The infinity's are the old style Reference with the white cones right? They slammed pretty good, I'd say put them in.
I don't know anything about the lightning audio's so...
O really? Those are GREAT sq woofers, I have one I'm repairing for someone, I've been playing around with it //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif. They are better at making sound not moving air, so putting them in an enclosure that takes advantage of their... I don't know what to call it, they remind me of band equipment woofers, they make alot of sound without an enclosure.