Room Acoustics Concept of the WellenFeld H 104
- Frequency-dependent reverberation time just before and after the room acoustic costumization
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Concerning the room acoustics design of the hall,
the requirements for a WFS reproduction room had to comply with those
for a conventional lecture hall. In addition to the avoidance of room
acoustic interferences (i.e., the suppression of flutter or back wall
reflection echoes), the reverberation time and reflection control had
to be taken into consideration. In a reproduction room for WFS
technologies, the audibility of physical space should not interfere
with the synthesized sound field. Specifically for WellenFeld
H104, the reverberation and room reflections should not adversely
affect the sound field synthesis. By contrast, in a conventional
auditorium, physical space plays the role of promoting spoken voice
transmission and, thus, speech intelligibility.
According to those premises, the following planning objectives were defined:
- A target reverberation time of 0.95 s (in the state of 50% of seats being occupied) with a balanced frequency response. This represents a practicable compromise between both usage scenarios of the WFS auditorium.
- Prevention of room-specific early reflections, as they negatively affect the WFS usage outweighing their advantages for the (electroacoustically reinforced) auditorium use. Lateral reflections are thereby prevented by specifically arranged absorbing surfaces, unfavourable reflections from the floor and ceiling are avoided by the horizontally focused directional characteristic of the WFS speakers.
According to the
purposes of this planning concept, the reverberation time could be
reduced at values of ca. 1s, via reprocessing of the seats and by
installing absorber material on parts of the walls, especially in the
vicinity of the speakers.