The central nervous system of the modern Hi-Fi system is the digital surround receiver. The internal digital/analogue converters are usually better than those of the devices providing sound. For that reason the sound signal from DVD and CD players or digital tuners should be digitally transmitted to the A/V receiver. This can only be done using the right cables.

Such as in-akustic's world premier, On/Off-202, the first twisted pair cable with a special return conductor. Or the On/Off-12, with a solid (DSS), silver-plated (CSP) inner conductor, and which received the judgement 'very good' (Stereoplay 02/2001).