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HiFi News 1974 design
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terry
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Joined: 22 Apr 2003
Posts: 262
Location: UK

PostPosted: Fri May 07, 2004 1:28 pm    Post subject: Reply with quote

I dream such dreams too. Some day I may make it a reality. Bass coming from speakers which appear to be furniture with pipes going in all directions hidden from view. Go for it. It sounds a wonderful development project. I assume you know about Dave Dlugos' site.

I also have a couple of contacts in the Netherlands who have been building 'coffins' with B139s. They are referenced on this page.

Terry
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Jonathan B right
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Joined: 22 Jan 2006
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Location: Brisbane Australia

PostPosted: Thu Jan 26, 2006 1:27 am    Post subject: Reply with quote

Dear pjaj, I realise that this post is TWO years late bt I've just found the site. I have a copy of the article you mentioned at the beginning. It was two IBaffles etc. If you post you snail mail address I'll send you a copy. No scanner unfortunately. Jonathan Bright
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proffski
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Joined: 22 Aug 2003
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Location: Tewkesbury UK

PostPosted: Fri May 19, 2006 9:24 pm    Post subject: Reply with quote

terry wrote:
I would be very interested in seeing the article. I remember the HiFi Answers Transmission Line Design which used a B139, B110, T27 and the Coles Super Tweeter. Of course a number of such designs were about at that time.
Terry


Mm, I have so far found copies of the folowing TLs projects and others.

B.J. Webb / Badger Sound Services / Audio Amateur Magazine.
B139, B110, T27, Celestion 2000/STC.

State Of The Art Loudspeaker. Hi-Fi News. April 1976.
B139, B110, HF1300 x 2, T27, STC 4001K.

The ubiquitous Bailey, Wireless World May 1972.
B139, B110, T27. or Radford, BD 25/1, MD 9/2, TD32.

C.J. Rogers. Magazine Unknown & Wilmslow Audio.
B139, B110, T27, ITT-STC 4001G.

Richter - Half Wave TL.
B139, B110, Decca Ribbon Horn.

Interesting article from ETI April 1984 "Bass For Begginers".
Explains principles and calculations superbly, a couple of mistakes.

Loudspeaker Cabinets in Hi-Fi For Pleasure by Stan Curtis.
Excellent!

And a collection from Hi-Fi Answers.
ACE - Bassin. (Subwoofer Design).
About The Size Of It. Proof that a good big 'un is miles better than a good little 'un!

The Missing Octaves. Talk at the AES by Laurie Fincham. 9th Nov 1982.
References to the one with the four B300, two B110, + tweeter... Yep!
Also a prototype Kube?

KEFTOPICS. Newsletter bulletin. Volume3 No1. Re. Reference Series Model 105.

And so far fragments from Hi-Fi Answers March 1981. More Bass.
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ColinR
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PostPosted: Fri May 19, 2006 10:47 pm    Post subject: Reply with quote

Quote:
C.J. Rogers. Magazine Unknown & Wilmslow Audio.
B139, B110, T27, ITT-STC 4001G.


That's the Hi-fi Answers "Rogers R50" where the B110A is kept in a box, however the folds of the B139B labyrinth mirror those of Bert Webb's Cambridge Audio R50.

You need a copy of the B.J. Webb / Badger Sound Services / Audio Amateur Magazine article to get the B110A labyrinth though Shocked .
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proffski
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Joined: 22 Aug 2003
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Location: Tewkesbury UK

PostPosted: Sat May 20, 2006 12:01 am    Post subject: Reply with quote

Ok, thank you for the pointer, there is still a lot of paper to sift through.
I'll look out for that one in particular in order to add it to the rest of the collection if it is there.

Oh, have posted the KEF article regarding the 105 this morning.
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proffski
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Location: Tewkesbury UK

PostPosted: Sat May 20, 2006 1:17 am    Post subject: Reply with quote

No sign of any other TL papers at the moment but unearthed "Loudspeaker Efficiency" by "Everyday Electronics" June 1986.
Apologies for being off topic, but this of course will apply to all speakers.
More excellent reading.

Perhaps might move these to a new thread shortly once the search is over.
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Crazy Frog
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Joined: 02 Aug 2005
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Location: Paris. France.

PostPosted: Wed Jul 12, 2006 1:44 am    Post subject: Reply with quote

ColinR wrote:
Quote:
C.J. Rogers. Magazine Unknown & Wilmslow Audio.
B139, B110, T27, ITT-STC 4001G.


That's the Hi-fi Answers "Rogers R50" where the B110A is kept in a box, however the folds of the B139B labyrinth mirror those of Bert Webb's Cambridge Audio R50.

You need a copy of the B.J. Webb / Badger Sound Services / Audio Amateur Magazine article to get the B110A labyrinth though Shocked .


Good evening Gentlemen.

One of my friend, want to buy a TL speackers.

He is very interesting instead the IMF TLS 80 and the Cambridge R50.

Are they a lot of differences ?

Could you help me, because i never heard the R50 before.

Thank you for yous answers and your help.

Good night. Cool

Bertrand
_________________
I love the old loudspeackers.
I have : KEF Cresta 1970
Kef Cadenza 1974
IMF SC 1976 and 1977
IMF TLS 80 1978.
Quad 303
It's just a debut.
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ColinR
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Joined: 31 Jul 2004
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Location: Staffordshire

PostPosted: Wed Jul 12, 2006 10:17 pm    Post subject: Reply with quote

Mmm a bit hard this one.

IMF TLS80 and RSM have more bass than the Lentek Monitor and are more "polite" soundwise.

All designs use a similar midrange filter section.

The Cambridge R50 has a little less bass than the Lentek Monitor but has a more analytical sound.

So for Bass - IMF TLS80 ~ Lentek Monitor > Cambridge R50.

And Midrange - IMF TLS80 ~ Lentek Monitor ~ Cambridge R50

For Analytical Treble - IMF TLS 80 < Lentek Monitor < Cambridge R50.

The Lentek Monitor uses B139B, B110A, T27 SP1032 & Celestion HF 2000, for those not in the know.
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