It's also interesting to note that some (all?) Bryston speakers have flat listening window curves. Was this done for marketing reasons or do Bryston owners have more dampened rooms that demand a flatter curve rather than the 3dB/decade attenuation I described in the last post?
BTW, the Family of Curves is not unique to audio. There are for example families of curves for flow rate vs. pump pressure for various RPMs. There are families of curves for chemical sensors. Even transistors, other semiconductors and passive components. What's unique about audio though is that the curves need to be interpreted through the lens of subjective descriptions provided by trained listeners.
