Because station wagons have a greater volume than sedan vehicles, low-frequency acoustic effects (‘‘humming’’) very often occur in the frequency range between 30 and 50 Hz. This is not only unpleasant, but can lead to physiological changes in the driver due to specific properties of the acoustic signals. The mechanisms may be very varied: Excitation frequencies can be produced by the powertrain, exhaust system, or wheel suspension and are transmitted via the mounting points. Resonances in the regarded frequency range may well be present along these transmission paths. The spectral components thus arriving at the structure are radiated into the car interior via various ‘‘loudspeakers,’’ such as floor panels, roofs, or doors. Moreover, for particular frequencies some loudspeakers may show special resonances or the volume of the vehicle interior results in amplification. During field trials, excitation mechanisms and transmission paths were investigated using the combination of Artificial Head and multichannel measurement technology that allows subjective evaluation of various models. Playback of the Artificial Head signals, however, is not only via headphones, but via a special ‘‘sound car’’ which also creates low-frequency excitation of airborne and structure-borne noise. This enables a connection to be made between the frequencies at the driver’s ear giving cause for complaint and the various excitation points. Moreover, the use of a two-dimensional laser vibrometer enables a connection to be made between vibrating structures and the annoying sound components a driver is hearing.