Having the speakers set to large with highly dynamic blu-ray soundtracks could cause stress or compression due to some low-frequency content at loud volumes being sent to the mains or possibly inducing amplifier clipping damaging the tweets. Mid to low frequencies is what could really cause the current demand to ramp up, particularly problematic with a run of the mill AVR (clipping, overheating)
I can attest to this about BD audio. The new Star Wars Blu-rays kept overheating my Onkyo despite the mains being set to small but with a 40 Hz crossover. So they don’t even have to be set to large in my experience. Note that this happened to a receiver that I tested at 100dB for one and a half hours playing very bass heavy trance music.
