AVS Special Member
Join Date: Aug 2004
Location: sierra ecuadoriana
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Not the same thing. You could place the sub in many locations around the room, and all could be the same distance from the seat. Lets say 12 ft.
But only when the sub location is near the mains (preferably in between) the phase is 0.
If the sub is along one of the side walls or in back, then the phase most likely needs to be 180.
Custom, one of a kind pair, MJC212 mains, mod PT800 center, PT800 surrounds, SUB1500s. Parasound P7, Citation 19, Parasound HCA2205A, HK AVR3600, Marantz TT, Denon disc player, MacBook Pro w/ DragonFly usbDAC.