The triple woofers spec is for the HP drivers. The regular woofers are probably 119.63478W each.

250W is for the whole thing.

Axiom put the dual binding posts on there because customers asked to bi-wire and bi-amp. They didn't want to lose sales. It also makes them look more "upscale" for snobby audiophiles.

Don't waste your time.

House of the Rising Sone
Out in the mid or far field
Dedicated mid-woofers are over-rated