Subwoofer has a constant vibrating tone that will not go away
The subwoofer has a constantbuzzing noise that when reduced to the lowest volume, there is still a faint buzzing sound. I have diconnected it from the computer and there is still a buzzing noise. It is coming from the the center of the speaker in the cone section. Please help. Thanks!
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Re: Subwoofer has a constant vibrating tone that will not...
I suspect that what you are hearing is the 60 cps of the mains. If the humming sound is coming the subwoofer itself, then it is possible that you have a defective/leaky capacitor in the power supply section of the subwoofer. In the subwoofer, if the buzzing sound is coming from anywhere else other than the speaker itself, then it is possible that you have a loose transformer again in the power supply. Unless you are comfortable working with testers and soldering irons, I would suggest an electronics technician who should be able to diagnose and fix it for you.
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Does the subwoofer have the same hum when the input cables have been unplugged? Many input cables use very fine conductors, which often fail. A bad cable will often introduce a hum and prevent a signal from getting through. If the noise is still present without the input cable(s) connected, then repair options are limited. No schematics are available. There's a daughterboard that has been available, but its failure usually causes the system to die (short-circuit). The cost to repair the amplifier may be close to the cost to replace the entire sub.
This method will be easier and less time consuming than "crawling for bass." Required equipment needed but not limited to, an SPL meter and test tone generator.
Place your subwoofer firmly where your prime listening position will be, with the driver pointed in an unobstructed direction. It is best to place it exactly in your seating position at or near ear level if possible in whatever manner you deem is safe for you and your equipment. If using a downfiring model placed on a couch, sit on a peice of plywood.
Adjust the volume control as close as possible to where reference level would be at the lowest frequency for your subwoofer model.
Run sweep tone through the sub and measure output on your SPL meter from the possible locations that your subwoofer could be placed in the room. Place the meter as close as possible to where the subwoofer would be, either held in hand or tripod mounted, or any other placement method that does not subject the meter to vibration. The position with the flatest response is ideal, however, differences in media usage or crossover setup then one may desire a higher output at a given frequency. This method will tell you exactly where to put the sub without having to move it around!
I would suggest your crossover unit has failed in the speaker cabinet. The crossover circuit board separates the low and high frequency content of your stereos audio signal. The low frequencies go to the bass unit (woofer) and the high frequencies go to the tweeter speaker. If the capacitor on the crossover goes open or near open circuit then noise is introduced into the sound system. Replace either the capacitor or crossover unit.
I had a problem closely with my FPS 1000 4.1 sound works four point surrond : my subwoofer sounds a metallic noise when the bass are loud. Maybe it is the same problem ? :
It were vibrations that go through the subwoofer and cause the noise.
Check the four screw well (the four hole on the back of the subwoofer). Put your finger on them to clog them and hear if your problem is solved. If yes, put scotch on them.
Secondly (i think you have disassemble your subwoofer), you can put silicon joincture on the box near the circuit, under the translucides cables. (the box where there are the plugs). >> if there are any hole between his box and the speaker, there will be some metallic noise (vibrations trough the box and the back plugs).
Offhand, could either be the subwoofer speaker itself or the electronics (amp and/or crossover). One way to determine is by physcially checking the sub speaker. When playing with bass on, pls try restricting speaker movement by pressing on it and see if the noise is reduced. Another is to temporarily replace the speaker. You can try speakers meant for the car, home entertainment or book shelf, just dont set the volume too high.
If the speakers are ruled out, then it would be the electronics inside. For this, you would need familiairty with electronic components and circuittry, a DVM and a soldering iron. Access to an oscilloscope and an audio signal generator would be nice but not a necessity. The idea is to inject a constant audio signal and determine where the noise (if electronic) is coming from. In most instances, it would be a leaky electrolytic capacitor either in the input stage or feedback loop. At other times, it would be also a capacitor in the band pass filter.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.