Check the crossover. I had the same problem with a pair of 2CE speakers. Turned out to be a bad component in the crossover.
Vandersteen Model 1 Driver Failure: Worth Fixing?
An older pair of Model 1s now has a larger driver which is not working. Visual inspection did not reveal anything obvious, i.e., simple. Given their age, is pursuing repair/refurb through Vandersteen worth the cost/effort? Nephew in Denver has them. Any recommended shops around there to look at them? THANKS!