Depends on which model of 1’s you have. I have a set of 1’s from probably the late 90’s/early 20’s. I only paid about $325 for them shipped in really great condition. It won’t take much to spend as much as their worth on repairs.
You might try Millersound (in PA). Send Bill the speaker and have him rebuild if/as necessary. But, call him first and explain your issue, he may be able to trouble-shoot over the phone per your issue. Probably about $125 for a driver rebuild including shipping. Shipping the driver to Vandersteen may cost twice that. I know as Bill rebuilt one of the acoustic couplers on my 2CE Sigs, and Vanersteen wanted twice the amount for repair.
Sending in the whole speaker for a crossover fix will start to cost quite a bit just for shipping, plus repair. And getting to to crossover panel is not easy on the 1,2, and 3’s. And no, depending on your particular model, upgrades could be extremely limited. As stated, if Bill @ Millersound thinks it is something other than the driver, call Richard, or Vandersteen, directly. He/they can give you an idea what repairs may cost, but it won’t be cheap vs their value.
Then make a decision. You can easily pick up another used set for under $400~500, and perhaps part-out your current set.
