In the subject paper [Alku and Vilkman, J. Acoust. Soc. Am.98, 763–767 (1995); hence AV], AV describe the results of their research on the effect of bandwidth on estimated voice source parameters. They found that reducing the bandwidth (by low‐pass filtering the glottal flow signals) leads to a distortion of the estimated parameters. Although I do agree that low‐pass filtering influences the estimate of the voice source parameters, I do not agree with some of their conclusions, explanations, and recommendations. Furthermore, the method they used does not seem to be optimal for the purpose of their research. These matters are discussed in this Letter.