Hi Klaus, I tried my headphone amplifier with 0.06 ohm output impedance when loaded with 10m of Tasker C121 cable once with no termination (open end) and secondly with the far end terminated by 50 ohm. I was measuring the 200 kHz square response at the headphone amp output, i.e. the cable input. There was nothing special happening, only that in case of the open cable there is a predictable reflection on the rising edge and some other well damped reflections. The amp has no special anti-RF elements at its output, only it was thoroughly tested with any imaginable load to ensure stability. Yes we would see reflections (in case of the open end cable) with higher amplitude if the amp was even faster.
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Tasker C121 10m, open end, cable input. Cable driven from headamp with 0.06 output impedance.
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Tasker C121 10m, 50 ohm terminated end, cable input. Cable driven from headamp with 0.06 output impedance.