[nickbatz]

Thiele and Small figured out a relatively small number of parameters that
could be measured on a driver, and then a set of equations that could be
plugged and chugged to figure out the system response of that driver in a
given box. So designers could easily predict what was going to happen before
building anything.

Which is why there was such a dramatic improvement in sound quality of small
vented box speakers beginning in the early seventies.


Great, thanks, will read up on it.

That was right before my short-lived career working in stereo stores.