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Vehicle audio system performance is an important attribute for final customers. Usually the system performance is evaluated by subjective judgments and also some sort of objective measurements, as for example: reverberation time measurement of the internal cabin, frequency response and harmonic distortion. But all of these measurements are performed by the automaker at vehicle level - with audio system and speakers installed inside the vehicle cabin - for general quality inspections and definition of some spatial parameters of internal trim design. Loudspeaker performance evaluation usually requires great amount of investments due to the acoustic chamber requirements.