Method for calibrating an audio reproduction system (100, 200) with a number of linearly arranged speaker devices (101, 102, 103, 104, 105, 106) for reproducing surround sound signals, the method comprising: emitting (S1, S11) test signals (108, 208), each test signal (108, 208) being emitted via a single one of the speaker devices (101, 102, 103, 104, 105, 106), receiving (S2, S12) responses (109, 110, 111, 112, 113, 209, 210, 211, 212, 213) to the test signals (108, 208) via the remaining speaker devices (101, 102, 103,104, 105, 106) that are not used for emitting the respective test signal (108, 208), and determining (S3, S13) calibration parameters (114, 214) for the audio reproduction system (100, 200) based on the received responses (109, 110, 111, 112, 113, 209, 210, 211, 212, 213), characterized in that the determined calibration parameters (114, 214) comprise a room obstacle level value that indicates the level of filling of surroundings of the audio reproduction system (100, 200) with obstacles, and comprising determining a frequency shift of the received responses (109, 110, 111, 112, 113, 209, 210, 211, 212, 213) in relation to the respective test signal (108, 208), and comprising determining a change of the amplitude, especially the peak amplitude and/or the average amplitude, of the received responses (109, 110, 111, 112, 113, 209, 210, 211, 212, 213) in relation to the respective test signal (108, 208), and comprising determining a distortion level of the received responses (109, 110, 111, 112, 113, 209, 210, 211, 212, 213) in relation to the respective test signal (108, 208), normalizing the determined frequency shift and the determined change of the amplitude and the determined distortion level, and comprising calculating a metric value based on the normalized determined frequency shift and the normalized determined change of the amplitude and the normalized determined distortion level, wherein the room obstacle level value is determined based on the metric value, wherein a threshold value regarding the metric value is provided for every value of the room obstacle level value. emitting (S1, S11) test signals (108, 208), each test signal (108, 208) being emitted via a single one of the speaker devices (101, 102, 103, 104, 105, 106), receiving (S2, S12) responses (109, 110, 111, 112, 113, 209, 210, 211, 212, 213) to the test signals (108, 208) via the remaining speaker devices (101, 102, 103,104, 105, 106) that are not used for emitting the respective test signal (108, 208), and determining (S3, S13) calibration parameters (114, 214) for the audio reproduction system (100, 200) based on the received responses (109, 110, 111, 112, 113, 209, 210, 211, 212, 213), characterized in that the determined calibration parameters (114, 214) comprise a room obstacle level value that indicates the level of filling of surroundings of the audio reproduction system (100, 200) with obstacles, and comprising determining a frequency shift of the received responses (109, 110, 111, 112, 113, 209, 210, 211, 212, 213) in relation to the respective test signal (108, 208), and comprising determining a change of the amplitude, especially the peak amplitude and/or the average amplitude, of the received responses (109, 110, 111, 112, 113, 209, 210, 211, 212, 213) in relation to the respective test signal (108, 208), and comprising determining a distortion level of the received responses (109, 110, 111, 112, 113, 209, 210, 211, 212, 213) in relation to the respective test signal (108, 208), normalizing the determined frequency shift and the determined change of the amplitude and the determined distortion level, and comprising calculating a metric value based on the normalized determined frequency shift and the normalized determined change of the amplitude and the normalized determined distortion level, wherein the room obstacle level value is determined based on the metric value, wherein a threshold value regarding the metric value is provided for every value of the room obstacle level value.