Tech Notes: Qualis Audio Technote 5: Quantitative Assessment of Surround CompatibilityA completely new method of assessing downmix compatibility has been developed by Qualis Audio. It yields quantitative measures and eliminates the need for users to interpret graphical displays to assess program material. Its quantitative nature allows pass/fail limits tests to be applied significantly reducing the subjectivity previously involved in downmix compatibility assessment. This document summarizes the hazards in downmixing, prior methods of assessment and describes the new approach invented by Qualis Audio. Its practical implementation and the advantages are explained.
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