Adjusting Pre-mixer Gain

After setting input gain, add desired processors into the input signal chain (see figure 58 on page 88). The pre‑mixer gain control (B) is used to compensate for level changes due to processing. Adding a compressor generally reduces the signal level, while a filter can boost or cut the overall signal level. When changes are made to filter settings after setting dynamics processors, re‑check the levels in the dynamics processors to make certain they are still valid.

NOTE: This procedure is valid only when there is no active processing in the output signal path and if the post-matrix trim value is set to 0 dB, unity gain. If processors are inserted in the output signal path, engage Bypass to temporarily remove them.

To adjust pre-mixer gain:

1.Open the line input gain (A), output volume (E), and pre-mixer gain (B) dialog boxes.

2.Connect program material (or pink noise) at the input.

3.Set the output volume to 100% (mute if necessary).

4.Adjust the pre-mixer gain (B) so the meter level on the input gain dialog matches the meter level of the output volume dialog. This maintains the audio at an optimal level in the input signal chain.

This sets a good starting point. After setting up the microphone input gain and mix‑point levels, output processing, and trim levels, if more headroom is required to prevent clipping at the outputs, return to the pre-mixer gain controls (B) and lower each one by specific amounts. Further minor adjustments to the pre-mixer gain controls help to balance perceived audio levels of the different inputs.

When using the pre-mixer gain for output volume control, the procedure can be reversed. Set pre-mixer gain to 0 dB. With program material (or pink noise) present at the input, adjust the output volume until the meter level in the output volume dialog box is below clipping (or ideally, matches the level at the input gain meter).

Setting Output Gain Structure

Add all desired processors into the output signal chain. Keep in mind that a filter can boost or cut the overall signal level and adding a compressor generally reduces the signal level. Inserting either or both can require resetting of the output volume.

Since a limiter is the most likely choice for output processing and can only reduce the signal to prevent overload, a reduction of output level does not have to be considered. Loudness boosts the overall signal level, but only at lower volume settings.

After adding processors to the output signal chain, the output volume level can clip when set to 100% (or less). Floating point DSP allows clipping to be overcome by lowering the output volume (E) setting. However, unless a user is prevented from changing the volume setting to 100% (or to any position where clipping occurs), it is best to adjust the pre‑mixer gain (B) or post-mixer trim (D) control to prevent any possible clipping.

Alternately, use the post-mixer trim controls to adjust output volume. Post-mixer trim controls provide 12 dB of gain, so use a group master with soft limits to control levels, setting an upper limit of 0 dB or less. Mic levels also contribute to clipping at the outputs, and can need lowered to maintain the balance between program material (line outputs) and voice.

DMP 64 • Software Control

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Extron electronic DMP 64 manual Adjusting Pre-mixer Gain, Setting Output Gain Structure
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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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