In message , Wally
writes
Wally wrote:

Am I right in thinking that some sort of push-pull set up will give
me a shallower roll-off for a given size? What design approaches are
there, and how do they compare?

Been reading this...

http://www.maximacar.com/isobaric.htm

It says that having the drivers facing towards or away from each other, as
opposed to facing the same way, gives the "benefit of push-pull operation".
Does this have something to do wth the driver having a different response
when the cone moves away from the magnet compared to towards the magnet,
such that having the pair of drivers doing one half of each movenment
reduces the variation in a single driver. Ie, a bit like the idea of matched
valves in a push-pull amplifier giving less variation between the +ve
and -ve halfs of the waveform?


--
Wally
www.makearatherlonglinkthattakesyounowhere.com
Things are always clearer in the cold, post-upload light.




Got it in one! Exactly analogous to push-pull cancelling out even
harmonics in a class-A amp.
--
Chris Morriss