Charles, I'll comment on a couple of the points raised. For an SPL meter get the Radio Shack digital model, which is easier to read and has additional measuring modes that the analog meter doesn't.
If you're planning that fiberglass boards will be significantly effective at low bass frequencies, you'll need a lot more of them than you're probably thinking. As Dr. Toole points out, fiberglass or foam panels would have to be very thick to be effective at very low frequencies. The requirement would be about 1/4 wavelength, which at 40Hz, for example, would be about seven feet. There are other types of traps which use resonant membranes to absorb some of the bass energy(as more flexible walls also do)and which are more effective(but also more expensive)at reasonable sizes than fiberglass or foam.
