In message , Mike Coatham
writes

"Chris Morriss" wrote in message
...
In message ,
harrogate writes

"Chris Morriss" wrote in message
...
In message , Oddjob
writes
Hello all, I have a pair of loudspeakers in walnut cabinets.
I couldn't find the tweeter by feeling around the front - the grills
don't
come off.

I opened them to find wharfedale super 8 / RS / DD drivers inside. A
friend
has told me that they are 1970's with tweeters "built in" to the
woofer!

Can anybody shed anymore light on these speakers?
I don't think they can handle much power as they distort quite easily
:-(

Thanks



They are nice high-quality drive units from the 60s and early 70s.
They
are twin cone units. They roll off at 12kHz or so, so a
high-efficiency
tweeter might be useful.

You'll find quite a lot of info on the web about them.


--
Chris Morriss


Actually known as the Wharfedale Super 8 RSDD - for roll surround doped
(or
was it double) diaphragm.


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