Where did you get the Baranek book??
Other than me and Nosaine I didnt think anyone else
had that book... ha ha

Scott Gardner wrote:

On Mon, 29 Dec 2003 21:34:32 GMT, Eddie Runner
wrote:

Yep, there were several caveats that were listed in the paragraph I
quoted from "Acoustics" that I didn't explicitly address. The
speakers must be facing the same direction, and close enough to each
other for the synergistic effect to take place. (This is trivially
easy for subwoofers, almost impossible for tweeters.)

I would assert that "adding one sound to another sound of the same
amplitude" is equivalent to doubling the input power, **as long as**
you're still within the linear operating region of the subwoofer. Of
course, it's still only a theoretical maximum of 3 dB, and will depend
largely on the loudspeaker.

To paraphrase the "Acoustics" quote, with some of the caveats
emphasized-- Two speakers, identically powered, close to each other,
producing bass frequencies, and in-phase with one another will produce
four times the sonic intensity (+6 dB) along their principle axis when
compared to a single loudspeaker.

Scott Gardner