Question about BNC to RCA adapters?

It just makes it mechanically compatible. It won't help whatever degree of impedance discontinuity (mismatch) is presented by the RCA jack on the component, and it will most likely add an additional discontinuity of its own.

Regards,
-- Al

That's what I suspected. Thanks for your answer. Matt

What about the other way around? An RCA cable > BNC adapter > BNC input on the unit?
I am thinking of just getting one side of this digital cable terminated with BNC...