With multi-channel systems, especially with WFS systems, the geometric calibration of the loudspeakers requires a high degree of precision in order to ensure the correct reproduction of the sound field. TDOAs (time differences of arrival) offer a way of determining the positions of loudspeakers electroacoustically by measuring the propagation times between loudspeakers and microphones.To optimize the electroacoustic TDOA method for the localization of planar loudspeaker arrays, a combination of theoretical analyses, systematic simulations and empirical experiments was performed. The results are compared to measurements with high-resolution 3D laser scans. The results show that the electroacoustic TDOA method can be used for the localization of loudspeakers in WFS systems with sufficient precision. As part of the research, the influence of the geometric arrangement of microphones and loudspeakers on the localization accuracy and which constellations are particularly suitable was also worked out.A measurement and simulation software and test results are introduced. Starting points for future investigations to increase the accuracy of the localization of the loudspeakers are presented, e.g. by using a larger number of microphones or other larger spatial setups.