I really hate it when voices try to sneak through my sub. And if I cross at 80hz, sometimes they try. So I use an M3 for center crossed at 60 and no voices! And the M3s happily cross at 60 and still have plenty of bass available down there so....no itty-bitty sound from the center, and no distracting voices from the sub, which may sound theater-like; but can tend to occasionally foil the dialog.

Best of both worlds!