On Sat, 11 Apr 2009 09:55:51 +0100, "Dave Plowman (News)"
wrote:

In article ,
Keith G wrote:
What goes against you, however, is that Lowthers have been making
speakers without major redesign for getting on for a century and people
have been (presumably) buying them, so they can't be anything like as
bad as you would try to have others believe - the usual *feeding
frenzy* for nice Lowther units on eBay kinda says it all, really....

No moving coil speaker ever has had a 'major redesign' Since they all
follow the same design. The differences are simply tinkering with that
design.

And Lowther has tinkered with that design as much as any.

And the design process is still the same. Choose the major mechanical
parameters to place the first resonance at an appropriate frequency,
then fiddle with the cone design to try and stop it breaking up too
disastrously, at too low a frequency. Next step (for most) is to
recognise that it can't be done, so use multiple drivers each
optimized for their particular range instead.

d