Pretty close - the back of the lower base modules are 18.5" from the back
wall. It's hard to tell without actually standing near the rear of the
speakers or measuring them, which I just did. The outer front electrostatic
panels are 31" from the wall, with the inner front panels toed-in to 30"
from the wall, per the specifications in Martin Logan's Quest Z manual which
came with the speakers.

Sound about right to you?




Have you tried moving them out further from the back wall? Do you have any
absorbtion or diffusion on the wall behind them?