First try swapping the leads on your source, powering the left speaker with the right channel, and the right speaker with the left, if the problem follows, then the issue is with your source, and not the speaker. If the cone is torn, then try to patch it, using some basic glue and several layers of tissue paper. White Glue, embed tissue paper in the glue, more glue,embed tissue paper in the glue, do this several times building up several layers. Guessing this is a standard paper cone... Now if you are still having the issue, could be that the woofer is damaged. Look for a replacement.
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If it is a woofer, you would probably fix it quite easy. If the speaker driver is used for both bass and midrange, you have a problem.
Fixing a speaker cone is depending on the material. If it is paper cone, it is very easy by using paper that you glue with wood glue (White water based glue) on to the cones rear side (for estetic reasons).
A midrange or bass/midrange driver is operating in frequencies where the cone starts to break up. Not torn apart, but the break up frequency is the frequency where the inner and outer part of the cone not longer follow each other in the same direction. These properties of a cone determine the sound of the speaker which is that type of speaker drivers "identity". Messing that identity up, you end up with a speaker that does not sound as the original one.
Remember that cross over network used to split up frequency ranges, not only are lowpass, bandpass, and highpass filter, but they also filter irregularities where the speaker driver is not longer providing a linear frequency response (Its characteristic sound).
If the cone is polypropylene, there isn't much glue that bite on that material.
It could be anything from a damaged speaker cone to a loose / rattling glued joint, screw, etc. If it's under warranty (after only 90 days I would hope so) let the manufacturer handle it for you. Otherwise, I'd crack it open and see what it needs and decide how to proceed after getting prices for replacement parts.
Do not use any glues over the foam, it makes the foam get harder and probality of further damage leading speaker replacement. If you have a masking paper tape try to stick on torn area atleast to avoid further damage. But, all this attempts will give a loss on speaker's audio response. If you are not a big audio phile , you can manage doing it.
Those cone covers are important because they distribute the audio of the driver over a wider range. The defect will not cause further troubles nor will it get worse. Most people are capable of repairing them yourself. If you lost the old cone a replacement is necessary. You will need preferably the part number off the back of the speaker to get a replacement. Carefully measuring the diameter of the cone according to where the old glue shows it was attached will also get you the part. Just use Elmer's White glue to reattach. It get's tacky after a few minutes and the cone should sit there and dry for a few hours after replacement. Check for speaker repair parts online. You will find bunches of suppliers.
I think you've just answered your own question. It sounds as if you've coned the sub woofer. Meaning you've fractured the bond between the edge of the speaker body with the speaker cone. Or overheated the voice coil and it's distorted and not getting free movement. Excuse the Pun but it "sounds" like you need a new speaker as a replacement. If it's a particularly expensive speaker it can be reconed. A check of the Net for someone close to you will find a company who recones them. If it's a cheaper one then a replacement would be in order.
it could be a loose connection or the cone is cracked inside , the only way to find out is to open and take a look inside ,check the connections , the 2 wires from box to speaker, ALSO CHECK where the cone meets with the magnet , hope this helps AJ
You may have broken the cross over, which is fixable by an service agent, or you may have damaged the voice coil in the mid driver. you can check this by sofly pushing the main driver in, making sure that you done push the cone, if there is a lot of resistance then you have damaged the voice coil, and you will need to replace the driver.