I just took a peek at the manual for the Crown Com-Tech amps. Check out the current draw for a 1600 at 50% duty cycle [on page 43 on manual K-80636]. That "pop" when somebody plugs into a live input is easily equal to 50% duty... probably more!
If these are the 120V units, it is close to 20 amps. If they run on 240V, it is only about 9 amps.
But blowing the breaker is only a symptom. As others have said, you need to figure out how to stop people from plugging into inputs that are live. They have actually been lucky so far...
Jim
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Speaking from a secure undisclosed location.
