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Kef Dual Concentrics

 
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lexi
Junior Contributor 10+


Joined: 09 Nov 2008
Posts: 13

PostPosted: Tue Nov 11, 2008 8:57 pm    Post subject: Kef Dual Concentrics Reply with quote

What`s with this new (to me) line of speakers from KEF? I am really on the lookout for an older model having always liked the smooth and uncoloured delivery. My speakers are 15 inch Tannoy DC`S. The Kefs will go in another system.

I don`t imagine the Kef DCs sounding like Tannoy as the top speakers from each respective company have been so different over the years.

Any thoughts.
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speakerguru
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Joined: 18 Nov 2005
Posts: 954
Location: Green Hut, Tovil

PostPosted: Thu Nov 13, 2008 2:07 pm    Post subject: Reply with quote

So the dinosaur has surfaced, eh? Laughing
See http://www.kef.com/France/technology/uniq/qwpintroduction.asp for an explanation of Uni-Q. It's not just dual concentric or co-axial. It's co-incident. Only possible after the development of Neo magnets in the 80s. Before that, the Tannoy tweeters used to have a large magnet so that the tweeter was behind the woofer and all the high frequencies had to go through a collection of drillings in the woofer pole piece.
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proffski
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Joined: 22 Aug 2003
Posts: 1296
Location: Tewkesbury UK

PostPosted: Thu Nov 13, 2008 7:31 pm    Post subject: Reply with quote

speakerguru wrote:
So the dinosaur has surfaced, eh? Laughing
See http://www.kef.com/France/technology/uniq/qwpintroduction.asp for an explanation of Uni-Q. It's not just dual concentric or co-axial. It's co-incident. Only possible after the development of Neo magnets in the 80s. Before that, the Tannoy tweeters used to have a large magnet so that the tweeter was behind the woofer and all the high frequencies had to go through a collection of drillings in the woofer pole piece.


I always thought that the cross sectioned 'Phase Correction' plugs for the HF units looked so pretty... Very Happy
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terry
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Joined: 22 Apr 2003
Posts: 262
Location: UK

PostPosted: Thu Nov 13, 2008 9:21 pm    Post subject: Link Reply with quote

Thanks for link. Paper certainly should be linked from this site.
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lexi
Junior Contributor 10+


Joined: 09 Nov 2008
Posts: 13

PostPosted: Thu Nov 13, 2008 11:01 pm    Post subject: Reply with quote

Thanks Guys. Interesting design that ...will have to get a listen. I see they are building proper baskets too which not only is better engineering quality but maybe a prerequisite on a unit like that.

Those Tannoy Hornloaded tweeters were expensive and involving to make I think......... changed design slightly now. Are the UniQ any better to the older Kefs ........or just different?
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speakerguru
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Joined: 18 Nov 2005
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Location: Green Hut, Tovil

PostPosted: Fri Nov 14, 2008 11:43 am    Post subject: Reply with quote

lexi wrote:
Are the UniQ any better to the older Kefs ........or just different?

We did a back to back WooferTweeter vs Uni-Q listening test with two pairs of 102/RDM1 sized boxes and it was difficult to tell the difference if you kept your head still in one spot. Both pairs of systems were "flat", measured on the tweeter axis. If you moved around, however, then the Uni-Q changed in timbre less than the conventional 2-way as you moved. The effect will be more noticeable the more acoustically "live" the room.
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lexi
Junior Contributor 10+


Joined: 09 Nov 2008
Posts: 13

PostPosted: Wed Nov 19, 2008 7:52 pm    Post subject: Reply with quote

proffski wrote:
speakerguru wrote:
So the dinosaur has surfaced, eh? Laughing
See http://www.kef.com/France/technology/uniq/qwpintroduction.asp for an explanation of Uni-Q. It's not just dual concentric or co-axial. It's co-incident. Only possible after the development of Neo magnets in the 80s. Before that, the Tannoy tweeters used to have a large magnet so that the tweeter was behind the woofer and all the high frequencies had to go through a collection of drillings in the woofer pole piece.


I always thought that the cross sectioned 'Phase Correction' plugs for the HF units looked so pretty... Very Happy


Mine look pretty as they are all perfectly drilled Laughing
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