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Operation, cont’d
SW AV Series Switchers • Operation3-12
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.