The “sub crawl” is a little-known way you can optimize the placement of your surround sound system’s subwoofer. It can seem odd, but it will get you the best sound out of your expensive new tech. Few people know about this “sub crawl” as it’s called. Yet it pays to get the placement right, because the subwoofer is a critical part of a sound system. I wouldn’t move a perfectly placed couch or switch a TV to an awkward corner just to sub crawl.