Adjusting the pre-matrix

Setting the input and output gain structure

Before calibrating loudness, set up the system gain structure.

1.	Set the signal generator to output -10 dBFS or use recorded program material
	at -20 dBFS.
2.	Set the input gain in the DSP Configurator so that the input meter reads
	-20 dBFS.

NIn step 3, if using a recorded source and the player has an output level setting control, ensure that the output of the player is set to its maximum, or 0 dB of attenuation.

3.	For program material, set the input level to approximately -15 dBFS, with
	peaks at no more than -5 dBFS to -3 dBFS. This setting provides enough
	headroom to accommodate transients or unanticipated loud events in the
	program material in order to avoid possible clipping.
4.	Tie the audio from the source to the speakers that will carry program material
	in the room to be calibrated.
5.	With the output channel volume set to -20 dB, listen to the audio output while
	you set the external amplifier so that the source material plays at a volume
	level that is reasonably loud but tolerable, while verifying that the amplifier is
	not clipping by observing the amplifier clip indicator.

The pre-matrix trim control can be used to compensate for any level changes caused by signal processing before the trim control. Adding a compressor generally reduces the signal level, while a filter can either boost or cut the overall signal level.

NThis procedure is valid only if no processing is active in the output signal path, and if post-matrix trim value is set to 0 dB (unity gain). If you have processors inserted in the output signal path, open them and bypass them to temporarily remove them from the signal path.

1. After you have set the input gain, add any processors that you wish to use into the input signal chain.

TIf you make changes to filter settings after you have set your dynamics processors, recheck the levels in your dynamics processors to make sure that they are still valid.

2.	Open the line input gain dialog box, the output volume dialog box, and the
	pre-matrix trim dialog box.
3.	Set output volume to 100%. If the audio is too loud or distracting, mute the
	output.
4.	With program material (or pink noise) present at the input, adjust the pre-
	matrix trim so that the meter level in the output volume dialog box matches

the meter level in the input gain dialog box. This maintains the audio at an optimal level in the input signal chain.

TThis is a good baseline. If, after you’ve set up your microphone input gain and mix- point levels, output processing, and post-matrix trim levels, you find that you need more headroom to prevent clipping at the outputs, return to the pre-matrix trim controls and lower each trim by the same dB amount.

You may also find that further minor adjustments to the pre-matrix Trim controls help to balance out the perceived audio levels of the different inputs.

MPX Plus 866 A Media Presentation Matrix Switcher • Switcher Software 5-37

PRELIMINARY

MPX Plus 866 A specifications

The Extron MPX Plus 866 A is a powerful multimedia presentation switcher designed to meet the needs of modern AV environments. This advanced device simplifies the management of multiple audio and video sources, providing seamless control and connectivity in various settings such as conference rooms, classrooms, and auditoriums.

One of the key features of the MPX Plus 866 A is its ability to handle a wide range of video formats. It supports both HDMI and analog video, allowing for compatibility with different devices. This versatility ensures users can connect laptops, projectors, and other AV equipment without any issues, making it ideal for mixed-use environments where various technologies coexist.

With an 8x8 matrix design, the MPX Plus 866 A can route up to eight different input sources to eight output destinations. This feature enables users to select and switch between sources quickly and efficiently, enhancing the overall presentation experience. Additionally, the device incorporates Extron's high-performance scaling technology, which ensures that video signals are processed with exceptional clarity and detail, regardless of resolution.

Another noteworthy characteristic of the MPX Plus 866 A is its built-in audio capabilities. The switcher includes a comprehensive audio mixer with support for both analog and digital audio signals. This allows users to integrate and control audio sources effectively, ensuring that sound quality matches the visual experience. Furthermore, it features advanced audio processing tools, including equalization and filtering functions, to enhance audio output in any environment.

The MPX Plus 866 A also emphasizes ease of use and accessibility. Its user-friendly interface, combined with an intuitive control system, allows operators to navigate the device with minimal training. Additionally, the switcher supports various control options, including RS-232 and Ethernet, enabling integration into larger AV control systems for centralized management.

In summary, the Extron MPX Plus 866 A stands out as a versatile and reliable multimedia presentation switcher. Its extensive range of input and output options, advanced scaling and audio processing technologies, and emphasis on user-friendly design make it an exceptional choice for any professional AV installation. Whether in an educational setting or corporate environment, the MPX Plus 866 A ensures seamless connectivity and high-quality performance, meeting the demands of today’s multimedia presentations.

Extron electronic MPX Plus 866 A manual Setting the input and output gain structure

Models: MPX Plus 866 A

Setting the input and output gain structure