While a loudspeaker in operation is also a generator, being a coil of wire moving in a magnetic field, amplifier design allows for this back emf so it doesn't cause problems so it is doubtful the drive unit is actually creating static.
It might be due to damp or mishandling among other causes the speech coil of the drive unit is no longer properly aligned and when moving further under increased bass it is rubbing on the magnet. Dust or dirt ingress can have a similar effect.
If it is an active subwoofer it could have an electrical fault (dry joint perhaps or a faulty component creating noise), be overloaded or otherwise mismatched with the amplifier.
SOURCE: low level noise causing sub flutter
Power wires and sound cables running close together can cause this problem. Separate them.
SOURCE: Auto Sub woofer
There are several causes of distortion in an audio setup.
1) Speaker is unable to handle the frequency that it's being fed
2) The volume is too high for the speaker to handle
3) The amp can't provide enough power to drive the speaker adequately.
Either way distortion is BAD & best to be avoided unless you want an excuse to buy a new set of speakers :P
SOURCE: Panasonic SA-PT1050 Surround sound system. The
error message when i try test center speaker not working
SOURCE: How to disassemble Logitech Z-340 sub-woofer
The speaker bezel can be removed in only two ways:
1) Somehow remove the grille in order to get a the screws which hold the bezel onto the cabinet. I tried to do this and couldn't get it to budge. Once I got the thing open I observed that Logitech used a LOT of glue to hold this thing together.
2) Drill holes THROUGH the grill above each of the 8 screws large enough so you can loosen the screws.
Once you get it open, you'll be shocked to discover what you thought was the subwoofer cone is actually A ROUND PIECE OF CARDBOARD fastened to the foam. The 4" driver is behind this fastened to a board halfway back pointing into the chamber containing the electronics.
You can get to the power transformer, but good luck removing it. The screws are nearly impossible to unfasten; more glue but more importantly incredibly awful access to the nut and screw (yes, a screw, not a bolt).
I wouldn't pay 5 bucks for this system. Luckily, I didn't.
SOURCE: sub woofer got weak
If there is an adjustment, turn up the subwoofer volume. After you started shaking the house somebody may have adjusted it for you.
Check your computer control panels volume too, cause they may have a subwoofer volume there too.
If there is an equalizer (software) then make sure the low frequencies are set properly (middle or above). Check for this in your computer audio control panels.
If there is no adjustment anywhere, take it back, 'cause it is busted. If it is too late to take it back, sent it to logitech for repair under warranty. If it is too late for that, go buy a new one.
--Dave
Testimonial: "thank you very much all my adjustments are the same it must be busted."
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