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The cord that allows to conduct electricity and that is covered by a wrap composed of several layers is known as cable. Typically, it is manufactured with electrical conductors such as aluminum or the copper .

He coaxial cable , meanwhile, is a type of cable that is used to to transmit signals high frequency electricity . These cables have a pair of concentric conductors: the live driver or central (dedicated to transporting data) and the outer conductor , armor or mesh (which acts as a return of the current and ground reference). Between the two is the dielectric , an insulating layer.

Coaxial cables were developed in the 1930s and enjoyed great popularity until recently. Currently, however, the digitalization of the different transmissions and frequencies Higher than those used previously have caused these cables to be replaced by fiber optic cables, which have a more important bandwidth.

The structure of the coaxial cable consists of a nucleus developed with copper wire that is wrapped by an insulating element, some pieces of braided metal (to absorb the noise and protect the information) and an external cover made of plastic, Teflon or rubber, which has no conduction capacity.

Among the various types of coaxial cable (with different diameters and impedances), the most frequent are those manufactured with polyvinylchloride (better known as Pvc ) or with plenum (materials that resist fire).

Interurban telephone networks, Internet and cable television, the connection between the antenna and the television, and amateur radio devices often use coaxial cables.

The area where coaxial type cables are most commonly found is the digital audio. In this case, the connector resembles an RCA (the type of Connection used for analog audio and video, which consists of a white plug, a red one and a yellow one), although the information it carries is absolutely different. Compared to a normal audio cable, it is much thicker, since it uses the same type of Maya that is seen in traditional television antenna cables.

The digital coaxial transmits a signal electric, which runs through the copper wire that is inside, covered with aluminum foil to avoid interference. The first difference with respect to analog audio cables is the price; since the sound quality they offer is very superior, it is necessary to pay almost ten times more. This may tempt an inexperienced user to make a homemade alternative from a traditional RCA cable, committing a serious mistake.

Among the disadvantages of such a decision are the absence of isolation, which causes signal losses in very long cables, and a considerable decrease in the bandwidth. This would result in cut sound, since all the digital information coming from the device steadily In addition, interference from other electrical appliances would be perceived.

If one takes into account that the coaxial audio cables do not cost much money and that, assuming that the necessary equipment is possessed, they offer a considerably higher audio quality, the decision of not acquiring them is difficult to understand. It is important to understand that, as the type of information they transmit is digital, it can include both the two channels of the stereo sound and the six channels of the ambient sound (generally known as "surround"). In addition, as with video through HDMI or DVI, it is not necessary to spend large sums of money to find the best results, since (even in economic products) the digital data is always the same.

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