X-over freq in DM40?

[27ph]

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]

If you got the 640i ?

The crossover freq. are 300Hz/3KHz

 

[27ph]

Nope, no -i, unfortunately

vH pH

 

[PMik]

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:

www.bwspeakers.com/downloadFile/speakerModel/DONE_-product_info_DM640.pdf


Cheers

 

[PB2]

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

 

[27ph]

Haven't taken them apart yet, but I plan to mod them at some point: http://www.avahifi.com/root/audio_basics/ab_pdf/ab1990-12.pdf

vH pH

 

[PMik]

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]

Thank you and mange tak

vH pH

 

[kimschips]

Haven't taken them apart yet, but I plan to mod them at some point: http://www.avahifi.com/root/audio_basics/ab_pdf/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]

Hello

I just got a copy off the DM640 crossover schematic

I won´t 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

let´s all see how it sounds in the end
Kim