Speaker Stands and “Vertical Mode Control”
Every modern speaker design takes into consideration the complex effects created by the face of the speaker that include diffusion, distortion and phasing of the sound. Given that every professional speaker design is optimized to account for these physics, the next challenge is to optimize the rest of environment that impacts your sound.
ASC has specially designed speaker stands that optimize the AttackWall System. The stands can be used on their own but the optimum effect begins with at least the “Starter System”.
The (Negative) Impact of “Phase Cancellation”
Speaker placement starts with nestling the speaker into a “Monitor Stack”, comprised of specially designed TubeTraps. As an example, if a typical monitor on a stand is located about halfway between the floor and the ceiling. The floor/ceiling bounce returns back to the monitor out of phase, this imposes a phase cancel effect on the speaker's efficiency,. Typically, the first cut is 74 hz for 8' ceilings, then, the engineer boosts 148 Hz in the mix unnecessarily (figure "Bad").
The Monitor Stack upsets the vertical symmetry in the room. The lower trap absorbs bass, the upper trap is short of the ceiling and vents bass. The combination eliminates the phase cancel effect and the engineer works in a linear environment (figure "Good").