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Why did KEF mount the B300 on rubber in the 105.2?

 
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adam_audio
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Joined: 07 Jul 2005
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Location: Land Of The Lost

PostPosted: Thu Sep 14, 2006 8:32 pm    Post subject: Why did KEF mount the B300 on rubber in the 105.2? Reply with quote

It seems to me that KEF was cutting corners on the 105.2 loudspeaker with regard to the cabinet design. I am guessing the B300 was mounted on those rubber bushings so that KEF didn't have to spend money on improving the bass cabinet....but I'm not sure. Is there any other reason why KEF chose to mount the woofer the way that they did?
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ColinR
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Joined: 31 Jul 2004
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Location: Staffordshire

PostPosted: Thu Sep 14, 2006 9:44 pm    Post subject: Reply with quote

The rather expensive mounts in the Ref 105-2 were designed to decouple the bass unit's vibrations from the cabinet, reducing potential driver intermodulation and cabinet resonances.

The rubber "O" rings with their associated small metal bushings achieve the same effect with the B110B in bass and midrange applications, they can also be found on designs with the B200G unit.


Mission and ATC use this type of technology.
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ojdorson
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Joined: 05 Oct 2006
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PostPosted: Fri Jan 05, 2007 10:10 pm    Post subject: speaking of the o-rings on the b110... Reply with quote

the ones on my b110s are quite compressed. I'd like to replace them with fresh, rubbery ones. Is this a good idea? Should I just find ones the same size?
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proffski
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Joined: 22 Aug 2003
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Location: Tewkesbury UK

PostPosted: Sun Jan 07, 2007 4:56 pm    Post subject: B110 Gaskets and O ring decoupling. Reply with quote

Without boring you with physics I'd say that the material and level of compression would be very important to achieve the designer’s goal.

If you had access to laser inferometry and or accelerometers then you could tune the mountings for best results.
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ojdorson
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PostPosted: Sun Jan 07, 2007 5:29 pm    Post subject: Reply with quote

So, in english, that means "just leave them alone"??
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proffski
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PostPosted: Mon Jan 08, 2007 9:09 am    Post subject: Reply with quote

Very Happy Enjoy! Smile
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