Hybrid measurement method in room acoustics using dodecahedron speakers and a subwoofer

A dodecahedron speaker is usually utilized for measurement in room acoustics under the hypothesis of omni directional point source. But generally speakers used for a dodecahedron speaker cannot playback low‐frequency sound such as under 100 Hz, which is important especially for auralization, while the one constructed of units with large diameter to support low‐frequency sounds cannot be considered as an omni‐directional speaker in high frequencies. To meet these requirements, a hybrid system combining a dodecahedron speaker and a subwoofer has been developed and actually used for measurements of impulse responses in acoustical design of concert halls. The summary of this method will be presented. The feasibility of this method will be also discussed while evaluating the measurement results in concert halls by changing measurement conditions such as speaker locations and comparing these results with those of conventional methods.