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The Excess Phase in Loudspeaker/Room Transfer Functions: Can It Be Ignored in Equalization Tasks?

The impulse response c[n] characterizing the system of a loudspeaker and a microphone placed in a closed room contains information on the electroacoustical properties of loudspeaker and microphone as well as the acoustical properties of the room. The corresponding transfer function C(z) offers information on the magnitude and phase of the system when regarded as a digital filter. A part of this phase, the excess phase, gives rise to problems when reaching for mathematically perfect equalization of the system. It is a fact however that phenomena which appear through analysis of C(z) might not be perceivable to the human ear. We have shown that, unfortunately, the excess phase contribution is audible in controlled listening tests. That is, it can not be neglected in the design of equalization systems.