Other than classical Spanish guitars, flamenco guitars are capable of projecting rapid beat sequences in pronounced clarity. This relates to what musicians call a fast guitar. This ask for fast attack but also for some kind of damping in between beats, which may follow each other densely by some ten milliseconds in a rasgueado. Temporal features are investigated across guitars of both types to understand whether the flamenco guitar differs from the classical guitar in these aspects. The full data set contains impulse responses for more than 60 valuable reference guitars. Attack and decay are extracted from bridge impulse responses and from playing open strings. Additionally, a simple measure represents the speed of sound development across the soundboard. This measure is derived from multi-point impulse responses taken along the soundboard. Populations of both types of guitars strongly overlap in these temporal maps and the physics seem to provide only part of the answer. Flamenco guitars tend to be faster in the treble range when monitored by means of specific temporal loudness. While there is only little done on modeling phase-dependent sound perception, auditory physiology may provide the other part of the answer.
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