Any currently produced drivers for LS3/5A? - Page 4 - diyAudio
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Old 6th February 2012, 07:48 PM   #31
DrBoar is offline DrBoar  Sweden
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The LS3/5A was built for a specific purpose, monitoring of mostly vocal material and to be used in a small often mobile studio. It had floppy walls and a huge hump below 200 Hz and only someone like Ken Kessler would use it to evaluate the bass ability of Krell amps on

It had for its time a very nice midrange and that was what BBC needed in this application. The backmounted mid-driver and all the problem that this means is outdated. Nobody used bextrene drivers anymore and that is for a reason.

I have some KEF T27 tweeters and if I would find some B110 at flea market price I could try making LS3/5A as a hobby project. As I remember both the B&W DM12 and the KEF 101 sounded better at the time. And 30 years later current design from KEF, B&W, Dali and other sound much better so I really fail to see the point of spending a lot of money to just get LS3/5A sound???

I have "recreated" vintage designs as a fun project, but I have no illusion that this will give me the best sound for the invested time and money, but that is hardly the point of a hobby if it is DIY audio or fly fishing
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Old 6th February 2012, 10:19 PM   #32
sreten is offline sreten  United Kingdom
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Quote:
Originally Posted by DrBoar View Post

..... and only someone like Ken Kessler .....
Hi,

One of the worst things that has happened to the british hifi press.
Pander to the gullible, never make any real sense, BS and be a snob.

Sadly, apparently, it works and he is "popular" with casual readers.

rgds, sreten,
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Old 6th February 2012, 10:38 PM   #33
Hazuki is offline Hazuki  United States
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In response to the original questions, I would recommend contacting Stirling Broadcast, whose contact info is given at their website.

I emailed them myself and received a very quick, complete, and courteous response from Mr. Stirling:

"[...]KIT 1:
Matched pair of Monacor drive units with custom neoprene gaskets and latest Stirling crossovers (for use with customers T27's).
£ £ 128.00

KIT 2:
Matched pair of Monacor drive units, Scanspeak tweeters, latest Stirling crossovers and a pair of baffles. Also included: Tweeter mesh grilles, all nuts/bolts/spacers, self adhesive felt squares, our custom neoprene gaskets for all four drive units
£ 268.00

KIT 3:
A pair of fully built & tested "complete matched pair baffle assemblies" (Monacor/Scanspeak/Stirling crossovers), ready to fit into the customers cabinets. These baffle assemblies will fit ALL LS3/5a cabinets from 1974 through to 2011. Top quality UK produced CNC machined birch ply baffles with velcro and tweeter felts fitted, mesh grilles fitted to the tweeters - just connect the flying leads on the crossovers to the rear connectors in your cabinets and screw the baffles down (self adhesive sealing tape included).
£ 328.00

KIT 4:
As per KIT 3, PLUS a pair of cabinets with glued-in rear panels, thin-wall 9mm ply construction...therefore "hybrid" reference cabs - (as used for Rogers 60th Anniversary model).
£ 488.00 to £ 518.00 depending on chosen veneer (Black Ash, Walnut, Cherry, Rosewood or Ebony).

Stirling MS-88 Loudspeakers
As KIT 4, but these are a pair of fully built and tested loudspeakers, fitted with bi-wire gold plated connectors, tygan grilles. Sold with TWO year warranty.
£ 568.00 to £ 598.00 depending on chosen veneer (Black Ash, Walnut, Cherry, Rosewood or Ebony)...."

Stirling manufactured the Rogers' 60th Anniversary LS3/5as, and they (Stirling) tell me that the MS-88 is exactly the same.

For what it's worth, I, myself, am planning on purchasing the Kit 4 -- assuming that they are exactly the same as the MS-88, down to the Tygan. I have a pair of very nice sounding Chinese LS3/5a variants, but, as an ex-Rogers owner, would like an official pair.

The info I received is the same as what was already cited at a certain Thai audio website.
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Old 7th February 2012, 10:09 PM   #34
sreten is offline sreten  United Kingdom
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Hi,

I can't see anything "official" about those kits SB sell on e-bay.

Their V2 version may be "officially" licensed (Seas bass unit) but
I don't think that the above are, unless i'm missing something.

rgds, sreten.
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Old 7th February 2012, 11:28 PM   #35
system7 is offline system7  United Kingdom
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Does anyone seriously think the LS3/5A had some sort of magic sauce poured on it? I really don't need a BBC license to get a speaker in their tradition. We know what the ingredients were. We've discussed most of the important design features. But might as well use modern components.

For my part, I prefer a little bigger box since I don't live in a rabbit hutch!
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Old 8th February 2012, 12:26 AM   #36
Hazuki is offline Hazuki  United States
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Quote:
Originally Posted by sreten View Post
Hi,

I can't see anything "official" about those kits SB sell on e-bay.

Their V2 version may be "officially" licensed (Seas bass unit) but
I don't think that the above are, unless i'm missing something.

rgds, sreten.
Yes, you are quite correct, of course.

The Stirling kits appeal to me as a less pricey way of replacing my old Rogers (purchased new at cost in 1984) with a new pair of speakers.

So, if, as I was told, the MS-88 is "exactly" the same as the Rogers 60th Anniversary, which bears BBC certification -- and which was much praised by Martin Colloms, as well -- then that is close enough for my personal listening purposes.

Again, Stirling's Kit 4 is presented as the same as the MS-88 but not fully assembled and "tested". In my view, that is rather analogous to the kit versions of the "official" speaker which I believe the BBC made available to their employees.

Just by way of explanation of my own circuitous logic....
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Old 8th February 2012, 02:38 PM   #37
system7 is offline system7  United Kingdom
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Interestingly, Harbeth make a speaker that the BBC themselves buy from them, being an update of the original, It uses an improved cone and tweeter, but much the same neutrality and tight tolerances and a studio monitopr pedigree.

Enter the Harbeth Monitor 20 at an eyewatering £1200:
Harbeth UK

FWIW, the splendid Monitor 40 is about £6500.
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Old 13th February 2012, 02:40 AM   #38
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Rocelco had them a few years ago.

Since so many people are looking for replacements I sent them an e mail just to see if they were still available and they did not reply.

For the price better drivers can be purchased unless replacements are necessary for the Ls3/5a and Kef Constructor Kits.

Rogers LS3/5a Woofers & Tweeters
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Old 14th February 2012, 01:55 AM   #39
Mr. dB is offline Mr. dB  United States
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Quote:
Originally Posted by Hazuki View Post
KIT 2:
Matched pair of Monacor drive units, Scanspeak tweeters, latest Stirling crossovers and a pair of baffles. Also included: Tweeter mesh grilles, all nuts/bolts/spacers, self adhesive felt squares, our custom neoprene gaskets for all four drive units
£ 268.00

Oddly, the Monacor woofer appears to be a dual voice coil unit.
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Old 15th February 2012, 08:25 AM   #40
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Originally Posted by system7 View Post
The BBC LS3/5A was carefully equalised in the crossover for what is, by modern standards, a quirky heavy 5" KEF bextrene unit and a mylar domed T27 tweeter. I'd say the art has moved on a lot.

Tweeters like the Vifa XT19TD00-04 soft dome are just SO much better. You have a huge choice of 5" units these days too. Kevlar or paper might be nice. Naturally cabinet size is dictated by woofer characteristics, but if you then apply baffle step correction and tweeter impedance equalisation, you should get something very BBC, as discussed here:
Classic monitor designs?

Baffle step calculation: Loudspeaker Diffraction Loss and Baffle Step Compensation Circuits
Impedance correction: Impedance Equalization (L-Pad) Circuit Designer / Calculator

One must move with the times!
I don't agree. The mylar domed T27 tweeter has several disadvantages (only high crossover frequency above 3K and very low efficiency) but the sonic quality is very hard to beat if one not listening with high sound pressure levels.
And even the KEF bextrene unit has several drawbacks, mainly the fact, that additional to the typical crossover network passive equalizer networks are necessary (then also low efficiency). Nevertheless outweigh the benefits, especially the low fres and the low temperature dependence so as low loss of the rubber surround (obviously very good recipe for the mixture).

I still have not found modern, currently available drivers with comparable rubber surrounds in this size (I know only few drivers with foam surrounds with similar behaviour).

OTOH - there are several vintage versions of the LS-3/5A and I know not all versions listed by post #63 about the German forum
LS3/5a in allen ihren Formen - Verstärker, Lautsprecher, Zubehör - Analog-Forum

But I know definitely, that the later versions, equipped with SEAS parts (Harwood/Harbeth P3ESR e. g.) no longer have quite the precision in sound from the old models. I guess, mainly cause ferrofluid inside of the tweeter and cause the low Qms values of the SEAS bass-mid transducers.
http://www.soundbysinger.com/UserFil...SR%20close.jpg

I want also to know any currently produced drivers like the KEF B110A SP1057 about
http://homepage.mac.com/planet10/TLS...110_SP1057.gif
with free air resonence below 40 Hz by this size - addidional high quality mylar tweeters without ferofluid.

Thank you for your advices

Last edited by tiefbassuebertr; 15th February 2012 at 08:30 AM.
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