In an audio reproduction system, the perceptual quality at a listener position is influenced by the acoustical and geometrical properties of the playback environment, as well as the electro-acoustical characteristics of the loudspeakers. In this paper, we provide an analysis of the room and loudspeaker effects on the spectral response using a room impulse response dataset measured on a dense 3D grid for a subwoofer and a full-range loudspeaker at multiple positions in a room with complex structures. In the first part, we compute the global power-spectral average Room Transfer Functions (RTFs) using all the measurement points across the room for all loudspeaker positions and compare them at selected listener positions with the local RTFs averaged over volumes ranging from the size of a human head to that of a large sofa. In the second part, we examine the effect of subsampling of the available points on RTF averaging. First, we compare the RTFs averaged over an increasing number of points that are randomly sampled from the 3D grid with the global average RTFs. Then, for the selected listener positions, we apply random and systematic subsampling to the points available within the defined volumes and compare the resulting average RTFs to the local averages initially computed using all the points.
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