OK let me try to clarify few things in my mind.I’ve only ever seen the input sensitivity (in volts or millivolts) for amps as stated for the amps full wattage output just before clipping. Unless specifically stated for only 1 watt of output
I assume every amplifier manufacturer gives the input sensitivity
Speakers sensitivity (where you maybe getting confused) is stated as sensitivity in dB for for 1watt input .
Cheers George