Probably too far apart. Start at 4ft apart and slowly like in 1in increments move them apart. The image should pop into the center. I use one of the Bob Seger Greatest Hits to center the soundstage. His voice ends up directly in the center. Other CDs tend to have a left or right bias so I set with that one. Need some space behind them. I have 3 to 4 ft with my RS-1s. Others can chime in on the amps you are using. I use Thresholds on mine. Still need to give them some volume to get the sound right. Good luck