Damping factor is the ratio of the output impedance of an amplifier and connecting cables to the DC resistance of a voice coil, which means that long, high resistance speaker wires will reduce the damping factor.
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A damping factor of 20 or greater is considered adequate for live sound reinforcement systems, as the SPL of inertia-related driver movement is 26 dB less than signal level and won't be heard.
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Given the controversy that has long surrounded the use of feedback, some extend their distaste for negative feedback ( NFB ) amplifier designs ( and so a high damping factor ) as a mark of poor quality.
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It is a Coulomb potential multiplied by an exponential damping term, with the strength of the damping factor given by the magnitude of " k " 0, the Debye or Fermi-Thomas wave vector.
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And finally, passive crossovers ( made of relatively large inductors, capacitors, and resistors ) are between the amplifier and speaker drivers and also affect the damping factor, again in a way that varies with frequency.
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Large amounts of damping of the loudspeaker is not necessarily better, for example a mere 0.35 dB difference in real-life results between a high ( 100 ) and medium ( 20 ) Damping Factor.
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Conversely, the same iPod touch driving a pair of 120 ohm headphones would have a respectable damping factor of 17.1, and would most likely not benefit from the addition of a lower impedance headphone amplifier.
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For example, a 32 ? headphone driven by a headphone amp with a 32, whereas the same headphone driven with an iPod touch 3G ( 7 ? output impedance ) would have a damping factor of just 4.6.
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For example, metal structures ( e . g ., airplane fuselages, engine crankshafts ) have damping factors less than 0.05, while automotive suspensions are in the range of 0.2 & ndash; 0.3.
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This simple model can be refined with a damping factor " d " which reduces the discrepancy between the model and the human participant to 3.6 % when the disturbance " d " is set to maximum difficulty.
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