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T-Line with B200
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Wouter
Intermediate Contributor 50+


Joined: 18 Jun 2004
Posts: 60
Location: Ramsel (Belgium)

PostPosted: Fri Jun 18, 2004 10:33 pm    Post subject: T-Line with B200 Reply with quote

Hello,

I have a B200 SP1063 and T27 SP1032. My intention is to build T-lines with them. Does anyone has tips, interesting links, schematics, ... for me?
For the B139, you can find a bunge of information, but not so for the B200... Unfortunately. Sad

Thanks in advance for any reply!


Best regards,
Wouter
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terry
Senior Contributor 200+


Joined: 22 Apr 2003
Posts: 262
Location: UK

PostPosted: Sat Jun 19, 2004 3:06 pm    Post subject: Reply with quote

Wouter
Yes not much around for B200 in that regard. Try Colin Royle - he may have heard of some. You will find his email address on the main website.
Terry
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Wouter
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Joined: 18 Jun 2004
Posts: 60
Location: Ramsel (Belgium)

PostPosted: Sun Jun 20, 2004 5:50 pm    Post subject: T-Line with B200 Reply with quote

Terry,

Colin advised me to check the Daline or Radford S90 (with the necessary corrections for the smaller woofer).
I saw some pictures on your site of Bob Thomson, but I can't reach him via e-mail. I receive an error message everytime I try to send my e-mail. I used the e-mail address as mentioned on you site. Any idea if this has changed recently?

Wouter
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terry
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Joined: 22 Apr 2003
Posts: 262
Location: UK

PostPosted: Mon Jun 21, 2004 12:37 pm    Post subject: Reply with quote

Wouter

Yes I did think about the Dalines but then discounted them as all parameters are based on the B110s.

Regarding Bob Thompson - unfortunately I have no other contact details.

Terry
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Wouter
Intermediate Contributor 50+


Joined: 18 Jun 2004
Posts: 60
Location: Ramsel (Belgium)

PostPosted: Wed Jun 23, 2004 9:59 am    Post subject: T-line with B200 Reply with quote

Yes, I have read the information about the Daline in the meantime.
Changes are made to the B200 as well, but when I go for the Radford I also have to do modifications to the cabinet for the B200.
Anyway, if it's hard to find a good TL design for this speaker, I will go for a closed baffle with sandwich construction to eliminate resonance to the outside of the baffle. But then again, I fear standing waves in the enclosure...
Anyone experience with sandwich constructions?

Terry, I also like the Triangel construction on your site, but this one is not easy to make. This one is very good to avoid these standing waves...


Regards,
Wouter
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proffski
Über Contributor 1000+


Joined: 22 Aug 2003
Posts: 1296
Location: Tewkesbury UK

PostPosted: Sat Sep 03, 2005 8:48 pm    Post subject: Re: T-line with B200 Reply with quote

A friend did build the original Dalines, with the Coles unit EHF.
I was never too wowed by them, perhaps now it would be different.
Sorry, still no pictures, they will come...
One of my past projects was a unit based on the LS35a but much deeper keeping the volume to slightly above that of the original.
It was a composite of concrete loaded flooring grade chipboard with layers of bitumen pads and roofing lead. The B110 was the later version, the rest was as per design on one of the LS35a series.
Now still in use in Gloucester, they were covered in white formica.

Oh, in the Hi Fi World magazine (Octoer issue no.85) on pages 91 and up there is a TL design for the B110 or similar.
Plenty of scope for tweaking and experimenting with the loading.
It is eight wave rather than the traditional quarter, I see no reason as to why it couldnot be used with upscaling with a B200.
The sealed enclosure properly designed is still my favourite however.
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Wouter
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Joined: 18 Jun 2004
Posts: 60
Location: Ramsel (Belgium)

PostPosted: Sun Sep 04, 2005 9:34 pm    Post subject: Reply with quote

Hi Andy,

Thanks for the information!
In the meantime, I have build a pair of closed Concerto's: see the site on page "Personal treasures".
I am keeping a TL for the future (first building up experience and knowledge...)


Regards,
Wouter
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proffski
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Joined: 22 Aug 2003
Posts: 1296
Location: Tewkesbury UK

PostPosted: Sun Sep 04, 2005 9:54 pm    Post subject: Reply with quote

Good luck on your voyage of discovery!
Please keep us all informed on the progres.
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harry h
Junior Contributor 20+


Joined: 15 Oct 2004
Posts: 24
Location: Kapiti coast. New Zealand

PostPosted: Tue Sep 06, 2005 11:22 am    Post subject: Reply with quote

Wouter, if you can lay your hands on a copy of Vance Dickason's "Loudspeaker design cookbook" sixth edition, you will find all your answers on page 96,as he actually use a Keff B200 as an example to calculate line length,area and total volume plus stuffing density.
I wish he had used a B139,it would have saved me a lot of worry as I was building mine. Laughing

ps dont give up on the idea, T lines, if done right have a sound that can't be matched.

cheers

harry.
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proffski
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Joined: 22 Aug 2003
Posts: 1296
Location: Tewkesbury UK

PostPosted: Tue Sep 06, 2005 7:46 pm    Post subject: Reply with quote

The IMF TLS50 used an 8" / 200mm woofer.
I cannot remember as to whose it was.

It was a big loudspeaker!
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proffski
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Joined: 22 Aug 2003
Posts: 1296
Location: Tewkesbury UK

PostPosted: Tue Sep 06, 2005 8:02 pm    Post subject: Reply with quote

I'd like to think that it was a KEF B200.
Memory is hazy, the photographs on Google vary, also there is mention of a foam surround on the woofer.

I do not remember B200s ever having had foam surrounds.
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Wouter
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Joined: 18 Jun 2004
Posts: 60
Location: Ramsel (Belgium)

PostPosted: Tue Sep 06, 2005 9:07 pm    Post subject: Reply with quote

As far as I remember well, it was the SP1063.

Regards,
Wouter

PS. My brother has an IMF RSPM4 (with B139-B110-HF1300-HF2000).
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proffski
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Joined: 22 Aug 2003
Posts: 1296
Location: Tewkesbury UK

PostPosted: Tue Sep 06, 2005 9:12 pm    Post subject: Reply with quote

Ah, thank you for the information.

Your brothers loudspeaker is a worthy momento to the TL design.

Best regards from Gloucestershire UK!
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joppe
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Joined: 05 Feb 2006
Posts: 1

PostPosted: Sun Feb 05, 2006 7:46 pm    Post subject: Reply with quote

i have an tl designed speaker playing over here that uses B200 sp1014's they sound awsome freq response from 28 hz Smile its constructed like this one

ah 2 folded horn
http://www.t-linespeakers.org/design/foldings/tttl.html
but i as well cant find the exact design for it , and i dont like stripping my own speakers to recreate the design. i think we have to google some more Smile
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DrBoar
Junior Contributor 20+


Joined: 22 Aug 2006
Posts: 21

PostPosted: Sun May 27, 2007 3:53 pm    Post subject: Reply with quote

There is a TLS for the B200 in HIFi News back in June 1972. It looks very much like the IMF 50. But it used B200 T27 and the DN9 crossover, send me message with an email adress and I can send you scanned copies.
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