I read a bit about audio power amplifiers and struggle to understand the power rating of the emitter (i.e. current sharing) resistors in power amplifiers.
Schematics and BOM below: all credits and copyright go to buildaudioamps.com
According to the BOM, the resistors R31-R34 are chosen to have a 5W rating (wirewound type). I have done some simple Spice simulation and I see that at the maximum (reasonably usable) input voltage, the power dissipation across a single emitter resistor is only about 500mW, which is to be expected because of their low value.
Somehow I have the feeling, that the guy has an idea of what he is doing.
What is the reason for the chosen power rating?