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Old 6th May 2011, 09:27 PM   #1
M Gregg is offline M Gregg  United Kingdom
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Default LS3/5a

Just a question,

I have never heard (listened) or seen a set of BBC LS3/5a speakers.
(only in magazines etc)

has anyone any thoughts on this design?

Just for interest!

Regards
M. Gregg
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Old 6th May 2011, 09:55 PM   #2
SY is offline SY  United States
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About 35 years worth of thoughts, and two rounds of ownership. What do you have in mind?
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Old 6th May 2011, 10:11 PM   #3
M Gregg is offline M Gregg  United Kingdom
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Quote:
Originally Posted by SY View Post
About 35 years worth of thoughts, and two rounds of ownership. What do you have in mind?
Hi SY,

These are just thoughts.

I came across them while reading some info on a web site.
I was wondering if the sound was as good as people claimed?

Some people still seem to think they are hard to beat.

I am just looking at the spec for them, the drivers seem to be either hard to find or megga expensive.

Do you think that the modern designs make them obsolete?

Is it possible to build a modern version of this design?

Regards
M. Gregg
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Old 6th May 2011, 10:15 PM   #4
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Arpeggio Loudspeaker

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Old 6th May 2011, 10:16 PM   #5
chrisb is online now chrisb  Canada
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Quote:
Originally Posted by M Gregg View Post
Hi SY,

These are just thoughts.

I came across them while reading some info on a web site.
I was wondering if the sound was as good as people claimed?

Some people still seem to think they are hard to beat.

I am just looking at the spec for them, the drivers seem to be either hard to find or megga expensive.

Do you think that the modern designs make them obsolete?

Is it possible to build a modern version of this design?

Regards
M. Gregg

with regards to the last question, there are at least a couple of current homages to the namesake

Audiospace AS3/5A

Grant Fidelity LS3/5A

and probably others engineered/marketed as "good as or better than" , etc.,


keep in mind that IINM, there were rather a few variations on the official design, plus numerous wannabes over the course of 4 decades


I've very briefly heard both an official Rogers pair approx 25-30(?) yrs ago, and more recently one of the Chinese knock-offs possibly similar to the Grant Fidelity, but for different reasons neither exposure was memorable one way or the other.
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Last edited by chrisb; 6th May 2011 at 10:25 PM.
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Old 6th May 2011, 10:30 PM   #6
chrisb is online now chrisb  Canada
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Originally Posted by wakibaki View Post

a very fun looking and doubtless fine sounding project, but quite simply not in the same category as a low sensitivity 2-way mini-monitor


edit ; sorry Waki, I realize you were probably replying to
Quote:
Do you think that the modern designs make them obsolete?


"obsolete" would perhaps not be the most diplomatic term, but no doubt many in a DIY forum would have suggestions as to what to build for far less money
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Last edited by chrisb; 6th May 2011 at 10:34 PM.
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Old 6th May 2011, 10:43 PM   #7
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Not sure what you're after. As pointed out there are sites devoted to this speaker..............and one that just takes it apart quite critically, the guy slams it!
Only recently here (Australia) a rebuilt secondhand one sold for around $800 (US) on eBay.

One of the limiting factors was the size requirement. The BBC demanded that it had to be small. If I ever got a pair I think I might experiment with a larger box. Secondly I would play around with the mounting of the woofer. It fix from behind the baffle. I don't know why. The only suggestion I have is that the B110 basket does not have very wide openings. When measured they are around 50% of the cone area. So any further obstruction may have effected the "colouration". But a thin steel baffle could provide the best of both worlds and allow from mounting and no rear restrictions. Then you could look at the T27 cross over. The KEF 104ab network is on the web and that might be worth a look.

Anyway, what prompted your initial post? Seen a pair s/hand?

EDIT. DOH! Sorry, just went back and read your other post. There is a good site that will take you through a diy cloning operation with diagrams of the box etc.. I have just acquired a pair of KEF Concertos and with an earlier pair of B110 I have I will be looking at a clone or copy.
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Last edited by Jonathan Bright; 6th May 2011 at 10:49 PM.
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Old 6th May 2011, 10:52 PM   #8
SY is offline SY  United States
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I owned original Rogers and later, Chartwell. They are a mix of strengths and weaknesses. Superb rendition of space and midrange/treble tonality, good impression of detail. They do not play loud. No deep bass, and the rather highish Q of the LF cutoff makes them a challenge to subwoof effectively. Not terribly efficient and poor power handling. Impedance curve is all over the place, which means care must be used in selecting a power amp. Mine were usually run from some 40 watt triode amps I had at the time.

Morgan Jones uses his to listen to Pink Floyd and Beethoven symphonies. Those would not be my first choices of music for these speakers! When I got my first pair, I was deep into small combo jazz and acoustic bluegrass (I guess I still am!), and they did a great job in those genres. They're brilliant on string quartets, and I was blown away by how well they reproduced the Chicago Symphony Winds (Sheffield Lab 22).
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Old 6th May 2011, 11:06 PM   #9
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Sorry, that was a bit terse. The reply was prompted by Morgan Jones' comment that the Arpeggios have supplanted his own LS3/5As. He is admittedly the designer of the Arpeggios, but he was also a BBC engineer, listens to them in preference, and employs them in similar circumstances to those in which he used the LS3s. I don't think the improved sensitivity would be considered as a disadvantage.

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Old 7th May 2011, 12:30 AM   #10
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I sold many an LS3/5A. It was a love/hate relationship.

I just recently restored a pair. My feeling is that the classic speaker market has pushed the price up well above what their sonics would dictate.

A set of Alpair 7 in a similar size box, IMO, outperforms them.

dave
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