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About Digital Coax Cable:
One of the most common type of digital audio connections is coaxial digital. A digital coaxial cable looks like an RCA cable, but it transmits digital data instead of analog signals. The digital coaxial cable is slightly thicker than a typical audio cable because it uses the same type of shielded coaxial cable you use to connect your television to your cable box. Visibly, a digital coaxial cable looks like a coaxial cable with RCA connectors on each end.
Digital coax transmits signals electrically. The electrical signal pulses through the copper wire at the heart of the coaxial cable. It's shielded from interference by an aluminum foil wrap. A single digital coaxial cable carries all available audio channels. You only need a single cable to carry right and left stereo signals, or the 5.1-channel surround sound signals.
Often times you will see connections for this type of digital cable on the backs of DVD and Blue Ray Players as well as the inputs on the back of home theatre receivers. Many people use this 75 Ohm cable as a Spdif cable to drive powered subwoofers. Installation is achieved by hiding the digital cables behind the wall with the use of RCA Wallplates
