A dataset of sound-source directivity measurements for four different sound sources that can be used in acoustic measurements. The loudspeakers included: Genelec 8030B studio monitor; Genelec 8331A studio monitor; 01 dB LS01 omnidirectional loudspeaker conforming with ISO 3382-1:2009 standard (OmniSource); Mixed-order spherical loudspeaker type 393 (information on design of the loudspeaker is found in the publication: https://www.researchgate.net/publication/333132335_Design_and_Control_of_Mixed-Order_Spherical_Loudspeaker_Arrays). NOTE: the orientation of the drivers is specified in the table below. Elevation (deg.) Azimuth (deg.) Driver # 0 0 15 0 -40 (320) 11 0 -80 (280) 10 0 -120 (240) 9 0 -160 (200) 8 0 40 7 0 80 6 0 120 5 0 160 4 -45 120 13 -45 0 12 -45 -120 (240) 14 45 -60 (300) 2 45 60 1 45 180 3 The directivity was measured in the anechoic chamber Lampio at the Acoustics Lab of Aalto University in Espoo, Finland. The measurement microphones were G.R.A.S. 46AF 1/2" free-field microphones and B&K 4191 1/2" free-field microphone. All the receivers were fixed on a custom-made measurement arc. The sound sources were placed ona turntable allowing for high angular resolution in the XY-plane. More information about the measurements is available in the paper: Anthony Gallien, Karolina Prawda, and Sebastian J. Schlecht, "Matching early reflections of simulated and measured RIRs by applying sound-source directivity filters", in Proc. AES ASR 2024, 22-26 Jan. 2024, Le Mans, France Directivity plots for all sound sources are available online: http://research.spa.aalto.fi/publications/papers/aes-asr24-recreate-RIRs/ The work leading to producing the dataset and related research was conducted as Anthony Gallien's intership project at Aalto University Acoustics Lab from May 22 -- August 18, 2023. How to read this dataset: The measurements of each sound-source are available as a Spatially Oriented Format for Acoustics (SOFA), AES69-2015 file or as a set of individual directivity measurements in .wav format included in a .zip file with the name of a respective sound source. The naming convention for Genelec studio loudspeakers and 01 dB omnidirectional loudspeaker is: Calibrated_IR_elevation_E_azimuth_A.wav The naming convention for the mixed-order loudspeaker is: Calibrated_IR_elevation_E_azimuth_A_driver_D.wav NOTE that directivity measurements for mixed-order loudspeaker and elevation above 0 degrees are missing due to a loudspeaker-related technical issue during the measurement! The azimuth and elevation angles are determined according to the scheme presented in the file azimuth_elevation.pdf. Where elevation is relative to XY-plane at the horizontal axis of the sound source and azimuth is relative to the vertical plane at the vertical axis of the loudspekaer. The elevation angles range from -80 degrees to 90 degrees in 10-degree steps. The azimuth angles range from 0 degrees to 359 degrees in 1-degree steps for Genelec loudspekers and omnidirectional sound source, and in 5-degree steps for the mixed-order loudspeakers. The azimuth angles increase clockwise relative to the axis of the loudspeaker (1 degree azimuth means 1 degree right of the loudspeaker axis, 359 degree azimuth means 1 degree left of the loudspeaker axis). The datset includes a total of 38 880 measurements (6 480 measurements for omnidirectional source and each of the Genelec loudspeakers, 19 440 measurements for the mixed-order loudspeaker).