It's a major pain getting at the drivers in a Vandy, given the way that the sock is stretched and attached over the frame. If repair is needed and you want the speaker to look good again, then you will almost certainly need a competent dealer's help, or send it back to Vandersteen.
The noise you describe suggests the possibility of a blown woofer. Hope it turns out to be something less...
The noise you describe suggests the possibility of a blown woofer. Hope it turns out to be something less...