Lots of misinformation, the area of a circle is computed by the formula; radius squared times pi(3.
14), aka pie are square, for example, a 10" would be 5x5x3.14=78.5, a 15" speaker area would be 7.5x7.5x3.14=176.6, air moved by an 8x10 would be 628", for a 2x15 would be 353.2". The actual air...