"Eeyore" wrote in message
...


Godfrey Wilkes wrote:

Anyone familiar with Fostex full range drive units? Wilmslow Audio do
them along with cabinet kits starting from about £200 a pair but I
can't find much in the way of reviews as to how they actually perform
compared to other speakers of a similar price.




From basic priciples of physics it is easy to show that ANY 'full
range' loudspeaker is a terrible compromise. This involves analysis of
motor theory, suspension, resonances, cone break-up and plenty more
besides.

The 'average' speaker tends to perform best over about 3 octaves which
is why most decent speakers are 3 way.

The frequency coverage can be extended a little at the cost of
sensitivity, making some decent 2 way designs possible

Graham

p.s please don't post in HTML in future


Sorry about the HTML. In over 12 years of newsgroup posting I've always
tried to stick to the 'rules' but something went wrong this time! Must have
had a senior moment.

I think you've confirmed my own thoughts on the disadvantages although I'm
led to believe that Lowthers are something special. The only advantage I can
see is high efficiency, in the right enclosure, but with today's high
powered amplifiers efficiency is not a problem.