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-   -   X-over freq in DM40? (http://www.diyaudio.com/forums/multi-way/40977-x-over-freq-dm40.html)

27ph 15th September 2004 03:10 PM

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

PMik 15th October 2004 11:11 PM

2 Attachment(s)
If you got the 640i ?

The crossover freq. are 300Hz/3KHz ;)

27ph 16th October 2004 05:36 AM

Nope, no -i, unfortunately

vH pH

PMik 16th October 2004 10:58 PM

B&W website down for the moment....must have been hacked :xeye:

When it goes online again ;)

The info you need can be reached by this link:

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


Cheers :drink:

PB2 17th October 2004 02:37 PM

Have you traced out the schematic? Can you post or email it, please?

27ph 17th October 2004 04:36 PM

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

PMik 21st October 2004 11:16 AM

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. ;)

27ph 21st October 2004 01:11 PM

Thank you and mange tak

vH pH

kimschips 19th November 2005 10:49 AM

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

kimschips 23rd November 2005 03:49 PM

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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