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Old 4th September 2004, 11:48 AM   #1
r!sc! is offline r!sc!  Serbia
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Default B&W DM601 crossover shematic - anyone

Hi,

i need crossover schematic for DM601 (s2), so is there anyone who want to help .

Thanks, Boban
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Old 4th September 2004, 11:25 PM   #2
jomor is offline jomor  Greece
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I own the BW DM601 first edition, i m not sure if its the same with the one you re asking.

Its a parallel crossover with 1st order low pass and a 3rd order hi pass. It also has a resistor to lower the tweeter's output. The inductors' values are not mentioned. The crossover's x frequency is 3Khz. There isnt any zobel or notch filter. The high pass filter's capacitors are 10F and 4.7F electrolytics ( which i replaced them with polypropylene ones of course, and the sound improved tremendously)

Sorry if i wasn't much helpful
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Old 4th September 2004, 11:29 PM   #3
r!sc! is offline r!sc!  Serbia
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Thanks jomor, very usefully.

Boban
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Old 16th November 2011, 09:23 AM   #4
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Hi there to both of you.
I am just wandering... Jomor, I have just bought a pair of DM601's and am interested in changing the capacitors for polypropylene ones. I have seen ones available on the Maplin website here: -

Audio-Grade Polypropylene Axial Capacitors : Polypropylene : Maplin Electronics

However, if you look, the units of measurements are 'uF' which I'm guessing is microFarrads. Is this the same as the F that you have written above? And also, should I only change the capacitors on the high pass filter or should I do the low as well? And finally, do you know of anywhere cheaper to buy these capacitors at all. Not that they are that expensive anyway but it's always nice to save a bit of cash.

Many thanks
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Old 16th November 2011, 03:52 PM   #5
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iF is a mistake. And yes uF is microfarrads.

Sometimes you get big upgrades when replacing elecrolytics with polyprops and sometimes nothing happens.

These sound pretty good and they're cheap: Mundorf MCap MKP Polypropylene Film Audio Capacitors

If you want a nice neutral sounding cap, the Ansar polyprops are good and not too expensive (ATC use them IIRC): http://www.cricklewoodelectronics.co...me.php?cat=155

Last edited by fatmarley; 16th November 2011 at 03:55 PM.
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Old 16th November 2011, 06:31 PM   #6
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Quote:
Originally Posted by r!sc! View Post
i need crossover schematic for DM601 (s2), so is there anyone who want to help .
Here ya go...circuit on page 9, parts values on page 7.

Manual came from here:
B&W Loudspeaker Service Manuals Available
Attached Files
File Type: zip DM601-TM.zip (453.3 KB, 60 views)
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Old 17th November 2011, 12:40 AM   #7
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Quote:
Originally Posted by Liamadams View Post
should I only change the capacitors on the high pass filter or should I do the low as well?
Do you have caps in the low pass filter?
Only L1=0.95mH inductor for a 1st order and a 3rd order high pass.
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Last edited by Inductor; 17th November 2011 at 12:43 AM.
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