Flapping noise from my 8x8 cabinet
Hey guys, I got a yorkville 8x8 cab for an insanely good deal used but I'm noticing a flapping noise from the top right speaker. It sounds like flapping paper or the speaker cone Vibrating against something. It is only on one speaker and I can hear it the loudest through the narrow side vent/port on the cab (there are ports/vents top to bottom on either side) the noise seems to be covered up when turning up the amp (can still hear it but its drown out by the actual notes) but its quite loud at practice levels and is really annoying when I'm jamming on my own. I haven't had time to pull the speaker out and examine it but if everything looks ok what should my next step be? I have read about "chuffing" but I don't quite understand what it should sound like. Should I replace the speaker (since the noise seems localized on the one speaker only) or is it likely something else?
Thanks in advance for the help!
It could be a couple of things. The driver's mounting screws may be loose, easily checked. While the grill is off, push against the cone lightly with your fingertips and if you feel scraping, the voicecoil is blown and you'll need to recone or replace the driver. If there's no scraping, pull the nearest handle or jackplate and shine a flashlight on the rear of the driver to see if anything (loose wire or insulation) is touching the back side of the cone. Let us know what you find. -Bob
Thanks man, ill open it up tomorrow and see what I can find!
The spider may have come loose. The glue dries out sometimes. This is the best scenario, easiest to fix. Don't jump to conclusions in cases like this.
1) push on the cone gently and EVENLY with your fingers on two sides of the cone.
2) If there is no rubbing sound and the cone moves freely in and out and it's not frozen in place, then it's probably the spider.
3) if 2 above, then carefully remove the driver. Turn it over and inspect the spider to see if it has any gaps between it and the magnet structure.
The spider can be glued back down. If you need help with that, post again.
Opened up the cab, pressed on the cone and there was a scratching sound. All other speakers were silent. Took out the speaker and tried the test again when it was unhooked. No scratching. Hooked it back up again and it scratches again. Does this mean a bad voice coil? Why does it only scratch when wired up to the cab?
When connected up, the voice coil has others in parallel with it. These tend to "damp" cone movement. If the coil scrapes "in circuit" and the others don't you should replace the bad driver.
You have not filled out your profile so we don't know where you live. If we knew, there could possibly be one of us near enough to you to help personally.
I should get on the profile one of these days. I'm up in Canada. Saskatchewan in particular. Not a lot of amp techs around here
Nowt wrong with being in Canada my brother! :D
Let us know how that cabinet does after it is fixed. I am interested in how it compares to a 610.
Just FYI, if the voice coil is fried, you want to re-cone that driver, not "replace" it with something other than a factory spec.
Since it hasn't come up yet, did You check that the speaker is still working?
With a multmeter preferably, the battery test ONLY with all the speakers wired.
Most drivers can take 9V alone, but not all of them.
A driver turned into a passive radiator will flap around its resonant frequency.
Scuffing sound can IMO be described as the inrush sound of air on a vacuum cleaner nozzle.
Does sound like a bent basket, very common with heavy ceramic magnets on wimpy stamped steel baskets.
One of the real reasons behind that ancient debate about the correct orientation in which to transport big (cheap) speakers :).
Straightening a bent basket out is a crapshoot at best, and IME only a band aid fix even then.
No matter how well You manage to align the voice coil the damage has been done to the VC, or the wires insulation at least, and it'll break sooner or later.
You may get a few more miles out of it by visually examining the mounting edge resting on the baffle, looking for gaps and shimming them.
Looking for any irregularities on the baffle mounting surface and the seal as well. Obviously.
Shimming a bent basket airtight so no scratching is felt/heard when all the mounting screws are tightened is a bit time consuming, but if the replacement is hard to get or the money is tight, that'll give You some time to source the replacement.
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