In article ,
Oddjob wrote:
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!

It's a so called wide range unit. But the standards required of HF
response in those days were rather different - I'd expect it to be perhaps
10dB down at 10kHz - and only that good directly on axis.

Home brewed designs for this sort of speaker would often include a
special amp with a tailored response to help hide the deficiencies, as it
were.

--
*Be nice to your kids. They'll choose your nursing home.

Dave Plowman London SW 12
RIP Acorn