I'd contact a/d/s/ directly to inquire whether their separate components can handle that kind of power if you're concerned about it, but I would guess that you will be fine.
Actually the dealer who did my installation recommended I do something similar with my system & skip the rear fill speakers. But since my Bostons were only a few years old & performed so well in their previous role as the primary speakers in my Tracer wagon, I simply didn't want to put them away in boxes unused.
1999 SVT Contour, #2140 of 2760, Tropic Green - Medium Prairie Tan
Koni Sport struts; TSW Blade wheels; Nakamichi, a/d/s/, Boston Acoustics, Infinity I.C.E.
1989 Saleen Mustang, #89-0408, too many mods to list here
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