An unresolved question in loudspeaker design is what should be made invariant with frequency. The present paper shows that for faithful sound-field reproduction in a living room both the direct-field response and the reverberant-field response should be flat. This can be achieved for a specific relationship between loud-speaker directivity factor and room constant. Extension of the theory to stereophony is made difficult by an as yet unexplained dichotic phenomenon. However, subjective evaluation of reproduction quality is possible with a new type of listening test. On equalizing sound-reinforcement systems, it has been found that high-frequency rolloff is required for natural sound. This effect is consistent with the theory presented in this paper. In studying this phenomenon, earlier workers have been misled by the experimental procedure devised by R.B. Schulein. It will be shown that their data do not say anything about the real situation.
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