@sls883 Out of curiosity, I called the Cable Company to inquire about impedance standards, as these are universally followed by industrial manufacturers. There are no exceptions—for example, 75 ohms for S/PDIF and 110 ohms for AES/EBU. These standards are regulated by the IEC, which governs the manufacturing requirements for both audio components and their associated cabling and terminations.
A knowledgeable gentleman kindly informed me that the information posted on the website—specifically that the Acoustic Zen MC2 is a true 110-ohm cable—is a mistake. It should be stated a true 75 ohm instead. He confirmed the impedance standards I mentioned earlier. Again, no exception.
He also added that while cable impedance is standardized, the terminal connectors used for coaxial cables are not always a perfect 75-ohm design. Small variations can exist—for example, a connector might measure 74 ohms—which could cause minor high-frequency roll-off. However, he confirmed that the connectors used on the MC2 are indeed true 75-ohm designs. This also clarifies the misinformation in the previous thread https://forum.audiogon.com/discussions/acoustic-zen-mc2-110-ohm