How about approaching the problem from a different angle? The low diffraction curved shape and relatively small baffle size of your ATCs ensure that they have very wide dispersion. Although they can sound fantastic in a traditional listening room arrangement, in your particular application this is not a good thing. I would imagine switching to a "controlled directivity" speaker design like a dipole or horn design which significantly reduces the ratio of reflected-vs-direct sound energy would be a real boon.
Traditional full-range flat panel dipoles like electrostats or Magnepans do tend to be quite large but at the same time, most offer a cool architectural look that might fit right in to your modern living space. The same could be said of some modern full range horn designs like the Avante Gards. In my personal experience, even the smaller hybrid panel/dynamic bass driver designs like those of Martin Logan could really improve the situation.
Other more traditionallooking suggestions that also appeal to our fetish for active loudspeaker designs are the Linkwitz Orion dynamic dipoles and the active version of the Gradient Revolution with it's cardoid radiation pattern.
Happy Trails! Vince@freewheelcycle.com
2ch: Jay's Audio CDT2 Mk3, PS DirectStream Dac, Oracle Delphi VI/SME V/Benz LP-S, Coincident Statement Linestage, Foundation Research V5 Phono, JL Audio CR-1 xover M-ch: OppoMod 203, Anthem AVM60, 2x 557 2x or 5x ATC SCM20ASL mk2, 4x SCM12i, 4x Seaton Submersive HP, AM2.0 sub EQ Video: JVC X990, Isco 3L A-lens/sled, 105" motorized 2.37:1 AT screen
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