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A new practical test method for quantification of frequency dependent vibration damping of car bodies by sound insulating layers was developed and tested. Flat sheet metal covered with a sound insulating layer is exposed to bending vibrations in a broad frequency range. When exited at constant velocity, the quotient of the global vibrational energy on the sheet and that of it's exitation point gives a figure for the influence of the insulation layer on the damping of the steel sheet.