You definitely need a rack. I know that Denon is not light, you're going to destroy your TV if you keep stacking sh!t on top of it!

If you don't get a rack, you'll be awakened one night by a huge crash only to stumble into the living room to see the whole system lying on the floor, totally ruined.

Get a rack.

Actually I'd move the TV over about 2 feet and get rid of those Orb's! Put some nice towers on either side of the TV and a nice center on the TV, talk about a 1 million times improvement!