From the Audioholics review: "The next step was to check placement with my low frequency sweep test. I began placing the subwoofer at various locations around the room. I noticed right away that the Velodyne HGS-15X didn't particularly care where it was placed: corner loading, 1/3 in from the sidewall, 1/2 in from the sidewall, and various other locations. It yielded excellent results; it never sounded boomy, dry, flat, or localized - regardless of where it was placed. This is an easy subwoofer to integrate into just about any installation regardless of placement requirements. Let me point out this is not the normal occurrence when dealing with most subwoofer integrations into high-end systems. Most of the time subwoofers require exact placement for proper integration. The Velodyne HGS-15X was the exception; I placed the subwoofer 1/3 in from the sidewall on the front wall for the rest of the evaluation. Using tests discs like those from Rives or other companies are useful when trying to determine subwoofer placement and integration in your room."
On top of which I own the 18" version and have had the same experience. Sorry, but I don't think I'm that "out there" as you suggest.