As is being repeatedly pointed out in this group, I am something of an
ignoramus when it comes to certain (most) things 'audio' -some because I
couldn't care less about them (CD) and others because I haven't devoted a
lifetime to studying/working in audio and I'm too damn old to start now!

But I do have a couple of questions - surprisingly perhaps, I like Lowther
speakers (as any number of others have done for the last 70 or 80 years it
appears, but there ya go) and I was skimming through this article (yes, I
know....)

http://www.hi-fiworld.co.uk/hfw/olde...hornspkrs.html

The phrase "They are very efficient - in a cabinet, the PM7 hits over
103dB/watt." comes up.

Now, this has always mystified me, especially since I asked an 'expert' at a
famous (but fairly recently changed hands) 'speaker company' about this very
thing and he didn't think the sensitivity of a speaker (Fostex in the
Buschhorn cabinet, at the time) could be changed (increased *or* decreased)
by the enclosure it was used in! So, who is right here? (Makers claim for
the PM7A is a sensitivity of 96 dB at 1m/1kHz/1 watt...)

And this phrase also: "This relied on the same basic twin-cone driver allied
to the new PM4 magnet unit, which has the most unbelievably powerful
gap-flux of 24,000Gauss - stronger than anything else I have ever seen."

....is interesting because one of my pairs of Lowthers has a 'Flux density'
figure of 2.1 Tesla (where 1 Tesla=10,000 Gauss) which is pretty close and
implies *plenty beeg cojones* in some way, but what does it mean? What does
it do? In my ignorance, I imagine it is the 'strength of the return spring'
of the speaker's 'motor' - ie how quickly it can be snapped back from an
excursion??

How silly or wide of the mark is that?

TIA

(It'll be Don, I suspect - if anyone at all....)