Old Wharfedale drivers

[Glenn E]

Hi all, does anyone recognise these old Wharfedale woofer drivers. They are said to be 8 inch. I don't know what model they are from. Keen to know specs and any other info. Glenn

 

[Netlist]

Glenn, could you try changing your image to a bigger one?

Hugo

 

[Glenn E]

Hugo, larger image attached.

 

[Boden]

Looks more like a Leak Sandwich (coned) woofer.

 

[Netlist]

Hugo, larger image attached.

Thanks, but can't help.

 

[Netlist]

A lot of info here of what is indeed probably a Leak:
https://www.time-tunnel.com.au/elec...c-1970s-h-j-leak-sandwich-300-speakers-3-way/

Hugo

 

[Galu]

probably a Leak

From "A Pair of Wharfedales" by David Briggs:

This so-called piston-action sandwich cone drive unit was invented by Don Barlow in 1958 while working for Alcan.

The light but very stiff cone was made from a thick section of expanded polystyrene sandwiched between outer skins of aluminium.

Barlow was induced to move to Leak to develop the drive unit which was launched in 1961.

They are said to be 8 inch.

The 'Sandwich 200' model had an 8 inch version and was rated at 8 ohms, with power handling of 18 watts.

However, its 8 inch driver, shown below, doesn't resemble the driver in Glenn's image:

EDIT: Further research reveals that the above driver has a 170 mm (6.7") cone.

 

[Netlist]

In any case, the link I posted sports what looks like the exact same driver shown in Glenn's picture.
Browse the pictures in the link to find out.

Further down it gives a lot of info among this:
Configuration: 2x 2.5" Drivers 1x 6" Woofer SEALED

So, I think Glenn's woofer is 6".

 

[Galu]

the link I posted sports what looks like the exact same driver shown in Glenn's picture.

The square magnet assembly of Glenn's driver looks oversized in relation to an 8" diameter, so 6" would be closer to the mark.

EDIT: The specs of this Sandwich 300 say it has a 200 mm (7.97") cone so there appears to be two models of these.

 

[Galu]

Further down it gives a lot of info

I think that further down information is simply a collection of 'facts' that the seller has collected off the internet.

The 6" reference would appear to be a mistake as it is at odds with the published specifications for the Sandwich 300 that I gave above.

And, I've found an image showing the Sandwich 300 drivers:

I believe that may completely solve the mystery!

 

[Galu]

Hi all, does anyone recognise these old Wharfedale woofer drivers. They are said to be 8 inch. I don't know what model they are from.

To round the thread off, these appear to be Leak 8" woofer drivers which are from the Sandwich 300 model.

 

[Netlist]

I believe that may completely solve the mystery!

Indeed, looks like it.
And if Glenn owns the drivers, he could measure them.

 

[Galu]

And if Glenn is looking for the T/S parameters, he'll likely have to measure them himself as the 300s were introduced back in 1972.

 

[Glenn E]

Well thank you everybody. That is a very comprehensive response. I don't own them yet but am considering buying them to use in Wharfedale 304 speakers that do not have the original woofer drivers. They should fit the cabinets but the crossover will need to be changed. The tweeters in the 304s are the originals. Glenn