80% of audio depends on the room just like 80% of fitness depends on how and what you eat and drink. 80Hz crossover sounds good in your room but in my home theater 60Hz sounds best. Others may cross over lower and hence may want the best possible fidelity at elevated sound pressures which may push them to HP drivers. I surmise the HP drivers came out of the Bryston Model T research which Axiom subsequently decided would be a good idea to incorporate in their models to limit low frequency dynamic compression at higher powers. We have to remember that just because a speaker is rated at 400W, it doesn't mean it's linear to 400W. It just means it can consume that power without damage.
