Can an amp pull 1500 WPC from a regular household wall socket?Not for very long, without tripping the breaker. However, it may not have to.
1500 watts per channel is a total output of 3000 watts. Assuming the amp is 95% efficient, which may be optimistic, it would draw 3000/0.95 = 3158 watts from the wall outlet to provide 1500 WPC. 3158 watts at 120 volts is 26.3 amps.
That would trip the breaker if drawn for a significant amount of time. Also, if it is drawn just occasionally, on musical peaks that are brief enough to not trip the breaker, it would probably cause the line voltage at those instants to drop by a few volts or so, depending on the length of the wiring between the outlet and the breaker panel. That voltage fluctuation might have audible consequences in some or many systems.
On the other hand, depending on speaker efficiency, listening volume, the dynamic range of the music you are listening to, and other variables, you may not actually utilize a lot of the power capability of the amp, which would reduce the amount of current that it draws from the wall outlet correspondingly.
Regards,
-- Al