The finest acoustic performance is found in purpose-built reference high class listing rooms. These rooms are found in the headquarters of high-end audio manufacturers, some dealer showrooms, playback rooms for writers and product reviewers and some fortunate audiophiles. These rooms generally conform to the golden standard audiophile reference room referred to as 2C3D: 2 Channel, 3 Dimensional. 2C3D was coined by Bruce Brisson of MIT cables.
These rooms begin with healthy room dimensions that depend on the type of speaker intended for the room and designs include speaker position and listening position. Each speaker is set on a concrete pier with an independent foundation and not connected to the floors at all. The floors are not suspended joists but overly supported, multiple piers to eliminate sympathetic vibration and assembled with structural damping to eliminate sound vibration conduction. Walls and ceilings are semi-floating, converted into giant deep bass membrane bass traps using our Iso-Wall construction. Sometimes ASC proprietary sub bass soundproofing is included. Once the room is built correctly for use as a high end listening room, it is fitted with the appropriate acoustic complement.