Denon HEOS Drive Multi Zone CI Pre-Amplifier with 4 HEOS Zones. Provides preamplifier output for each zone (1 pre-out shared with subwoofer). 3rd party control compatible with Hi-Res Audio Streaming. Includes 4 x 12V trigger outputs, fiber optic and digital coax outputs per zone, Dolby Digital decoding, 4 USB inputs, 4 x line-in, and 2 Ethernet inputs.