The effect of phase rotation on the reproduced quality of an audio signal is well known. However, the effect of phase rotations in the responses of individual drivers on the amplitude response of a multi-way system is often misunderstood. The paper quantifies this effect and, in showing that it is similar in nature to the better understood problem of time alignment, demonstrates how similar remedies may be applied to both effects together. It also shows how lowering the low frequency cutoff of a loudspeaker system can reduce its group delay errors in-band.
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