How can substandard cables affect the quality of video and sound?(Cable)

               Users spend thousands for the best AV equipment. However, proper cabling is crucial to get the best out of what your gizmos can off er.
               High-end home entertainment setups, which include the TV, DVD player, stereo system and game console, come with innumerable connectivity options. But, they aren't necessarily accompanied by the best cabling options and users tend to make do with bundled cables. Usually, the media output is inferior, hence spoiling the user experience.

                Primarily, digital connections such as S/PDIF, HDMI and DVI-D should be preferred to other standard options. This ensures that whatever signal is sent by the equipment is received by the display or playback device, thus providing lossless A/V quality.
                Digital standards such as S/PDIF and HDMI provide the actual digital signals, which deteriorate when sent via other cable standards. Below those two in terms of quality is the component connection (YUV); then comes S-video, and lastly, composite video (single yellow RCA plug). So if you’re using composite video, consider using HDMI, especially if your TV and DVD are compatible. SCART is actually just a plug which has 21 pins for transfer. It always depends on the combination of the player and the playback device to decide which signal has to be transferred and which of the transferred signals is actually to be used for the reproduction.