I think the preffered method is to lay them down flat on their side and stack them.They do roll away at times,but this gives a more rounded out sound effect and kind of fun to chase if you are bored.
If I had another SVS (have they announced winners yet?), I'd like to stack it on my current one. Obi's Tower of Power was totally cool. If you haven't seen it the Tower, check it out http://www.hometheaterforum.com/htfo...tower+of+power It's truly something to behold . Check out the pictures later in the thread as Obi (via Tom's assurance that it was okay) made the tower more symetrical. Still wish SVS would come out with a similar contraption to add to dual subs (hint hint again again ).
Steve