Denon HEOS, SuperLink Networked Multi-Room PreamplifierCondition:* Used, Removed From Service In Working Condition On System Upgrade. As Pictured.Additional Notes:* Whole home multi-zone audio (4 HEOS zones)* Pre-amp outputs for each zone, including dedicated analogue, fiber optic and coaxial outputs* Amazon Alexa voice integration* Dual RJ-45 ethernet LAN ports* Stereo/mono selectable output* Only 1RU high; removable rack ears included* 3rd party controllable* Dolby digital/Dolby digital+ downmixing to stereoDenonHEOS SuperLink