Depends on what you're connecting - if you are connecting pre-amp outs to amplifier inputs, you would need to use regular RCA connection cords. The digital coax cable is used to connect a digital output from a CD player or maybe a satellite dish to a DAC, which might be a separate unit or an input on your preamp or integrated amp. I have several stand-alone DACs that have CD players connected to them with a digital coaxial cable and one preamp that has a built-in DAC that requires the coaxial cable connection. You can also use a Toslink optical cable if you have that type of output on your source device, but most people seem to feel the coax connection can give better sound.
The Monoprice digital coaxial cable does an excellent job of delivering the digital sound-stream from my CD player to my DAC.The connectors are high quality and give a good secure fit. The sheathing even has a nice appearance to it and the cable has enough flexibility to make installation a snap. It's a great bargain if you need a cable for this type of connection.
I put these in place of the HAVE Inc Flexgy cables I was using and was pleasantly surprised at the difference they made. Flexgy are 24 gauge, twisted pair, stranded vs. the Monolith's 18 gauge single solid core coax.
What I noticed almost immediately was tighter, deeper, bass and an increase in overall transparency. The difference was not night and day, but enough to be noticed without too much effort.
Even if these cables made no difference at all, they are still a very well made, inexpensive, cable that I would have no hesitation in buying again or recommending to anyone. My new "reference" in audio cables.