Extron Electronics MAV Plus Series User Guide - Manual (Page 89)

Optimizing the Audio (Audio Models)
The level for each analog audio input can be adjusted within a range of -18 dB to +24 dB,
so there are no noticeable volume differences between sources and for the best headroom
and signal-to-noise ratio. The volume for each analog audio output can be adjusted from full
loudness to effectively muted. Adjust the levels as follows:
1. Connect analog audio sources to all desired inputs and connect the analog audio
outputs to output devices such as audio players (see
Audio input and output
(audio models) on page 24). For best results, wire all of the inputs and the outputs
balanced.
2. Power on the audio sources, the switcher, and the audio players.
3. Switch among the inputs (see Creating a Configuration on page 42), listening to the
audio with a critical ear or measuring the output audio level with test equipment, such
as a VU meter.
4. As necessary, adjust the input audio level of each input (see Viewing and Adjusting
the Input Audio Level (Audio Models) on page 63) so that the approximate output
level is the same for all selected inputs.
5. Tie an audio input to each analog audio output.
6. As necessary, adjust the output audio level of each output (see Viewing and
Adjusting the Analog Output Volume (Audio Models) on page 68).
Troubleshooting
This section recommends what to do if you have problems operating the switcher and it
describes an actual image problem that Extron has encountered.
1. Ensure that all devices are plugged in and powered on.
2. Check to see if one or more outputs are muted.
3. Ensure an active input is selected for output on the switcher.
4. Ensure that the proper signal format is supplied.
5. Check the cabling and make corrections as necessary.
6. Call the Extron S3 Sales and Technical Support Hotline if necessary. See the end of
this guide for the phone number in your region of the world.
Plasma Display S-video Problem (CrossPoint Switchers)
Extron has encountered a problem when a CrossPoint 450 Plus or CrossPoint Ultra switcher
routes S-video that is output by some video conference codecs. Some codecs change the
DC offset on the chrominance (C) so that it is very different from the level on the luminance
(Y). This can cause a plasma display to come up in the wrong size mode.
With the matrix switcher taken out of the system, the plasma works fine. It looks like a
problem with the matrix switcher, but it is not. The matrix switcher boosts the bad codec
output, which makes the plasma go to the wrong setting.
Solution: Try placing an Extron video DC block adapter on the luminance (Y) input to the
switcher from the codec.
CrossPoint and MAV Series Matrix Switchers • Operation 83