Hi Jamie,
I have the ATH-AD700 headphones. People seem to agree that these are light on bass, and definitely the BSC made a very audible difference. The lower registers are much more apparent, and the spectrum was filled. The same levels I used for my speakers worked best here (narrowest baffle, 4db). I had a much harder time discerning differences with the treble compensation. I ended up setting it at 20kHz, 4dB. At this setting, I could hear the ringing in the higher notes (e.g. classical guitar harmonics), but it's very subtle. I hope this is a reasonable description.