Boundary reinforcement issues can be addressed by taking them into account in the design stage. So can coloration due to wrap-around reflection energy (by using directional speakers, like the aforementioned Klipsch). The remaining issue is soundstage depth.
One technique which results in good soundstage depth is flush-mounting the speakers. This is often done by high-end recording studios. Precision to 1/8" or better is required, but the result is zero early reflections off that wall, so no corresponding cues are superimposed atop the soundstage on the recording. Note that most "in-wall" speakers have reflective and/or diffractive features which betray the presence of the wall.
Another is to design the enclosure to effectively blend into the wall, so that acoustically it’s like a "bump" on the wall. The midrange/tweeter module of the (sadly discontinued) Snell Type A fits this description, and its downward-firing woofer was close enough to the wall and floor to interact benignly with both of them.
There is another technique for getting soundstage depth with against-the-wall placement which I use in some of my designs. They work better with some spacing, but still imo better than most without. If anyone is curious I’ll describe.
Duke
One technique which results in good soundstage depth is flush-mounting the speakers. This is often done by high-end recording studios. Precision to 1/8" or better is required, but the result is zero early reflections off that wall, so no corresponding cues are superimposed atop the soundstage on the recording. Note that most "in-wall" speakers have reflective and/or diffractive features which betray the presence of the wall.
Another is to design the enclosure to effectively blend into the wall, so that acoustically it’s like a "bump" on the wall. The midrange/tweeter module of the (sadly discontinued) Snell Type A fits this description, and its downward-firing woofer was close enough to the wall and floor to interact benignly with both of them.
There is another technique for getting soundstage depth with against-the-wall placement which I use in some of my designs. They work better with some spacing, but still imo better than most without. If anyone is curious I’ll describe.
Duke