• www.kettering.edu/~drussell

He also has a good document about transmissions lines:

• Acoustic High-Pass, Low-Pass, and Band-Stop Filters

Here's an excellent write-up on how to measure polar response of loudspeakers:

• Measuring the Directivity Patterns of a Loudspeaker with and without a Baffle

And several other good lab excercises:

• Acoustics, Noise, and Vibration Lab excercises