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Critical Listening Skills for Audio Professionals by F. Alton Everest

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Their effect on music and speech

TalkTech
In previous lessons, we have heard the effect of cutting off high frequencies and cutting off low frequencies and limiting the band by cutting off both lows and highs. In those tests, we always returned to the flat, wide-band condition as our reference point. This wide-band flat response is our ideal. However, there are things which introduce irregularities into the flat response. In this lesson, we shall again use the flat, wide-band response as our point of departure and critically observe the effects of introducing irregularities of known magnitude and at known frequency. This can be done simply by adjusting an equalizer. Here is our wide-band, flat response for reference:

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