B&W DM-220 crossover issue

[fazman]

I have an older pair of these speakers and I'm having problems with the crossover...
It seems the resistor caught fire on both speakers and burnt one of the coils to a crisp.
Everything else measures ok, including the drivers thankfully, but the one coil and the resistor are toast. I believe it is the coil in the hi pass section of the crossover.
I can see the resistor is a 2.2 ohm but the coil is not measureable.

Would anyone have a schematic for this speaker that I can get the coil value so I can roll my own or order a new one?

Thanks guys.

[cliffforrest]

see this thread

Restoring B&W 2200

Also do a search on DM220 - there are plenty of references.

Cliff

[fazman]

Originally Posted by cliffforrest

see this thread

Restoring B&W 2200

Also do a search on DM220 - there are plenty of references.

Cliff

Cliff, thank you so much for that!
It is EXACTLY what I was looking for...
I didn't think there would be much info on these speakers on this sight so admitedly, I didn't do a search. I'll know better next time.

The value of that one coil is what I was looking for and I can see from the diagram you have done that it is a .2mH inductor. I couldn't measure mine as it is a crumbling burnt mess!

Thanks again!

[cliffforrest]

I bought my pair some 15 years ago for ~$US50 in a dutch auction, and they are my dining-room speakers.

I love them. Cheapy chipboard, unbraced, crossover componets to make some people here wince! But they sound wonderful!

Are you sure you haven't burned out the tweeters on yours? Something must have been oscillating or severely clipping to do that!

Good luck, anyway, and keep us posted.

[fazman]

Originally Posted by cliff

I bought my pair some 15 years ago for ~$US50 in a dutch auction, and they are my dining-room speakers.

I love them. Cheapy chipboard, unbraced, crossover componets to make some people here wince! But they sound wonderful!

Are you sure you haven't burned out the tweeters on yours? Something must have been oscillating or severely clipping to do that!

Good luck, anyway, and keep us posted.

No... tweets test perfect. This happened to the previous owner not me. It looks like the crossover components took the brunt of the explosion.

I'm anxious now to hear these things... It's great to get great sound out of something built so cheap!