Can I explain? The SPDIF standard for transmission is 75ohm. That means all devices & cables used for SPDIF should be 75ohm. What happens if 75ohm is not used? Just like any wave when it encounters an obstacle it will generate a back reflection & also cut down the amount of energy in the wave passing beyond the obstacle. The energy issue isn't such a big problem but the reflections are. Just as in a wave machine the reflections superimpose on top of the original wave & we no longer have a clean SPDIF signal (yes high speed signals are treated as waves in cables). This can cause jitter - it's that simple! That's why/how 50 ohm is worse!
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