High-speed measurement of loudspeaker nonlinearity is important to achieving quality testing during manufacturing. Rather than just focusing on a single pass–fail criterion, this study explores how measurements at the loudspeakers terminals can provide diagnostic information about the nonlinearity in the motor and suspension systems. For example, a single valued parameter of voice-coil offset can be derived with signal durations of less than 3 seconds. Using this information as feedback in process control can reduce the rejection rate and increase production yield.
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