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

"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.


--
Woody

"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.


--
Woody

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

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

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

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

Dave Plowman wrote:

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.


This could be what you are looking for:
http://www.geocities.com/thevenialcritic/w2.jpg

An advert from Practical Electronics, June 1966.

The standards required weren't so different.
It's just that many manufacturers were selling crap.

--
Roger.

Dave Plowman wrote:

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.


This could be what you are looking for:
http://www.geocities.com/thevenialcritic/w2.jpg

An advert from Practical Electronics, June 1966.

The standards required weren't so different.
It's just that many manufacturers were selling crap.

--
Roger.

"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.