The report summarizes four statistical studies conducted by a leading audio speaker manufacturer. During a three month period, the author served as a consultant to the company. There, he was involved with each of the four studies to varying degrees. Statistical topics discussed in this report include experimental design, data collection, analysis of variance, analysis of covariance, pairwise comparisons of proportions, aliasing structures, confounding patterns, testing for significance, and non-parametric methods of analysis.