ABSTRACT
In typical home listening rooms, home theaters and recording control rooms, the transition frequency is somewhere in the region of 200 to 300 Hz. More than 50 mm thickness is required to usefully attenuate reflections above the transition frequency in typical listening rooms. In monophonic days, the room mattered greatly because reflections within the room provided the only spatial setting for what was reproduced. The directivity of the loudspeakers is a factor, as is the reflectivity of the surfaces involved in the first lateral reflections, especially in recordings incorporating left or right hard-panned sounds. It is evident that the sounds arriving at the listener are dependent on the loudspeaker directivity patterns and the acoustical performance of the reflecting points on the room boundaries. Acoustical measurements showed significant differences in the reflected sound fields generated by the two loudspeakers at the listening location.
