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Somewhat unknown KEF model speakers?

 
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tomsie1000
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Joined: 26 Jun 2006
Posts: 1

PostPosted: Mon Jun 26, 2006 4:50 pm    Post subject: Somewhat unknown KEF model speakers? Reply with quote

Hi All,

I used to have some KEF speakers which I assume were from the 70's or 60's.. not sure. They were second hand and have since left my posession, but I am on the lookout for more as they were by far the best speakers I have ever had. The KEF site museum is of no help and I am really at a loss. I was told that they were a K2 - this may be speculation by that person as I can find no trace of this model number.

They had some rather striking features, which lead me to believe they may have been a custom job. They had the oval driver, I have found identical units to SP1044. The tweeters were a 'dome' type and I have found no trace of similar units. Interestingly, the woofers were partially covered by the face of the speaker, 'bridging' between the sides of the unit. The face had a KEF logo but there were no model numbers or serial numbers to be found. The strangest thing of all about these speakers was that they had a very bright orange laminate plastic material on the rear.

They do look similar to the K1 units on the KEF website, but I am really at a loss as to what they truly were.

Anyone have any ideas/experiences/knowledge of these or similar speakers?

Thanks
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speakerguru
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Joined: 18 Nov 2005
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Location: Green Hut, Tovil

PostPosted: Tue Jun 27, 2006 12:48 pm    Post subject: Reply with quote

Historicaly significant and a bit of a curiaosity. All the very early KEF speakers used a combination of T15 tweeter and a flat diaphragm woofer of some sort. It was original and a great marketing story.

The reason for the woofer "bridging" was that those flat expanded polystyrene diaphragms have horrendous undamped resonances above around 800Hz, the T15 type tweeters could not be used below 1 to 2 kHz and the combination resulted in an awful midrange. So, to make at least the measured on axis frequency response look half respectable, a combination reflector/refractor was used.

If you really liked the sound of that particular ancient midrange compromise, you could always try a pair of Concertos and disconnect the midrange section. (it's not what I'd call hi-fi or a true-to-life sound on vocals and acoustic instruments, but hey, each to his own Wink )
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