Vandersteen problem

Its probably the Rim seal on the front 8 inch woofer
if you don't have a local Vandersteen dealer to bring
it to you can
remove bases flip it upside down remove the screws and
lower wood panel slowly from the back with a flat wide blade
screwdriver now pull out all staples and pull down the
fabric inspect the 8 inch and you may see the problem.
remove driver and call vandersteen for repair reinstall driver and staple back the grill evenly and you are finished .
John

Here's a pdf of how to get the speaker apart:

http://www.vandersteen.com/pages/Pdffiles/RepairIns.pdf

Thanks for the info! I may attempt to take the problem woofer out myself. On the phone the local dealer suspects only needing repair to the surround and not needing the entire driver. He also suggested doing both woofers while I'm at it.