Denons DN-C550R has both a CD Playback drive and a CD-R/RW play and record drive, housed in a single unit, to provide you with a variety of recording and playback options either independently or in combination. Features: Accepts CD-R/CD-RW data or audio blank media. Ignores SCMS. 1X or 2X Dubbing Speed. 4-way recording option. Optimum Power Calibration for Recording. HDCD dubbing compatible. CD Text & Titling compatible. Synchronized Recording. 24-bit A/D conversion. 24-bit Analog Devices D/A converters. Auto digital sampling frequency converter (32 kHz, 48 kHz digital inputs converted to 44.1 kHz CD sampling frequency). Drive 1: CD & HDCD playback. Drive 2: CD-R/CD-RW Recorder; CD playback. Balanced XLR input. Unbalanced, mixed RCA output. Independent RCA outputs (each drive). 2 digital inputs (optical + coaxial). 4 digital outputs (optical + coaxial). Dual Playback Mode (both drives play at the same time). Relay Playback Mode. Mixed Playback Mode. IR remote included. 2RU rack spaces.