Subs behind the speakers or behind the listening position worked best in my room.

I have spoken to several well respected speaker desingers and was surprised to find out their tweeters were wired 180* out of phase from the other drivers ? With baffel slope and all the magic (phase shifting) that occurs in the crossover things eventually arrive at our ears on time and in phase.

Sounds like FM to me !

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System Marantz MA9S2, SC7S2,SA7S1, Thiel 3.7's, Nordost, Furman 2ea Elite 15i

I have my pair of subs on plane with my Maggies, and think they are totally integrated with the MGIIIa's FWIW
Regards,
Jim

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It's all about the Music, but I sure like way my gear makes it come alive!
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I find subs usually sound best to the side of the speaker firing out or in front crossfiring from the side. Always away from the corner