The average of SPL vs. frequency curves at listener locations in home listening rooms has been shown to have a substantial trough in the middle of the bass range. Reflected impedance from the room boundaries causes a reduction in woofer loading (and thereby a loss of acoustic power output to the room) in the same frequency region, for conventional loudspeaker systems in normal positions in a room. Uniform power output vs. frequency can be obtained by appropriate design of the loudspeaker system and its proper placement with respect to the room boundaries. This paper reports the effect of these measures on the sound field as measured at typical listener locations in several listening rooms.
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