To put all these watts into perspective, if you listen at a moderately loud average sound level of, say, 85 dB at the listening position, and that is, say 4m from the speakers, and the speakers are say a pretty average 88 dB/W sensitivity, the average power being used would be about 4W per channel in a relatively absorbent room… A loud peak at 20dB higher sound level with equal intensity on each channel would require 200W per channel for the transient.
If you only play quietly, say 75dB average, the corresponding figures would be 0.8W per channel average, with transients of 40W per channel on those strong peaks.
But should you play really loud at any time, say 95 dB average (of course unwise fot more than a short time), then you’d be using 40W per channel average, and need 2kW per channel for those very loud peaks not to clip.
These figures of course depend fundamentally on speaker efficiency, and how close to the speakers you listen. Also the room would have an effect - an echoey room would require less power.