No, reflections can have any phase, so you can't possibly cancel them out with a fixed geometry. But given the 1/r^2 falloff, unless the reflections are from ve

No, reflections can have any phase, so you can't possibly cancel them out with a fixed geometry. But given the 1/r^2 falloff, unless the reflections are from very nearby, they will be a lot weaker than the direct path.