B-Stock, Solid State Logic Alpha-Link MX 16-4, MADI-Analog Converter, 64-Channels, 16 analog Inputs ans 4 analoge Outputs (balanced), AD/DA-Converter: 24-Bit/44.1 up to 96 kHz, Switchable reference level with a range of settings between +24dB and +14dB, Cascade up to 4 Units, Connections: 25-pin Sub-D for analog I/O, MADI In/Out, USB, BNC Word Clock I/O, Dimensions: 19", 1U, Weight: 2.8 kg, B-Stock with full warranty, may have slight traces of use