Regarding placement of your new V-10 Shockwaves. My VSA VR100XS system includes a pair of the XS-15" subwoofers. During the installation of the system, we compared placing the subs next to the towers with placing them at the rear of the room. With the rear placement, they take the system to another level, opening the soundstage into the listening room as well as neutralizing bass nodes. Be sure to adjust the phase rotation control. Once you get that dialed in, the subs disappear as separate sound sources. The extended low frequencies integrate perfectly with the main speakers with a low end that really adds to the realism, but that opening-up of the soundstage is their special achievement.