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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.
I have a similar problem. You need to open your subwoofer and check if the subwoofers cone cloth is torn. If it's torn you can recone the subwoofer and it will work fine. There are solutions online to fix the cloth using regular synthetic mix cloth but i don't know if it works. Try removing the cloth to see if it sounds better.
You can remove the grill in front of the speakers by using 2 mini mini screw driver one to pry it out little by little while the other to hold it from going back in .There are noscrews holding the grill.They are held by 4 clamps which are the grill inner end bend abit out thats all.
So if you pry it will give way not to worry the grill is made of a hard aluminium material it just needs care in order not to scratch the paint surface and aluminium ring around it,use a soft cloth to protect the ring when prying.Remember this aluminium ring wont come out its only the grey grill that will.
This thing is worth saving because it sounds great even after speaker repair.Yes where i am in Idonesia there are people who are profesionals at repairing speakers that are torn out like our harman.(torn due to age around the speaker cone).i paid 15 usd to get the both of them repaired and its the best 15 dollars i have ever spent.Cause now it could not have sounded any newer the bass is back the balance is pure harman again
Use an Ohm meter and test at the speaker. On the speaker magnet there will be an Ohm rating (Usually 4Ohms). The reading could be between 2-6 and you should be OK. Anything outside this range may cause problems. Another to look ta is the surround of the speaker. This the part that connects the cone to the frame. Make sure it is not torn and is still flexible. There are not any user replaceable parts, so if they are blown it is time to get some new speakers.
It may not be worth the expense, but if the cone or surround are torn, they can be replaced by a speaker repair shop. I just had a pair of JL 10W6's re-edged (the foam surround around the cone deteriorated after 11 years), and the repair cost $100 for the pair, including parts.
Bad socket on the computer
Dirty volume control
Dirt in and on the speaker cone
Speaker cone torn slightly
A wireless device that may be too close to them eg cordless phone (I know my cell phone is going to ring before it actually does as I get a signal from my speakers)
I have a can of "electrical contact cleaner" which I use to see if it fixes the first two items.
2nd and third item can only bee seen by opening up the speakers.
for dirt I use an air can for cleaning computers but not too close to the cone.
For a torn cone I replace the speakers.
Last item is pretty ease just move the offending item to a new location.
most of the older Japanese speakers must be repaired ratther than replaced if the frame is squared or odd sized. many had a flange making a 15" speaker a 16" size or were square framed so that a round replacement will not work. if it is a standard size round frame speaker, then this is easily replaced. if the tear is only on the center dome or dustcap, then this can be easily replaced. if the actual cone is torn or there is other damage to the moving parts, then the speaker can be reconed. often modifications must be made due to the current availability of standard sized parts vs the original metric, etc, but in the end, the reconed speaker will perform as closely as possible to the original and sometimes better. [email protected]
Contact MMats Pro Audio at 561-842-0600. They can re-cone it for you, or sell you the re-cone kit. If that does not work for you, contact MWA Speaker Parts in Tuscon - 520-647-7193. They can sell you a re-cone kit, or they can direct you to a speaker repair center near you. A third option would be to contact Sundown Audio in Troutman, NC. They may be able to re-cone it for you.
if no sound from both speakers check fuse, if some hissing or humming on full volume then its a fault in oscilator section if there is no hiss or hum at full volume its a breakage in the wires of speakers, if one speaker is ok its aagain a wire open problem in out put section open up the speakers and just apply 1.5 volts dc for fraction of second to the speaker leads , if theres crackling the speaker is ok also see for torn out cones or stuck cone or speaker coil open.