B&W DM7 tweeter problem

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chameloman72

Active Member

• Dec 5, 2010

• #1

Both tweeters on my DM7's are very weak, hardly any sound coming out. Well, I got a hair up my a** and sprayed one tweeter with deoxit and within minutes I had full tweeter output! Now, after a couple days the deoxit has dried out and the tweeters are weak again:tears:. What can I put on them as a permanent solution and what is causing this? Any help well appreciated! Thanks

 

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larsne

Active Member

• Dec 6, 2010

• #2

Same problem? http://audiokarma.net/forums/showthread.php?t=48842

 

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chameloman72

Active Member

• Dec 6, 2010

• #3

larsne said:

Same problem? http://audiokarma.net/forums/showthread.php?t=48842

Click to expand...

I'll be damned, it worked! A little shellac and they sound better than they ever have! I still don't understand how sealing the dome gave the tweeters high output?? That baffles me! One would think that by letting air into the voice coils it would cool them, no? Anyway, I am once again a happy camper! Thanks

 

GordonW

Speakerfixer

Subscriber

• Dec 6, 2010

• #4

The dome becomes porous... and begins to "leak" air when it moves. The shellac re-seals the fabric, making it air-tight, and making it possible for it to "move air" better, when it moves...

Regards,
Gordon.

 

jmitchnh

Active Member

• Jan 17, 2014

• #5

I know this is an old thread but I just purchased a pair of DM7 Mk2 with the same issue. The tweeter does technically work, but I have to put my ear literally right on the tweeter to hear any output.
Any suggestions/tips as to how to do this correctly (IE what type of shellac to use?). These speakers are beautiful and in mint condition so I don't want to do anything that might damage them.
Thanks!

 

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shovelhead

Active Member

• Jan 17, 2014

• #6

did it to mine ysed shellac from the hardware store forget the brand can look if u like.two coats let dry well inbetween coats transformed them sound beautiful.