Yep, I love Speakerworkshop! Its like a kind of addiction ey, its just so cool I can make these measurements myself now. Thanks for showing me how to use SW by the way.

I kept everything the same during the tests. Same range setting on RS meter, same volume setting on amplifier, same mic distance (it was never moved), the line-in and I/O volume in SW kept constant, and all bass/treble controls set to flat so the measurements could be compared.

That last paragraph you wrote looks like a good description of whats happening. Perhaps I'll take more measurements with different sized back chambers sometime.

Who knows what will become of my SW addiction; maybe I will start measuring all the speakers in my house, good and crap, just for fun :P

Cheers,
Adrian