Extron electronic SW AV manual Optimizing the Audio Audio Switchers, Memory

Operation, cont’d

Executive mode (front panel security lockout)

Audio switchers have an executive mode that limits the operation of the SW AV switcher from the front panel. When the switcher is in executive mode, the I/O button (video/audio/video and audio selection), toggling between autoswitch and normal mode, and all of the front panel audio gain and attenuation functions are disabled.

Toggle executive mode on and off as follows:

1.	Press and hold the Mode (Input 1) button.
2.	Press and release the Input 4 button. The Executive Mode LED changes state.
	If executive mode was off, the LED turns on to indicate that the switcher has
	entered executive mode.
	If executive mode was on, the LED turns off to indicate that the switcher has
	left executive mode.
3.	Release the Mode button.

Memory

Audio and mode settings are saved in nonvolatile memory. When the switcher is powered off, the settings are retained. When the switcher is powered on, the saved memory settings are active. The selected input is not a saved value; when the switcher is powered on it, defaults to input 1.

If a video switcher is powered off in auto mode, it automatically switches to the highest-numbered input with video sync pulses present when it is powered back on. If no input has video present, all input select LEDs are off (only the Power LED is on, if equipped).

Optimizing the Audio (Audio Switchers)

Each individual input audio level 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. Adjust the audio gain and attenuation as follows:

1.	Connect audio sources to all desired inputs and connect the audio outputs to
	output devices such as audio players. See Audio input and output connections
	(audio models only), in chapter 2, Installation. For best results, wire all of the
	inputs and the outputs unbalanced.
2.	Power on the audio sources, the switcher, and the audio players.
3.	Switch among the inputs (see Switching inputs, in this chapter), 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 audio level of each input (see Adjusting audio gain and
	attenuation (audio switchers), in this chapter) so that the approximate output
	level is the same for all selected inputs.

3-12 SW AV Series Switchers • Operation