A method of determining an estimate (EST, EST1, EST2) of a Sound Pressure Level or Sound Exposure corresponding to sound produced in an acoustic environment by multiple loudspeakers of a sound system in response to an input signal to said sound system, the multiple loudspeakers excluding headphones and mobile phone transducers, the method comprising performing microphone measurements with said multiple loudspeakers in said acoustic environment during set-up and calibration of the sound system; approximating one or more system properties of said sound system based on said microphone measurements, and determining in real-time said estimate (EST, EST1, EST2) based on the input signal and said approximated one or more system properties of said sound system; characterized in that the method further comprises improving said determining in real-time said estimate (EST; EST1, EST2) of the Sound Pressure Level or Sound Exposure based on one or more from the list of: calculating an inter-channel correlation of one or more pairs of channels of said input signal being a multi-channel signal and using said calculated inter-channel correlation in said determining, in real-time, said estimate of a Sound Pressure Level or Sound Exposure; approximating a frequency response of each of the multiple loudspeakers in the acoustic environment and using said approximation of the frequency response in said determining, in real-time, said estimate of a Sound Pressure Level or Sound Exposure; approximating a transfer function between each pair of one of the multiple loudspeakers and a pre-determined listening-position (LP1, LP2) in said acoustic environment and using said approximation of the transfer function in said determining, in real-time, said estimate of a Sound Pressure Level or Sound Exposure; and approximating a reverberation characteristic of said acoustic environment and using said approximation of the reverberation characteristic in said determining, in real-time, said estimate of a Sound Pressure Level or Sound Exposure. the method comprising performing microphone measurements with said multiple loudspeakers in said acoustic environment during set-up and calibration of the sound system; approximating one or more system properties of said sound system based on said microphone measurements, and determining in real-time said estimate (EST, EST1, EST2) based on the input signal and said approximated one or more system properties of said sound system; characterized in that the method further comprises improving said determining in real-time said estimate (EST; EST1, EST2) of the Sound Pressure Level or Sound Exposure based on one or more from the list of: calculating an inter-channel correlation of one or more pairs of channels of said input signal being a multi-channel signal and using said calculated inter-channel correlation in said determining, in real-time, said estimate of a Sound Pressure Level or Sound Exposure; approximating a frequency response of each of the multiple loudspeakers in the acoustic environment and using said approximation of the frequency response in said determining, in real-time, said estimate of a Sound Pressure Level or Sound Exposure; approximating a transfer function between each pair of one of the multiple loudspeakers and a pre-determined listening-position (LP1, LP2) in said acoustic environment and using said approximation of the transfer function in said determining, in real-time, said estimate of a Sound Pressure Level or Sound Exposure; and approximating a reverberation characteristic of said acoustic environment and using said approximation of the reverberation characteristic in said determining, in real-time, said estimate of a Sound Pressure Level or Sound Exposure. calculating an inter-channel correlation of one or more pairs of channels of said input signal being a multi-channel signal and using said calculated inter-channel correlation in said determining, in real-time, said estimate of a Sound Pressure Level or Sound Exposure; approximating a frequency response of each of the multiple loudspeakers in the acoustic environment and using said approximation of the frequency response in said determining, in real-time, said estimate of a Sound Pressure Level or Sound Exposure; approximating a transfer function between each pair of one of the multiple loudspeakers and a pre-determined listening-position (LP1, LP2) in said acoustic environment and using said approximation of the transfer function in said determining, in real-time, said estimate of a Sound Pressure Level or Sound Exposure; and approximating a reverberation characteristic of said acoustic environment and using said approximation of the reverberation characteristic in said determining, in real-time, said estimate of a Sound Pressure Level or Sound Exposure.