This paper describes a commercially available system for stereo hi-fi use for equalising room and loudspeaker impulse responses across a listening area, using a chirp measurement and decimated digital equalizer implemented on a single DSP chip. Filter impulse response lengths of up to one second are achievable at low frequencies. Psychoachoustic requirements are discussed for subjectively satisfactory results, and naive strategies such as mean-square optimization or minimum-phase equalization are found to be inadequate.
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