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Multi-Way Conventional loudspeakers with crossovers

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Old 18th November 2015, 09:46 PM   #1
bigi is offline bigi  United Kingdom
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Default Help with Centre Speaker

Hi all

Just got hold of a B&W LCR60 S3 centre speaker to match my front 602 S3s; had a wrecked tweeter diaphragm but all good apart form that. However, I've noticed the right hand driver seems to be quieter than the left one! I've swapped the drivers round to make sure there isn't a failing driver, and it sounds exactly the same. Does anyone know where i can get a crossover Schematic for one of these, or a way to test for the fault on the crossover unit? I've had a look and can't see any signs of damage, but obviously being passive components I doubt it will be obvious! I don't want to have to return it and will happily buy parts if need be....but need to know how to identify it first - or if in fact one driver is meant to have a different response range than the other!

Thanks all!
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Old 19th November 2015, 12:12 AM   #2
bigi is offline bigi  United Kingdom
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just to update this - i've managed to get together a diagram of the crossover - it's listed as HF/ULF/LLF crossover board - so maybe i've never tonoticed that one is for LF and one for midrange before?!

Anyway - see attached. any help appreciated!
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File Type: jpg crossover.jpg (853.5 KB, 27 views)
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Old 19th November 2015, 12:25 AM   #3
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They are different as you can see in the circuit diagram ULF vs. LLF circuits for the LF. Link to the LCR60 S3-TM.pdf from B&W North America.
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Old 19th November 2015, 12:28 AM   #4
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What's the second question?
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Old 19th November 2015, 12:57 AM   #5
bigi is offline bigi  United Kingdom
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Thanks you my friend - i was looking for the service manual with schematics of the crossover though

So from the crossover diagram you would expect the output from one driver to be different from the other? (I'm not too up with my L-R-C logic i'm afraid!)
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Old 19th November 2015, 01:05 AM   #6
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yep, the driver connected to L3 is bass only, the other Bass & mids - a 2.5 way system
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Impedance varies with frequency, use impedance plots of your drivers and make crossover calculations using the actual impedance of the driver at the crossover frequency
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Old 19th November 2015, 01:25 AM   #7
system7 is offline system7  United Kingdom
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Service manual is here: B&W Group North America Service & Support - Home

Might be nothing wrong there. One bass is filtered differently from the other. A 2.5 way, as has been said.

Below are B&W engineering drawings. Good luck.
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File Type: jpg B&W LCR60 S3 Crossover.JPG (40.1 KB, 21 views)
File Type: jpg B&W LCR60 S3.JPG (59.1 KB, 21 views)
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