"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