The new ATP provides a very flexible and cost-effective solution to easily create the interior acoustical environment desired by each WhisperRoom user. The primary purpose of the ATP is to alleviate the problem of parallel walls, which creates an acoustical issue commonly known as Standing Waves. The ATP consists of a series of angled deflector panels attached to the interior surface of two perpendicular walls within the WhisperRoom. Acoustical foam sheets (1′ x 2′) can be attached to several deflector panels to control mid to high frequencies. LENRD® Bass Traps (3), located in the common corner, control low frequencies. Open voids created behind each angled deflector panel, provide for soundwave entrapment. Other acoustical materials, such as cloth wrapped fiberglass, can be attached to the surface of deflector panels. Direction and pattern of deflector panels can, easily and quickly, be adjusted to accommodate user needs.