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This lecture introduces the concept of electroacoustic absorbers for room modal equalization, focusing on improving the listening experience at low frequencies. The instructor discusses correction strategies, control design, optimization, and performance evaluation of these absorbers, highlighting the use of passive and active means. Various techniques such as active absorption and shunt-based equalization are explored, along with the design considerations and performance indicators. The lecture concludes with a discussion on preliminary experiments and the potential of sensorless electroacoustic absorbers in room acoustics.