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Originally posted by airjosh
A standard room is a perfectly square box with 8 foot ceilings. Not very many people's rooms are exact or "standard". All of that changes in the real world. Again, the math can only take you so far, you need to focus more on the implementation.
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Actually a standard room is simply one that has two side walls where the speakers can be placed equidistant from the center listening position, raised 5-8 feet off the ground. And for the record, a rectangular room is a much, much better acoustical choice of design if you are designing a Home Theater room.
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Dipolar speakers were created to sit inline with the listening postion where they create a null space (the speakers are out of phase). This was done to create a more open, enveloping surround field that is not localized to one side or the other. In some ways this may defeat the purpose of discreet channels, but it certainly was not intended to create a "stereo" surround field. Less localization, not more.
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Creating a "more open, enveloping surround field" made the mono surround channel of Dolby Pro-Logic sound more expansive (or more "stereo", which is inherently more open and enveloping than mono) than it actually was. If your monopolar direct firing surrounds are placed properly, localization will not be a problem.