When using full-width recorded calibration test tapes for multitrack reproducers, there are a number of long-wavelength response factors which cause doubts about the real shape of the response factors at low frequencies. The effects responsible for these deviations are discussed. They are measured by an empirical procedure using a special head which erases the guard bands from a full-width recording so that a direct comparison becomes possible between the full-track recording and the multitrack recording.
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