Both ends of the delay cable require matched impedances to avoid reflections.
2.
Matched impedance makes the noise common mode .-- talk ) 00 : 53, 2 November 2014 ( UTC)
3.
The matched impedance situation is encountered much more in non-audio-related situations, for example in RF circuits, where transmission line effects also dictate impedance matching.
4.
The matched impedances provide better high-frequency performance than an unmatched passive probe can achieve, but at the expense of the low 500-ohm load offered by the probe tip to the DUT . Parasitic capacitance at the probe tip is very low so, for very high-frequency signals, the Z 0 probe can offer "'lower "'loading than any hi-Z probe and even many active probes.
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