Abstract
In order to assess the subjective impact of loudspeaker system response errors it is necessary to consider the following: the kinds of input signal used, how the loudspeaker modifies such signals, and the subjective importance of such modifications. This paper considers how loudspeakers reproduce complex harmonic tones, of which most continuous music signals are typical. From the amplitude of the frequency response three-dimensional graphs are generated of amplitude against fundamental frequency with harmonic number/group as the second horizontal axis. A cross-section of the surface at a given fundamental frequency shows the spectral envelope that the loudspeaker imparts on the complex tone. For a given fundamental frequency the amplitude response errors at that frequency and its harmonics are quantified by a ‘sum function’ which gives a measure of the accuracy with which that complex tone will be reproduced.
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