Abstract
Schroeder diffusers of the quadratic-residue type in two dimensions were constructed. The size of a unit is 45 cm × 45 cm ¢ 60 cm and the prime number is 7. The wells were constructed as follows: 3 mm thick plywood for well walls, 6 mm thick plywood for the case of the unit and 30 mm thick chipboard for the well bottoms. The reverberant sound absorption coefficient was measured in a reverberation chamber using 48 (6 × 8) units. Their absorption coefficient was very large in the frequency range below the lower limit of the design frequency. Although the reason for this high absorption efficiency has not yet become clear, the data obtained experimentally are presented in this paper.
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