I didn't really want rear speakers. I knew I put very good equipment up front where proper sound-staging should be. Also, no one really sits behind me so there's no need for speakers back there. Music from the Z6's on a wall sounds good but if they're properly amped they sound awesome. Now awesome to me may be different from your interpretation... I wanted absolute accurate reproduction of music as if I were there listening to it live. That's what I found with the Z6's . The MBQuart QSD's sounded good too but in a different way. If you listened to Dave Mathews he sounded for real on the Z6's but on the MBQ's Dave had grown some nads and got hair on his chest. Some may like that "artificial" sound to their music but I prefer the real thing.
Jack
