You will get some bass reinforcement under the eave, which is generally a good thing for outdoor placement. And while they will stand up to the elements well, protecting them from the constant battle can't help but extend their useful life.

Panny 3000 PJ, 118" Carada, Denon 3300, PS3, Axiom QS8, PSB 5T, B&W sub, levitating speaker wire