BRIR of a real enclosed space. A, Photograph of the acoustically excited room (Old St. Stephanus, Gräfelfing, Germany) with the head-and-torso simulator. B, Spectrograms of the left and right BRIRs. Sound pressure level is color coded between −60 and 0 dB. C, Changes of the size of a virtual room with an equivalent reverberation time after it is compressed with factors of 0.7, 0.5, and 0.2, respectively. Bottom, Spectrograms of the left-ear room impulse response corresponding to the three compression factors. Color scale is identical to the second row.