Turn on is a big power hit with Adcoms for sure. When I sequence the 585 on it dims the lights in the master bedroom. Never tripped a breaker though.
I did a test and powered up three Crown CE2000's at once and tripped a 20A 120V breaker. The CE4000's have a Class D style power supply and soft start so I didn't try them.
The I-Tech's soft start also.
Not all breakers are created equal. There are "high mag" breakers for high current start devices like electric motors, AC compressors and such and would be a good match for power amplifiers. These are not available for all residential breaker boxes though.
One other thing that affects a breakers trip threshold is its trip history. They get softer when tripped often. You can also buy breakers that are switch duty but again, not for all residential boxes.
Barry.