For starters no square rooms or rooms with evenly divided dimensions, like a room 8'hx16'wx24'L. Bad for low frequencies.
Columns on long walls break up reflected sound waves. Heavy, full pleated drapes on windows will do the same thing as well. As will bookcases loaded with different sized books.
Hat channels are aluminum ceiling and/or wall framing members to which sheetrock is screwed to.
I have a vaulted ceiling, it eliminates one set of parallel surfaces(floor/ceiling) which cause reflected waves.
Placing subs on corners increases the sub's output, and using multiple subs, up to 4, will smooth out the low frequencies. This greatly enlarges the "sweet spot".
Here is a white paper from Harman International about subwoofer placement.
http://www.harman.com/wp/pdf/multsubs.pdf
Columns on long walls break up reflected sound waves. Heavy, full pleated drapes on windows will do the same thing as well. As will bookcases loaded with different sized books.
Hat channels are aluminum ceiling and/or wall framing members to which sheetrock is screwed to.
I have a vaulted ceiling, it eliminates one set of parallel surfaces(floor/ceiling) which cause reflected waves.
Placing subs on corners increases the sub's output, and using multiple subs, up to 4, will smooth out the low frequencies. This greatly enlarges the "sweet spot".
Here is a white paper from Harman International about subwoofer placement.
http://www.harman.com/wp/pdf/multsubs.pdf