the DMP 64 is particularly well-suited for educational institutions, corporate environments, and other professional settings where high-quality audio management is paramount.

One of the standout features of the DMP 64 is its six inputs and four outputs configuration, allowing users to mix and route audio signals with ease. This flexibility is crucial in environments like lecture halls or corporate meeting rooms where multiple audio sources may need to be controlled simultaneously. The DMP 64 supports a wide range of audio formats and operates seamlessly with both balanced and unbalanced audio signals. This ensures compatibility with various microphones, speakers, and other audio devices.

The technology behind the DMP 64 includes Extron's innovative ProDSP, which enhances audio processing capabilities. ProDSP allows for high-quality sound processing through advanced algorithms that provide features such as equalization, compression, and limiting. The processor also includes preset recall functionality, enabling users to quickly switch between different audio setups as needed. This can be particularly beneficial in dynamic environments where quick adjustments are often required.

Another important characteristic of the DMP 64 is its user-friendly interface. With intuitive controls that are easy to navigate, users can quickly access and adjust audio settings without the need for extensive training. The device supports Extron's Global Configurator and GUI Designer software, allowing for remote control and customization of the audio system easily. This integration is essential for system integrators who want to create tailored solutions for their clients.

The DMP 64 also features an integrated web interface, providing a convenient way to manage the system from any connected device. This capability makes troubleshooting and system management straightforward and efficient, especially for tech support teams who may need to address issues remotely.

In addition, the unit is designed with robust connectivity options, including Ethernet for control and monitoring, as well as standard audio inputs and outputs. Built with reliability in mind, the DMP 64 is housed in a sturdy chassis, ensuring it can withstand the demands of everyday use in professional settings.

Overall, the Extron DMP 64 combines advanced audio processing technology with user-friendly design and features that cater to the needs of today’s audio/video environments. Its flexibility, reliability, and high-quality sound management make it an ideal choice for diverse applications, from classroom environments to corporate meeting spaces. Whether it’s for conferencing, presentations, or events, the DMP 64 stands out as a powerful tool in professional audio management.
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