If it ain't broke don't fix it. You are just reversing the absolute phase by connecting hot to ground [or vice versa] , it can't do any damage. Reversed often sounds better anyway; if I liked the sound I would leave it alone. You can change the subs if you feel comfortable doing so but you don't have to. I run my subs out of phase with the main speakers, which way sounds better depends on the system and room.
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