Call your dealer and see what tech they use. I'm guessing if you have warranty you bought them from dealer?
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Just do it your self. I changed a tweeter in my 2.4 can it took about 5 minutes (I don't solder either).
I called up thiel and they even sent me some of the solder they used in the speakers for free. Make sure you use flux (the silver solder will bot have flux in it so you need to use some) get the wire pretty hot before putting on the solder... Super easy. Go to radio shack and get a 60 watt iron for $20.
Well I soldered it. I didn't get y'all's responses until after so I ended up reading about how silver flows easier and at lower volume and used that. Though im not sure i found this to be the case. The wires go through a hole in the back of the the knurlled nut about 3/8", so in order to resolder I had to cut the tweeter connection also so I could pull out the connector. Then I took the nut in my bench vice, locked it in, and heated the solder with my acetylene torch until I could suck out the puddled hot solder. Once i had the nut installed i stripped the two loose wires, stuck them in the hole and gave it a go.
I will tell you this there wasn't much slack in the cable that was left, and I was afraid if I pulled on it I would pull the wire off the crossover. Due to the fact that there wasnt much slack, once the nut was installed on the backing plate it only left me a narrow window to work in. about an 1 1/2". i was very nervous i was going to screw this up since if i did there would be no second chances. If I messed up there would be no more slack in the wire to recut, restrip and go through the process again. My hands were shaking and I found it difficult to get the solder started, but I did eventually though I'm 100% sure it's a perfect joint. I did tug on the connection and it seemed strong and didn't come out.
Listening tests showed everything sounds fine. There is just that nagging thought in the back of my head I didn't do it right. I guess I'll never know.
Well, I called Thiel and spoke with Gary. Very nice fellow. I asked what he would have suggested I do and he said that he would have asked if I could solder! I went over my entire proceedure and he agreed with it. So I guess I did the right thing. He stated that in a case like mine this risk of shipping it and having it damaged would outweigh his concern for me soldering it. He said my trying to fix it would not void my warranty and that if I had to return them for any reason they would be able to tell and honest attempt to repair and would not hold me responsible. He said he was more concerned with my enjoyment of listening and ownership of the speaker and as long as I was happy so was he.
You got to give it Thiel for honest customer service.