Jared, you could always set the center channel speaker on something to raise it that 1.5" distance.

I don't know if they'd work with your particular entertainment center, but something like the Auralex Mopads would serve to both raise the center channel speaker, decouple the speaker from the entertainment center (i.e., prevent the speaker from causing the EC to vibrate), and angle it down toward the listening area. They are adjustable to angles angles of 0, 4, 8, -4 and -8 degrees.

Jack

"People generally quarrel because they cannot argue." - G. K. Chesterton