As a result of a slightly off topic discussion I was told about this white paper which researches multiple sub placement. My question is directed to those that run multiple subs. Where do you have yours? The white paper concludes that the best placement is in the middle of the front and back walls for two subs. They also play around with 4 and even 5000 subs but real room testing concluded two was the most practical. My Tempest has not moved far from the front left corner for some time now. The Shiva has moved from behind the second row of seats to the back wall and now on the right corner of the front wall. Every time I move it I have to change the EQ. I like where it is now but I never actually took measurements with it on the back wall so I'll probably try it again. You elitists with dedicated rooms can chime in but I'm most interested in those, like me, who've had to put up with non-rectangular rooms.