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Old 19th June 2012, 04:19 PM   #21
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Quote:
Originally Posted by irext View Post
The B110 came in two versions. The SP1003 and the SP1057 (I think). They had slightly different characteristics and LS3/5a's using them had crossover variations to suit. Original BBC LS3/5a's were apparently individually adjusted to compensate for driver variations. It would seem that consistency between batches was a problem back then.
Was SP1057 ever used in LS3/5A?

dave
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Old 19th June 2012, 10:47 PM   #22
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Quote:
Originally Posted by planet10 View Post
Was SP1057 ever used in LS3/5A?

dave
I know the SP1057 was used in many Kef models like the 105 and 101. It was the SP1228 used in later Ls3/5a models around 1987.
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Old 24th June 2012, 10:53 AM   #23
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Hi everyone.
Just an update. re:- the Kef units.
I've prepared them ready for the install in new cabinets. Carefully cleaned up the units individually.
They are in a really good condition.
Another question please ?
Is there a specific are on this brilliant site that i can ask about my Garrard 401 ?
It makes a very quiet hum from the motor running ? - nothing annoying when music is playing, but nevertheless, I dont think its right ?
I havent maintained / serviced it yet ( this too was kindly donated to me ) . It sits in an 18mm plinth, and is perched on my Technics tower unit, that I have temporarily removed the glass lid from.
Garrard 401 experts, please help
Thanks and kind regards
adrian
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Old 24th June 2012, 11:22 AM   #24
AndrewT is offline AndrewT  Scotland
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Old 24th June 2012, 03:56 PM   #25
system7 is offline system7  United Kingdom
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Always pleased to hear about an enthusiast fixing up an old classic. There's terrific web support for the older KEF models, so you won't go far wrong.

With that Garrard 401, you have quite an impressively great retro system in the making. It's a great and beautiful and collectable turntable with spare parts available. The round rubber idler wheel connecting the motor to the rim is known to produce more bass rumble than a belt drive. But its part of the design, and you just live with it.

Enthusiasts generally use a very heavy wooden plinth and some serious acoustic isolation like webbing straps on a most solid shelf well away from the speakers.
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Well, there it is! Best regards from Steve in Portsmouth, UK.
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Old 25th June 2012, 05:01 AM   #26
irext is offline irext  Australia
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Originally Posted by planet10 View Post
Was SP1057 ever used in LS3/5A?

dave
Sorry, my mistake. It was the SP1228 (B110C) in the LS3/5a's of later years, and it did have somewhat different characteristics. I was originally thinking of the CS1 and CS1a (constructor series) which also used the T27 and B110 combo. I have a pair of LS3/5a clones using SP1003 drivers. While I do quite like their sound they are a bit harsh at times and they really are a near field monitor. They tend to become a bit shouty if pushed beyond their limit.
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Old 25th June 2012, 02:43 PM   #27
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Thankyou for the replies, after doing much research, and this forum, I'm considering housing the speakers in enclosed , tight boxes, ( not xmission line ) and use plenty of Baff wadding, or whatever the equivalent is. - going for relatively tall slim , rather than the dimension of the boxes they came out of. - so the B139, will be vertical as it were, then B110 above, then T27 at top. That should do it. Some KEF data sheets have given me volumes required for the bass and the mid units, so i'll isolate each chamber, and dampen them well, this will also help in strengthening the cabs too . -
The Garrard 401, - weighs a ton , but i will have a peek at it sometime. Like you said steve, its the design, I think when i looked yesterday, the noise is off the actual motor, with the platter removed , and carefully disengaging the idler, there was no difference, so the noise is transmitting from motor , through the body of turntable, into plinth. - my towe unit doesnt help, its acting like a sound chamber a bit .... - its there very temporarily, to prove it works, but safe so it wont slide off it ...
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Old 25th June 2012, 03:48 PM   #28
system7 is offline system7  United Kingdom
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There is a slight pitfall do consider when you make a cabinet narrower where the speaker is away from the wall. It changes the bafflestep point. This is where the driver is half a wavelength to the edge of the cabinet, at which point you transition from 4Pi space to 2Pi space. Oh look, I can't explain it simply here beyond saying that when you pull a speaker away from the wall, the bass falls 6dB up to the bafflestep point.

Loudspeaker Diffraction Loss and Baffle Step Compensation Circuits

Bottom line is narrower cabinets need a bigger bass coil and you then attenuate the midrange and tweeter to compensate. My own preference is to sidestep the issue entirely and build bookshelf style flush with the wall.

The Garrard 401 is quite familiar to me. People used to build them into cabinets or make their own plinth from a lump of wood. SME made a goodish suspended plinth, but the best I ever saw was suspended on furniture webbing within a simple box frame so it rocked gently backwards and forwards while tracking securely. The flimsy SME 3009 9" tonearm wasn't really all that good in hindsight, and people fitted heavier ones with the more demanding moving coil cartridges.
Attached Images
File Type: jpg Garrard_401_SME_Plinth.JPG (55.8 KB, 162 views)
File Type: png Floating_plinth_Garrard_401_SME_webbing.png (11.6 KB, 160 views)
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Well, there it is! Best regards from Steve in Portsmouth, UK.

Last edited by system7; 25th June 2012 at 03:51 PM.
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Old 25th June 2012, 04:12 PM   #29
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Steve ,
I'll seriously look into that and thanks for the link re :- diffraction loss etc.
looking forward to researching, to get it right.
I'm up to speed with dB's , its my job ( in communications ) and I have a very very small electronics construction business . anyway , cant wait to get the old log tables out ( nah, scientific calculator. )
Just been looking at some Slate plinths for the 401 - ( well ... I can dream can't i )-
re the narrow cab, -- still would have depth behind the woofer, but just making them leaner ?? that was all
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Old 27th November 2012, 06:02 PM   #30
wr1944 is offline wr1944  United States
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Recently I moved from Holland to the USA. With me I took the drivers and filters of the KEF Concertos. The home-made casing was too bulky so I stripped it. So I have more or less the same question as the original poster.
I want to rebuild the system but with a smaller cabinet. I like to make a smaller (less wider) cabinet in a closed form. I don't mind to lose some of the low frequencies. Is a box of about 300 mm wide reasonable?
The original box was about 70 to 75 liter with a port. What could be the size of a fully closed cabinet?
In Holland I knew my way for damping material and electronic components. Which companies are delivering the stuff?
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