Reduce the reverberation time
The more hard, reflective surfaces (stone, concrete, parquet, glass, etc.) in an open space, the more the room will echo. A good clue here is the reverberation time, which can be heard by clapping.
Provide diffusion
From sound reflections on a single surface, which arrive concentrated and shortly after the direct sound of the listener, the ear can be irritated more than from a uniform Hall field with multiply reflected sound components.
Avoid echoes
Reflections that move back and forth between two parallel reflecting surfaces are harmful to the impression of spatiality.
Create symmetry and reduce sidewall reflections
For the quality of the stereo reproduction, it is important that the left and right boxes are placed in a similar acoustic environment.
Create space or cushioning behind the listener
Hearing places in front of a wall is acoustically unfavorable for several reasons: Here, not only the booming room resonances but also discrete reflections gather.
Wall, shelf and bass
The closer the speakers are to the wall behind them, the more the low bass is raised. At the same time, the dreaded room resonances are more stimulated when between box and back wall is only 90 centimeters or less space.
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