SpeakerTalk

frank · Junior Contributor 10+ Joined: 24 Nov 2004 Posts: 13

I've been thinking about rebuilding a large Kefkit 3 that is about 30 years old ago to give to my sister.

I've been looking at the 1972 article by Bailey, the second one:
"The Transmission-line Loudspeaker Enclosure - a Re-examination...and a suggested new method of construction". But the measurements seem to be wrong for the internal baffles 18" and 12" respectively.

I laid out the design on an old piece of MDF from the diagram Fig 6 and Fig 7. in the article which is on this site.
If an 18" line is laid out from midway in the top left-hand corner and taken down until it is 11" in from the bottom left hand corner the 18" diagonal measures ok and it fits.
But if you then take a line for the second divider which is supposed to be 12" and take it from the top right hand corner to meet the 18" diagonal at 7" along the diagonal it is not long enough to meet.

Seems to me it needs to be approx 14". But thats if it goes from the middle of the top right corner to form a right angle with the 18" divider.
If its angled differently to form a different sized internal compartment then it can be done with the 12" but it seems more likely to be a mis-print. The problem is if its a misprint which detail is misprinted. My guess would be the 12" should be approx 14".

Has anyone actually built one ?

It might not be worth the time and trouble to re-build but I guess thats another question.

ColinR · Posted: Wed Oct 24, 2007 10:22 am Post subject:

I agree the 1972 plans are a "bit off" as I have a pair built from a set of parts cut by the original Wilmslow Audio team.

Email me directly and I'll supply you with a photograph of one of mine with the bottom off and you can work out the dimensions and positions of the internal dividers yourself.

"What's off" in Fig 6 of the middle page is the shorter divider is shown running to a corner, it doesn't, but it is located at a right angle 7" from the position shown Cool

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suffolk2 · Posted: Mon Oct 29, 2007 10:42 pm Post subject:

i had a pair of bailey but sold it.

i still miss it for the extra omph at the bottom range,
compared to my calindas.

should be worth builing one again Wink

frank · Junior Contributor 10+ Joined: 24 Nov 2004 Posts: 13

I'm glad to hear someone say its worth it - I hope my sister appreciates it! Laughing

suffolk2 · Posted: Sun Nov 18, 2007 9:28 pm Post subject:

women dont appreciate anything if u ask me Very Happy

the baileys are very rare now, but they still sound impressive.

it makes the music come alive, thats the only way i can describe it Cool

frank · Junior Contributor 10+ Joined: 24 Nov 2004 Posts: 13

Well, her first comment was:

"More stuff !" Rolling Eyes

By the way I'm not so sure the measurements are as much out as I thought; it depends on the thickness of the cabinets. I hope Dr Bailey is not turning in his grave too much.