In message , Mike Coatham
writes

"Chris Morriss" wrote in message
...
In message , Mike Coatham
writes
snip

1" voice coil, 13,000 Gauss field strength. Total Flux 54,000 Maxwells
(In old pre-SI units)

I've probably got the Fs frequency somewhere.
--
Chris Morriss

That's interesting 'cos the 1971 HiFi Yearbook has them listed as 1"
Voice
Coil(Aluminium) , Gap Flux 14,500 Gauss. Total Flux 60,000 Maxwells.
Paper
cone with double diaphragm. H.C. 6 watts RMS 12W Peak. FR 40-20,000Hz.



I got my data from an article by Gilbert Briggs. (Founder of
Wharfedale). They made them with both copper and aluminium voice coils.
The magnet might have been stronger in the later (1970s) ones.
--
Chris Morriss

Had another dig through my HiFi Yearbooks........the specs I quoted earlier
were in every issue from 1964( That's the earliest one I have - they could
be listed in earier issues, but I can't verify that) until 1975........
1976 onwards = oblivion ?



Briggs (in a photocopy of some pages from 'Loudspeakers' says that the
spec quoted is for the Super8 CS AL (Cloth surround, aluminium coil),
and that the RS (doesn't say anything about the DD) shares the same
AlNiCo magnet and basket.

Now as far as I know, the later Wharfedales used a ferrite magnet, but I
have no data on those.

The old 50s and 60s Hi-Fi year books I had, I sold on Ebay for rather a
lot of money so I can't look up the specs in there.

The RS-DD may be a different beast, if so mea culpa.


--
Chris Morriss