Tolerances are attached to any type of measurement, and acoustical measurements are typically associated with relatively large tolerances. Despite this, measurement results are often quoted to a high degree of precision and test limits are regularly set without consideration of the measurement tolerances involved. Quantifying measurement tolerances in manufacturing in general is well documented; however the literature fails to describe the application of suitable analysis methods to the field of acoustical measurements. The paper presents the consequences of the presence of measurement tolerances in classifying parts and also describes the shortfalls of the Gauge R&R study. How to quantify a capable measurement system is described including a simple method for quantifying acoustical measurement tolerances. This is particularly relevant in quality assurance in loudspeaker production and relates strongly to the definition of test limits and loudspeaker specifications in the supply chain.
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