ABSTRACT
A study was conducted to better understand the perceived mid-to-high-frequency timbral and spatial changes in a sound field due to the proximity to loudspeakers of reflective, semi-rigid surface boundaries similar to those of passenger vehicles. For the purpose of the study, a simple structure was mocked up to represent the interior boundaries of an automotive vehicle. Adjustable and removable panels were used so the effects of different panel combinations and loudspeaker locations could be investigated. Objective parameter measurements and binaural recordings were made for each of the combinations. Subjective tests were then performed to study listener impressions and correlate the results to the objective measurements