The RAM-20.493/K with Speaker adapter; 165mm; Volvo S60 shelf, Volvo S80 shelf is a audio component manufactured by Carmedia. It is an aftermarket upgrade for the Volvo S60 and Volvo S80 cars, replacing the original audio system. It has a built-in speaker adapter to allow for the mounting of a 165mm external speaker or subwoofer. It has a multi-channel amplifier that provides robust sound output at a high resolution. The unit also has an advanced sound system technology, which includes fully adjustable parameters for treble, bass, fader, and balance, as well as a selectable mono mode and a built-in low pass crossover. It also has a built-in power supply, allowing for a continuous power output without the need for an external power source. The unit also features multiple inputs, allowing for the connection of devices such as an MP3 player, CD player, or smartphone.