The BNC connector is the industry standard, being the only true 75 ohm connector. The impedance of the interconnecting wire ( including length ) , the requirement of the termination of the involved components, and the impedance of the connector itself, all effect the end result. No easy answer in absolute terms, except to say that if the two pieces involved required a TRUE 75 ohm termination, and the cable was a true 75 ohm cable, the BNC connector would not alter the balance. If any piece in the chain is above or below the 75 ohms, the connector could be "off" in the opposite direction, and "correct" the termination. To further complicate things, the quality of the connector and cable are almost as important to sound as maintaining the 75 ohms. Like most things in high end, you should audition several good quality cables and listen to the effect on your components. The only head start could be provided by the factory, who could tell you how important the termination capacitance is for your two pieces of equipment. If they say that your pieces are designed to work, using the supplied adapter, you are set. If they say that the 75 oms needs to be maintained, and the adaptor is a compromise, you should get a run that is terminated correct from the beginning, using the BNC standard.
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