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Re: Wharfedale 12/cs/al t/s( 1959-1961 type)

Posted by Bold Eagle (A) on May 23, 2004 at 16:42:56

In Reply to: Wharfedale 12/cs/al t/s( 1959-1961 type) posted by tdc on May 23, 2004 at 13:58:45:

I used one of the 12/fs/al models in the late 50's and into the early 60's in an E-V Aristocrat corner horn kit. Yours should be very similar. Unless the cabinets were sealed, in which case it isn't (see below) The CS stands for cloth suspension, the al is aluminum wire voice coil, my FS was foam suspension, which rotted. I'm not sure what the t/s signifies. They are very good sounding full range with fantastic transient response, but with very limited high end dispersion. The corner placement reduced the need for broad dispersion. The bass free air resonance should be noted on the cone in white ink. Also look for the initials. mine was signed by G. A. Briggs (GAB). You'll also find Cooke's initials. He founded KEF later on.

The magnet is AlNiCo 5, very heavy, with Puron (very pure iron) end plates, and lots of stray flux. The tip of the pole piece is driven into saturation at 17,500 Gauss. I could pull open a pocket knife blade on the edge of rear plate. Don't get them anywhere near a TV or computer monitor. The very high flux density means lots of back EMF which severely restricts bass response. So the speaker needs a ported or horn loaded cabinet to develop any real bass. However, if the W70 cabinets are sealed, then the flux cannot be that high, or the Q will be too low for a sealed box.

There was a 12" woofer as well, but as I recall, it had a square magnet. At least my W15/fs did and I'm pretty sure the 12" did as well.

The 10" 10/cs/al was a nice speaker as well. Is that what you have in those boxes?

Jerry

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