Can the JBL W15GTi speakers be repaired? I have two that are making "rubbing" noises, with what sounds like collapsed voice coils. Not sure how or why. The amp driving them is a QSC 950 (475 wpc, and never run at anywhere near full volume). Even full volume the amp is half the capability of the driver, so I'm not sure what's going on.
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Check for voice coil resistance. Should be around the stated impedance rating. Assuming it is ok, then move the cone carefully back and forth along the magnet, if any rubbing the coil has been damaged. A damaged coil is not repairable - you replace the driver.
Replace center channel speaker with known good one. If no longer scratchy then the voice coil of removed unit is rubbing against the magnet pole and the speaker needs to be replaced. If the replacement speaker also sounds bad, then the amp for the center channel needs repair.
More than likely you have lost the speakers... You sent TOO much power to them and likely the voice coils have heated and distorted and are rubbing the pole pieces and hanging up on them. If the voice coils now short some of the windings, next you will lose your amps as well. If you can access the cones, you can try gently moving them in and out with your fingers and you can feel the voice coils rubbing sometimes. REMEMBER ALWAYS check the RMS rating of the speakers against the RMS ratings of the amps... DO NOT fall for the "advertising" things of "peak power" and "program power" ratings... these numbers are to sell equipment... Use RMS continuous ratings when sizing amps to speakers. Typically the RMS continuous ratings are 1/3 of the peak or 1/2 of the program ratings. You will find amplifiers rated either way so you have to dig out the real ratings. In bridged mode the full output of both halves of the amp work together. Your speakers are rated at 1600 Watts continuous... I am not sure I believe that number even... you would be deaf in front of that quickly... Your amps appear to deliver 5000 Watts RMS in bridged mode... over three times what the speaker is rated at. Since you have the amps, set one aside and run each speaker from one side of a single amp NOT using full gain AFTER you get the speakers re-coned. I would recommend putting a fuse in the speaker lead to HELP protect the speakers when repaired.
oh yes the JBL GTi W15GTI Mkll. this subwoofer is a dual 6 ohm voice coil subwoofer. This is impossible to run this sub alone and get 1 ohm you will need another JBL GTi W15kll. the lowest impedance you can go to is 3 ohms. you can achieve this by connecting the positive terminals together and then running a wire from the two positives to the positive terminal on the amp. then connecting the negative terminals together and then running a wire to the negative terminal on the amp. this is a real nice sub it just has that one down fall of having a six ohm voice coil.
the braided wires from the speaker connectors to the voice coil could be broken (from repetitive movement) or it could be the voice coil it self that could be cut open from a miss alignment of the cone (ware and tear), delicately push on the cone and feel if it rubs, a simple test is to check the IMPEDANCE of the speaker with a OHMMETER, if you have a reading (4,6,or 8 ohms) than the speaker is fine, check the rest of the wiring, if it reads OPEN than you need a new speaker...
Most likely it is a rubbing voice coil in either the midrange driver or the tweeter. The only way to repair is to replace the bad driver or tweeter with a new part. Contact CV for replacement parts costs. Replacing parts in most speakers is usually easy to do if you have rudimentary tools and skills. Most connections are made with "faston" slip on/off connectors so a soldering iron is usually not needed.
I think that one reason for a speaker to rub is due to over heating of the voice coil. This happens when power is applied to the speaker that is greater than the speaker is capable of handling. A second cause could be that the suspension and or cone is damaged or degraded causing the coil to be tilted or off center. In either case nothing short of rebuilding the speaker can be done to repair the speaker. Rebuilding would involve removing the cone and voice coil and replacing with new items. If you were talented you might be able to repair the existing cone or voice coil but the results could be iffy.