Golden Sound HDMI Cables are designed with carefully selected materials, precision machining, and strict quality control. Through years of research and innovation Golden was the world's first company to obtain US ATC version 1.4 Certification. Unlike many companies, Golden Sound does not utilize an amplifier element the HDMI cable connector. Adding an amplifier, it seriously affects the sound (the treble falters, the bass isn't low enough) and contrast quality deteriorates (white isn't white enough, black isn't black enough). Currently, Golden Sound HDMI cable wire conductors are connected with the best, high-precision processing technology allowing Golden Sound HDMI cable quality performance realistic, beautiful sound, while the frequency range is wider and more stable!