This paper gives an account of work carried out to assess the effects of metallised film polypropylene crossover capacitors on key sonic attributes of reproduced sound. The main findings were that capacitors used in crossover circuitry can exhibit mechanical resonance, and that maximizing the listener’s control over the listening situation and minimizing stress to the listener were necessary to obtain meaningful subjective test results. The listening test methodology employed in this study evolved from initial ABX type tests with set program material to the final A/B tests where trained test subjects used program material that they were familiar with. The capacitors under investigation were found to be mechanically resonant within the audio frequency band, and results obtained from subjective listening tests have shown this to have a measurable effect on audio delivery. JO - Journal of the Audio Engineering SocietyĪB - This paper gives an account of work carried out to assess the effects of metallised film polypropylene crossover capacitors on key sonic attributes of reproduced sound. The main findings were that capacitors used in crossover circuitry can exhibit mechanical resonance, and that maximizing the listener’s control over the listening situation and minimizing stress to the listener were necessary to obtain meaningful subjective test paul and duncan, philip and williams, nigel}, doi:Ībstract: This paper gives an account of work carried out to assess the effects of metallised film polypropylene crossover capacitors on key sonic attributes of reproduced sound. Once the slope is zero, then the current is zero, and we call that DC.P. I think the important thing is that current flows through a capacitor when there is a nonzero slope on the voltage (back to the fundamental equations). I agree it's technically AC, but my circles will typically call it an impulse, or ramp, or integrator, or whatever description fits the context of the circuit. If you get into other waveforms like Edgar is describing, then I don't think it's helpful to call it AC or DC. The AC level just tells you how far your signal deviates from the average level. That's why I think it's better to think of AC as alternating slope, and DC as the average level over the period of interest. Which isn't true for circuits (like a power supply) that exhibit that behavior. And if you want extreme technicality, then you have to require the circuit to be perfectly linear for Forier or Laplace transforms to be meaningful. Technically that's true in the math, but engineers don't typically call that AC. Sliding your curve up and down changes the average value, but it doesn't change the slope that is constantly changing.Įdgar added a caveat where you have a signal that rises once and then flattens out, and calls that AC. The "alternating" aspect is the slope of the line changing between positive and negative (rising and falling edges). It just requires the slope of the line to be nonzero. The mathematical definition of AC doesn't require a zero crossing. However, if you change the signal to switch from +0V to +2V, is it still AC? I think, with a series capacitor, current will flow the exact same way in both circuits?Īh, totally understand the confusion.
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