The key switch is the master switch for the entire system. Please be gentle when you turn it - if we lose that switch we've got problems! When you turn the key, a device call the sequencer begins turning the components of the system on in a predetermined order. This prevents "thumping" the speakers and it also prevents an enormous current inrush that would happen if all the amps were activated at once. When you switch off, it essentially reverses the process, making sure the speakers don't get "thumped".
It is good practice to make sure the master fader is all the way down prior to start-up.
Jim K.
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