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Junior Varsity
Peavey SP4 speakers nackered, new baskets or magnets?
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<blockquote data-quote="Charlie Hughes" data-source="post: 67746" data-attributes="member: 474"><p>Re: Peavey SP4 speakers nackered, new baskets or magnets?</p><p></p><p>Hi Richard,</p><p>From listening to the videos you posted the "bad" drivers sounds like something is rubbing. Try taking them out of the cabinet and slowly moving the cone on each one to see if you hear or feel something rubbing. You may have to put your fingers in different positions on the cone and move it. Some positions may elicit a rubbing feeling, some may not, or it may not feel like there is a rub at all. If you do feel a rub, remove the magnet structure from the basket & clean the voice coil gap in the magnet structure. Use masking tape folded over itself several times to make a triangle with the adhesive on the outside. Run this "football" of masking tape around the gap to clean it out. Put the magnet back on the basket & try the driver out again. Also look at the voice coils on the drivers to make sure nothing looks wrong with them, like a burr or something that might cause the buzzing sound.</p><p></p><p>The other thing that may be happening is that the lead wires (tinsel leads) from the driver terminals that go into the back side of the cone may be slapping against the cone & causing the buzzing sound. Gently pull these away from the cone, but not out of the cone. The tinsel leads should kind of loop out & away from the cone and go on their way to the input terminals. You can test for this slapping by playing full-range music or low frequency sine waves directly into the driver while it is out of the cabinet (no crossover needed). If using a sine wave you may have to change the frequency to get the tinsel leads to buzz. You shouldn't have to turn the driver up too loud for this. If this is the problem you'll know it when you hear it. You'll also be able to see the tinsel leads slapping the cone.</p><p></p><p>FWIW, I redesigned at least 2 different iterations of the SP4 when I worked at Peavey many years ago. Good luck trouble shooting the problem & getting it fixed.</p></blockquote><p></p>
[QUOTE="Charlie Hughes, post: 67746, member: 474"] Re: Peavey SP4 speakers nackered, new baskets or magnets? Hi Richard, From listening to the videos you posted the "bad" drivers sounds like something is rubbing. Try taking them out of the cabinet and slowly moving the cone on each one to see if you hear or feel something rubbing. You may have to put your fingers in different positions on the cone and move it. Some positions may elicit a rubbing feeling, some may not, or it may not feel like there is a rub at all. If you do feel a rub, remove the magnet structure from the basket & clean the voice coil gap in the magnet structure. Use masking tape folded over itself several times to make a triangle with the adhesive on the outside. Run this "football" of masking tape around the gap to clean it out. Put the magnet back on the basket & try the driver out again. Also look at the voice coils on the drivers to make sure nothing looks wrong with them, like a burr or something that might cause the buzzing sound. The other thing that may be happening is that the lead wires (tinsel leads) from the driver terminals that go into the back side of the cone may be slapping against the cone & causing the buzzing sound. Gently pull these away from the cone, but not out of the cone. The tinsel leads should kind of loop out & away from the cone and go on their way to the input terminals. You can test for this slapping by playing full-range music or low frequency sine waves directly into the driver while it is out of the cabinet (no crossover needed). If using a sine wave you may have to change the frequency to get the tinsel leads to buzz. You shouldn't have to turn the driver up too loud for this. If this is the problem you'll know it when you hear it. You'll also be able to see the tinsel leads slapping the cone. FWIW, I redesigned at least 2 different iterations of the SP4 when I worked at Peavey many years ago. Good luck trouble shooting the problem & getting it fixed. [/QUOTE]
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Peavey SP4 speakers nackered, new baskets or magnets?
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