Originally Posted By: JohnK
Headroom is the power available above the typical 1 watt (not the maximum continuous rating) used at a comfortably loud level.

That one sentence answers a lot of questions wink

Thanks !

M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8