Even though a direct radiator loudspeaker mechanism produces a uniform acoustical output with respect to frequency the diffraction effects of the enclosure may introduce wide variations in the frequency response. To determine the diffraction effects, a small direct rdiator loudspeaker mechanism was designed and constructed to deliver uniform sound output with respect to frequency. This loudspeaker mechanism was mounted in twelve enclosures of different shapes and the frequency response characteristic was determined experimentally. The experimental results agree with the theoretically predicted performance in the cases where the performance can be determined by theoretical considerations. A cabinet has been developed which exhibits a smooth frequency response characteristic and still retains an exterior which is acceptable from the standpoint of appearance.
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