[Scott Dorsey]

nickbatz wrote:
Pretty normal when the T/S parameters aren't suitable for a small box.
You often get higher efficiency than a smaller driver, but not
necessarily lower bass.

I know everything.

That is, except for what T/S paramaters are.

You can basically split all small speaker designs into two eras: before the
thiele-small paper, and after the thiele-small paper. Before Small wrote
a series of articles in the JAES expanding the work of fellow-Australian
Neville Thiele, people designed vented boxes pretty much by trial and error.
The manufacturer made a driver, they put it in a box, they tried different
volumes and portings and maybe adjusted the stiffness of the suspension, but
it was pretty much a matter of just trying things until they worked.

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.
--scott


--
"C'est un Nagra. C'est suisse, et tres, tres precis."