X-over freq in DM40? - diyAudio
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Old 15th September 2004, 04:10 PM   #1
27ph is offline 27ph  Denmark
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Default X-over freq in DM40?

Hi there

I plan to use my old B&W 640's in relation to a DIY-project. Does anybody know the crossover frequencies in this speaker?

vH pH
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Old 16th October 2004, 12:11 AM   #2
PMik is offline PMik  United States
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If you got the 640i ?

The crossover freq. are 300Hz/3KHz
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Old 16th October 2004, 06:36 AM   #3
27ph is offline 27ph  Denmark
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Nope, no -i, unfortunately

vH pH
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Old 16th October 2004, 11:58 PM   #4
PMik is offline PMik  United States
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B&W website down for the moment....must have been hacked

When it goes online again

The info you need can be reached by this link:

http://www.bwspeakers.com/downloadFi...info_DM640.pdf


Cheers
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Old 17th October 2004, 03:37 PM   #5
PB2 is offline PB2  United States
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Have you traced out the schematic? Can you post or email it, please?
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Old 17th October 2004, 05:36 PM   #6
27ph is offline 27ph  Denmark
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Haven't taken them apart yet, but I plan to mod them at some point: http://www.avahifi.com/root/audio_ba.../ab1990-12.pdf

vH pH
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Old 21st October 2004, 12:16 PM   #7
PMik is offline PMik  United States
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B&W site up and running again.....but unfortunate no x-over freq. mentioned in the 640 PDF......But i believe they cant have changed a great deal from 640 to 640i
call Hi-Fi Klubben.... the one at Frederiksberg have experience with B&W parts afik.
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Old 21st October 2004, 02:11 PM   #8
27ph is offline 27ph  Denmark
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Thank you and mange tak

vH pH
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Old 19th November 2005, 11:49 AM   #9
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Quote:
Originally posted by 27ph
Haven't taken them apart yet, but I plan to mod them at some point: http://www.avahifi.com/root/audio_ba.../ab1990-12.pdf

vH pH
Helloo

I have also a pair off B&W DM640

Will try later too do the mod from the article.

Have you tried in yours?

Have you got the Xover schematic?

Best regards
Mange tak

Kim
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Old 23rd November 2005, 04:49 PM   #10
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Hello

I just got a copy off the DM640 crossover schematic

I wonīt do the mod from the article-> a 0.5ohm resistor in serie with the bass is not a good thing.

Instead I have calculated and bought new crossover components, capacitors is Jantzen Cross cap and a new scanspeak 29005/9700 treble

letīs all see how it sounds in the end
Kim
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