Quality of signals depends on products
Various companies have come forward with their own products for carrying signals, both video and audio. When some of the products remained inexpensive, others were considerably costly. This happened due to the difference in the quality of the products, especially when experienced by customers, supplied by the manufacturers.
DVD player and TV retailers found monster cables as a better source of revenue. When the margin of the TVs and DVDs are low, that of the cables and related accessories is very high. This way, they provide good revenue for these retailers.
There is considerable difference in quality between the ordinary cables and monster cables. The inexpensive cables carry poor signal quality, especially when the signals are digital audio signals. Listeners could easily distinguish these signals due to the variation in quality. Hence a monster speaker cable can be identified from a normal cable pretty easily.
Marantz produces high quality audio products. They greatly influenced the production of audio products. They were one of the pioneers in the CD technology and have produced some high quality CD players. This helped them to reach the top of the ladder in the production of such audio products. They have even concentrated on high end products.