Microphone Controls

Mic on/off

Mic volume and mute are controlled from the front panel. The Mic mute button toggles the Mic input on or off. The corresponding red LED illuminates when Mic volume has been shut off (muted).

When the Mic input is enabled it is mixed with the program audio output. Mic volume is a stepped encoder, adjusted at a rate of 1 dB per step of the control. Clockwise rotation increases and counterclockwise decreases the Mic volume.

MIC

MUTE

Figure 17. Mic volume and mute

Talk-over

The MPS 409 also features talk-over to automatically reduce program audio volume when microphone audio is present allowing the microphone audio to be heard more intelligibly. When the switcher detects an audio signal from the Mic input, it immediately reduces or "ducks" the program audio volume. When microphone audio is not detected for a period of one second, it increases the program audio level at a rate of 3 dB per second until it reaches the original volume level.

The program audio can be ducked from 0-30 dB (default is 6 dB), adjustable through software control only. The Mic level threshold where ducking is initiated is adjustable from 0-15 dB through software control only. See Mic talk-over threshold on page 24 .

Mic volume

After turning on (unmuting) the Mic input, use the Mic volume control knob to adjust the volume of the microphone output. When the control knob is turned, volume increases at a rate of 1 dB per step. The program audio level has no affect on Mic volume.

Setting mic talk-over threshold

Microphone threshold and program audio ducking levels can only be adjusted using RS-232 control. See SIS Programming and Control on page 20 for more information.

1.Adjust program audio for nominal listening levels.

2.Turn on the microphone by pressing the Mic Mute button.

3.Speak into the microphone in a normal voice. The main program level should drop immediately.

a.If the microphone consistently cuts off the beginning of speech, or cuts out sections of audio, adjust the threshold level via RS-232 control. See Mic talk-over threshold on page 24

b.If the program level is too high during talk-over, but is the proper level for times where talk-over is not active, see Program audio ducking level in talk over mode on page 24.

4.Stop speaking into the microphone. The main program audio should gradually increase to the previous level within 2-4 seconds. If not, increase the threshold level. See Mic talk-over threshold on page 24.

MPS 409 • Operation

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Extron electronic MPS 409 manual Microphone Controls, Mic on/off, Talk-over, Mic volume, Setting mic talk-over threshold
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MPS 409 specifications

The Extron MPS 409 is a sophisticated multimedia presentation switcher designed to streamline the integration of audio and video in various environments, such as classrooms, conference rooms, and auditoriums. This versatile device is well-known for its ability to simplify the control of multiple sources and enhance the overall presentation experience.

One of the standout features of the MPS 409 is its extensive input capability. This switcher supports a variety of input formats, including HDMI, VGA, composite, and audio, allowing users to connect a wide range of devices such as laptops, projectors, and document cameras. The ability to switch between different input sources with ease is essential for maintaining a seamless flow during presentations, making it a critical tool for educators and presenters alike.

The MPS 409 is equipped with advanced technologies that ensure high-quality signal processing and transmission. The device supports resolutions up to 4K, providing crisp and clear visuals for viewers. Additionally, the integrated scaling feature allows users to select the optimal output resolution for connected displays, ensuring compatibility with a variety of screen sizes and formats.

Another notable characteristic of the MPS 409 is its user-friendly interface. The front panel features intuitive buttons and an LCD display for easy navigation and control. This design makes it accessible for users of all skill levels, enabling quick adjustments during a presentation without complicated procedures. Furthermore, the device supports remote operation through the Extron Control System, enhancing its flexibility in larger setups.

The MPS 409 also includes built-in audio features, such as an integrated amplifier and multiple audio inputs. This ensures that audio playback is synchronized with video outputs, delivering a cohesive audio-visual experience to the audience. The device's compatibility with various audio formats further enhances its functionality, catering to diverse presentation needs.

In conclusion, the Extron MPS 409 multimedia presentation switcher is a powerful tool that combines extensive connectivity, high-quality signal processing, and user-friendly control. Its versatility and support for advanced features make it an excellent choice for anyone seeking to enhance their presentation capabilities in professional and educational environments.
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