Isolation of sound between rooms is never absolute but a reasonable transmission loss is obtainable if some basic points are followed. Mechanical isolation between rooms must be maximized for the best result. Standing waves that occur in small rooms cause coloration to the sound and are controlled by means of various absorbers and diffusers. Monitors are located symmetrically about the center line of the room and should be flush mounted. Early reflections in the control room are controlled with absorption and room geometry, the aim being to create a reflection free zone at the primary listening position.
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