Among speaker projects I am thinking about, now that I am reitred, is a
1972 Bailey t-line system. The cabinet seems no big problem; Bailey has
all the necessary measurements in his article. Driver choices and
passive three-way crossover deisgn seem much more difficult. My budget
is not impressive, so I would like to build the crossovers myself, but
I don't know enough to design them. Any recommendations concerning
choice of drivers and crossover design are welcome!

Sven

sbring wrote:
Among speaker projects I am thinking about, now that I am reitred, is a
1972 Bailey t-line system. The cabinet seems no big problem; Bailey has
all the necessary measurements in his article. Driver choices and
passive three-way crossover deisgn seem much more difficult. My budget
is not impressive, so I would like to build the crossovers myself, but
I don't know enough to design them. Any recommendations concerning
choice of drivers and crossover design are welcome!

The Bailey used a B139 if I recall correctly.
I don't have their catalog to hand but Wilmslow Audio list a
modern equivalent (circular, not oval) so the original Bailey
cabinet should be OK. Wilmslow may also do a kit of drivers
and crossovers using this woofer, which will solve your problems.

On the other hand, passive crossovers are rather passé and expensive.
Why not get a Behringer digital gizmo with programmable crossovers
and delays?

--
Eiron

I have no spirit to play with you; your dearth of judgment renders you
tedious - Ben Jonson.

Eiron wrote:

On the other hand, passive crossovers are rather passé and expensive.
Why not get a Behringer digital gizmo with programmable crossovers
and delays?

Doesn't this entail the small matter of a pile of amplifiers, or is there a
Behringer jobbie that goes between amp and speakers?


--
Wally
www.artbywally.com
www.wally.myby.co.uk

"Eiron" wrote in message
...
sbring wrote:
Among speaker projects I am thinking about, now that I am reitred, is a
1972 Bailey t-line system. The cabinet seems no big problem; Bailey has
all the necessary measurements in his article. Driver choices and
passive three-way crossover deisgn seem much more difficult.

The Bailey used a B139 if I recall correctly.

I made two copies of the original Bailey TL somewhere between 1964 and 1967.
The recommended bass driver was the KEF B139, and the tweeter was the
Celestion HF1300. The cross-over was as in the Radford Bookshelf of the
same era which used the same drivers. Commercial versions of the speaker
were on offer a few years later from TDL (if memory serves me correctly).

[Nowadays I get more grunt from a sub-woofer...]
--
M Stewart
Milton Keynes, UK
http://www.megalith.freeserve.co.uk/oddimage.htm

I have pairs of B139, B110 and T27 (though Bailey/IMF was Celestion
1300 to Coles supertweeter) out of a transmission line. If you want
these to build the original design let me know. I'm in W.London
aeatartsandmedia~at~aol~dot~com

Andy Evans wrote:

I have pairs of B139, B110 and T27 (though Bailey/IMF was Celestion
1300 to Coles supertweeter) out of a transmission line. If you want
these to build the original design let me know. I'm in W.London
aeatartsandmedia~at~aol~dot~com

Who hasn't? :-)

I've also got the plans for the C. J. Rogers TL including circuit diagram
of the Cambridge Audio R50 crossover, if anyone is interested.

Many people consider a TL a waste of space and that a bass reflex box is
better.
Though a B139 needs an enormous box, 120litres or so, for a reflex,
so a TL is not so bad for it.

--
Eiron

I have no spirit to play with you; your dearth of judgment renders you
tedious - Ben Jonson.

On Mon, 14 Nov 2005 11:38:50 +0000, Eiron wrote:

Andy Evans wrote:

I have pairs of B139, B110 and T27 (though Bailey/IMF was Celestion
1300 to Coles supertweeter) out of a transmission line. If you want
these to build the original design let me know. I'm in W.London
aeatartsandmedia~at~aol~dot~com

Who hasn't? :-)

I've also got the plans for the C. J. Rogers TL including circuit diagram
of the Cambridge Audio R50 crossover, if anyone is interested.

I have accumulated lots TL and crossover info, along with a pair of
midrange drivers and crossovers from Rogers' Pro9TL, for which I have
no need. Anyone (in the US) interested? The Cambridge R50s are still
in my brother-in-law's system.

Kal

"Malcolm Stewart" wrote in
message ...
"Eiron" wrote in message
...
sbring wrote:
Among speaker projects I am thinking about, now that I am
reitred, is a
1972 Bailey t-line system. The cabinet seems no big problem;
Bailey has
all the necessary measurements in his article. Driver choices
and
passive three-way crossover deisgn seem much more difficult.

The Bailey used a B139 if I recall correctly.

I made two copies of the original Bailey TL somewhere between 1964
and 1967.
The recommended bass driver was the KEF B139, and the tweeter was
the
Celestion HF1300. The cross-over was as in the Radford Bookshelf of
the
same era which used the same drivers. Commercial versions of the
speaker
were on offer a few years later from TDL (if memory serves me
correctly).

[Nowadays I get more grunt from a sub-woofer...]
--

Many would say a 'senior' moment, but actually a 'craft' moment -
'can't remember a f'ing thing!'

The original design by Arthur Bailey was, IMSMC, published in Wireless
World in about 1971 and was later included part of a collection of
hi-fi designs republished by Wireless World in the late 70's or early
80's of which I still have a copy.

The design was originally (I think) for B139/B110/T15, but they
stopped making the T15 soon after and the T27 was substituted.
Wilmslow supplied an addition of a Coles 4001 super tweeter which
many, including myself, added to good effect.

The commercial units were the TLS50 and TLS80 produced by IMF, of
which you still some being sold at silly prices to this day.

The TDL's used what they called a 'reflex transmission line' which was
really only a fractional wavelength but quite effective. The B&W DM2
(or was it DM4?) used a similar design to good effect - and that did
use the HF1300 and Coles 4001.

In my experience the only other speaker that could manage the
subtleties of deep base - albeit rather quietly - was the Lowther
Acoustic Labyrinth, but as they say that's a different can of worms
altogether!


--
Woody

harrogate2 at ntlworld dot com

"Eiron" wrote in message
...
sbring wrote:
Among speaker projects I am thinking about, now that I am reitred, is a
1972 Bailey t-line system. The cabinet seems no big problem; Bailey has
all the necessary measurements in his article. Driver choices and
passive three-way crossover deisgn seem much more difficult. My budget
is not impressive, so I would like to build the crossovers myself, but
I don't know enough to design them. Any recommendations concerning
choice of drivers and crossover design are welcome!

The Bailey used a B139 if I recall correctly.
I don't have their catalog to hand but Wilmslow Audio list a
modern equivalent (circular, not oval) so the original Bailey
cabinet should be OK. Wilmslow may also do a kit of drivers
and crossovers using this woofer, which will solve your problems.


The "superb alternative" to a B139 offered by Wilmslow is the Volt B250.8



On the other hand, passive crossovers are rather passé and expensive.
Why not get a Behringer digital gizmo with programmable crossovers
and delays?


Or try summat with *no* crossover and hear *all* the
notes/instruments/words/voices for a change?

Eiron wrote:
Why not get a Behringer digital gizmo with programmable crossovers
and delays?

Eiron

What's that?

Sven