Fyi

[Watts]

If any one is interested here is a full blown loudspeaker testing software suit. It is totally free. It does however require some additional hardware that can be built from some parts from Radio Shack. My intent here to simply provide a resource to the student or serious experimenter that will allow him or her to produce professional acoustical or loudspeaker measurements on a low budget. Some of the physics people my also find it useful because it is not only limited to loudspeaker measurements but several different applications in acoustics also.

http://www.speakerworkshop.com/