This qualitative study investigates what mastering engineers think of linear phase responses in equalizers; how, when and why they would use it or not. Four engineers, working part time or full time with mastering, were interviewed in order to gain information about their thoughts and opinions on the subject. Meaning condensation was used to analyze the interviews. Results showed usage of and opinions on linear phase equalizers varied among the engineers. Some special areas suitable for linear phase equalization were brought up. Pre-ringing seemed to be an artifact that made two of the engineers avoid linear phase equalizing for most of their work. Readers might get some understanding of a linear phase response in filters and its applications in different mastering situations.