Alpine's HDS-990 digital media player doesn't do a lot of things you'd expect from a traditional head unit, and that's okay. What it does do is deliver impeccable playback of high resolution (up to 24-bit sampling depth/192kHz frequency response) digital music files, turning your car's cockpit into something like a recording studio - just without those pesky hourly rates. Alpine utilizes some of the same technology found in their legendary F#1 Status system in the HDS-990 - you can hear for yourself just how well it reproduces sound, thanks to its high quality materials and fine craftsmanship. The HDS-990 include a dash-mounted commander unit, so you can use it in tandem with an existing radio in your car or as a replacement. Alpine designed its status system components for high-resolution audio playback. Their Status Series digital receiver, amp with digital signal processing, speaker, and subs were designed to work toghether and play your 24-bit/192kHz digial music streaming files with high-quality, studio-level purity and sonic fidelity. The HDS-990 consists of two parts: the "black box" source unit which contains the inputs and outputs, and a "commander unit" with built-in display which lets you control the action. The source unit fits in many traditional single-DIN (2" tall) dash openings, or you can plug it into your existing radio using RCA connections or 4-channel high-level inputs and install it in your dash or another out-of-the-way location. The Dash-Mounted commander unit offers a high-definition screen, six of Alpine's classic control buttons, and a rotary dial for making volume adjustments. The commander unit includes a case mount for a permanent installation on your dash. The HDS-990's built-in 4-channel amplifier offers 25 watts RMS per channel to power your speakers, so you can power your factory speaker system without adding an outbaord amp