Try it both ways and see which you like better. And just because the crossover is at 80hz doesn't mean the dual 8" woofers are not doing anything. They don't cross over to the tweeter until 1800hz. So they are working for another 1720hz or more (since the 80hz is not a brick wall).
Also, run your AVR's room correction and see what you get.
Klipsch RF-62II, RC-500, RS-400, SVS PC12+,
Def Tech SC8000
Harman Kardon AVR 1600
PS3, Apple TV, Sharp 70" Qattron