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For that wiring all you have to do is wire all four positives together into one wire. And all four negatives together into another wire then back to the amp check with a meter to make sure you have the right impedance this will only work if your speakers are dual 4 ohm. Otherwise you end up with 2 ohms.
Yes you can. It is not the easiest of tasks but far cheaper than replacing that 18. There are a few places you can get recone kits from so I will list a few of them and let you decide the quality of kit you wish to purchase.
If the tear is large, or the speaker cone is brittle because of age, you might be best off having the speaker completely reconed. There are companies that offer the service, or you can buy replacement cones and do it yourself.
For small tears (an inch or so long), you can glue a patch in place. I have used a piece of a paper coffee filter as a patch, and plain white Elmer's glue slightly thinned with water. Put the patch over the tear and use a small brush to spread a thin layer of glue over it. Give it a day to thoroughly dry and you should be set.
I have found this repair to be more effective on smaller speakers than on large woofers, though. The woofer cones are more mechanically active. But I patched a couple of 15-inch cones that had been punctured for a friend, and they are still playing after a year. So it can't hurt to try.
Ebay sell Cerwin Vega Surround (rubber bit) replacements. If he has ripped the cone too, appart from replacing his back legs with wheels (joke!), contact Cerwin Vega directly and they will send you out a new "driver". These are easily fitted at home by any one with a screwdriver
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.
If you have a warranty on it send it back, if you don't you can do several things. It depends on how bad the tear is. If its a small less than 2 in or so tear, a beed of hot melt glue on both sides of the cone is a sturdy but not permanent fix. If its a large tear you'll need a new cone. I looked a bit online for recone kits for that model but i couldn't find anything. So my advice would be to find a speaker service in your area, or send it back to yamaha for repair. If you want you can do a more thourough search for a recone kit, you might find something... hope you get it workin.
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.