Extron electronic MVX 88 Series ユーザーズマニュアル

Each individual input audio gain can be adjusted within a range of -18 dB to +10 dB 

to eliminate noticeable volume differences between sources and to achieve the best 

headroom and signal-to-noise ratio.  Adjust the audio level as follows:

. 

Connect audio sources to all desired inputs and connect the audio outputs 

“Installation”.  For best results, wire all of the inputs and the outputs balanced 

when possible.

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Power on the audio sources, the switcher, and the audio players.

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Apply audio signals to all inputs to be optimized.

. 

In Audio Setup mode (see “Adjusting input audio gain and attenuation”, on 

page 3-18) select among the inputs while observing the front panel Power 

LED.  The LED blinks at a rate that corresponds to the highs and lows of the 

audio signal.

. 

As necessary, adjust the audio gain of each input so that the Power LED blinks 

frequently for all selected inputs.  If the LED is lit most of the time, the level is 

probably too high; if the LED rarely flashes, the level is too low.

 

As an alternative:
•  If necessary, temporarily set the output 1 level to the consumer (-10 dBV)

•  Measure the output 1 audio level (in Audio Setup mode, the selected input 

is tied to output 1) with test equipment, such as a VU meter, or listen to 

the output 1 audio with a critical ear.

This section gives recommendations on what to do if you have problems operating 

the MVX Series switcher.

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Ensure that all devices are plugged in and powered on.  The switcher is 

receiving power if the power LED is lit.

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Ensure an active input is selected for output on the switcher.

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Ensure that the proper signal format is supplied.

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Check the cabling and make corrections as necessary.

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Call the Extron S

3

 Sales & Technical Support Hotline if necessary.