If you raise the Heresy's off the floor you will be loosing some bass reinforcement at the possible benefit to the midrange and soundstaging (in my experience). I worked hard to get an early pair of Heresy's to sing, though I mostly work with push/pull tube amps at the time. Based on some pretty thorough experimenting, including raising them to different levels and trying them out for weeks at a time, my best advice to you if you like that sound is to sell the Heresys and buy a pair of Cornwalls, or if you're really into head-banging rock try vintage Forte II's or Chorus II's. As far as height of Heresy stands; as a cheap experiment you use cinder blocks to do this - four blocks would give you various heights to listen to. My observations were that the further off the ground, the ligther the bass. I ended up with them low to the ground, toed up at an angle to the listener.
Good luck.
Marco
Good luck.
Marco