Acoustical reproduction in cars is different to acoustical reproduction in rooms or other larger environments. This is caused by the size of the car cabin, by surrounding materials as well as non-ideal loudspeaker enclosures, and reproduction positions. In order to achieve a well balanced sound system, for most sound system tuning engineers, acoustical measurements are essential in the process of designing and optimizing an audio system. This paper analyses and describes different methods of measuring the frequency-gain behavior of single or multiple loudspeakers. When measured at a single position, often dips and notches in the form of comb-filters can be observed in the frequency response. This work focuses on practical aspects: In which way is it possible to measure a frequency response that describes the sound at the listening area as correct as possible, how can we reduce comb-filter effects? In which way is a fast and adequate measurement possible? Results showed a significant reduction by movement of the measurement microphone. An evaluation by listening tests showed that frequency response averaging by microphone movements led not only to smoother magnitude responses but also to better sound experience through less equalization.
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