Woofer size and power usage.

[SabreWulf69]

So as long as the voice coil increases in size proportionately along with the size of everything else in the larger driver not just in 'steps' of inches compared to the smaller driver i.e. just larger for the sake of more power handling when you give the smaller and the larger driver the same amount of power they will be equal to the same loudness, correct? I can see some downfalls of this as mentioned with power compression from over-excursion if all competing drivers are being driven to their limits.

Also, with SPL, (just an example) would a 500W 8" sub put out the exact same amount of volume as a 500W 12" sub without over-excursion when driven with identical loads? Realistically would you really expect to see a 8" driver having higher or equal operating mechanical and electrical limits compared to a similarly priced 12" driver? Also with damping factor, aren't larger loads (specifically the relationship with impedance changing with frequency) more demanding from larger speakers than smaller? I am also guessing that with frequency changes speakers can become (depending on size) more or less sensitive and efficient.

I guess the aim to designing a good speaker is getting as close to a hypothetical perfect speaker which has perfect infinite pistonic motion across the entire frequency spectrum with infinite stiffness and zero mass as much as possible.