I was also looking at adding a JL F112 to my 2-channel system and was thinking of running my Martin Logan's full range and run the JL below 40 or 50 hz.
I'm running my B&W 800's fullrange while using a F-113 crossed over around 47 hz. It's really easy to tweak this sub to integrate with a two-channel system, even without an active crossover rolling off your main speakers.
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