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Last night I redid the surrounds on the woofers and one
turned out fine, the other has a buzz that increases with
volume. I have tried other receivers and changed out the
leads,no immprovement. Visually I see nothing wrong, when
the cone is depressed the travel is smooth, no drag. The
only other thing I can think of is to ttry to unstick the
outer edge of the surround and reglue. Hate to do that
without some kind of input.I didn't listen to them prior to the new surrounds so I don't
know if the noise was there prior. Got them from the original
owner, dated July 1973.
Follow Ups:
Yesterday while I was cleaning off the old surround on an Infinity RSe woofer, I heard a cliking noise when I tipped it over to dump the crud. Looking through the dust cap (sort of an open weave material) I could see something inside. I carefully cut around the dustcap and found that there is a clear plastic 'inner' dustcap right at the voice coil. The glue had come loose. After I put on the new surround I will glue it back and then glue back the outer dustcap. Never saw anything like this before.Rob
This may be a dumb suggestion, but here goes, are you sure it's the coil and not the mounting bolts, or does it buzz when the driver is not mounted?
I removed the woofer from the cabinet and wired directly to the
woofer. Same results, good sounding music, but a buzz that is
very easy to hear. To answer one of the other post, I didnot
remove the dust cover and shim the coil. I was told by the
folks that I got the surrounds from that this speaker has
a loose tolerance and would probably not need shimming. If
I don't get any other suggestions I will work the surround
loose at the outer rim, remove the dust cover and start over.
Still wondering how the cone can move freely and the coil be
the problem. Is there anything to look for when the dust cover
is off?
I have refoamed a Bose 601 woofer that I swore didn't rub, but after I put it in the cabinet there was a slight buzz. If I am careful with moving the woofer in and out it is sometimes there, sometimes not. Bottom line is that I need to reglue the surround, and see if I can get it centered this time. Hard to spot, tho, just by moving the driver in and out by hand.Another couple of ideas to maybe check out - I'd take a quick look at the spider as you move the cone in and out - is there any part of it around the frame or VC attachment points that looks loose? I'm imagining that could cause a buzz. Also, I'd check out the VC to cone attachment point - anything loose there?
Beyond that, could perhaps be trash in between the VC and the magnet pole piece?
Let us know how it turns out...
Cheers,PBG
Is this buzz from the mechanical motion of the voice coil or does it seem to be electrical.Something you might try is putting a 1 1/2 volt battery across the woofer terminals,connected one way will drive the cone out ,the other way in. Do it only momentarily, to find out if you hear any rubbing of the voice coil.I'm not sure if this will eliminate the possibility of it rubbing when it's in use , but it might help isolate the problem. There could be a piece of debris or dirt in there too.
When I refoamed my L Advents ,I used the battery idea to drive the foam surround into the glue.But you're right about the looser tolerance, I'm not sure this idea would work with a close tolerance voice coil.
You did shim the voice-coil didn't you? When a re-foam turns
out to be less than desired, I've had good luck by putting
shims all the way around the voice-coil and dampening the
speaker cone with water. Try to apply water with a small brush
until the paper is saturated. Don't let the water get in the
spider. This will relax stress in the cone and hopefully solve
your problem.Happy new year to you all
You might as well try and re-do the surround, can't get any worse, right? I always listen to the woofers before doing a refoam, it doesn't pay to do the work and find there is something else wrong or that the woofer doesn't play at all. So far, I've only done one set of small Advents, the woofer size is a bit odd, as I recall it was in-between an 8" and a 10". I used a generic surround, it didn't look "right" when I was done but it sounded fine... I'd check the voice coil wires, maybe one is loose and rattling against the cone. A drop of glue can fix that.
Good Luck
--Matt
It sounds like the voice coil was damaged by the woofer being played with a bad surround. The good news is that you should be able to snag another woofer.Dave
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