Z-systems RDP-1
the remote is a little glitchy,
Z-Systems rdp-1 digital preamplifier: Digital inputs: 2 AES/EBU, 3 S/PDIF (RCA), 1 optical (TosLink with ST-type glass optional). Digital outputs: 1 AES/EBU, 1 S/PDIF (RCA), 1 optical (TosLink with ST-type glass optional). 24-bit input/output. 32-bit DSP with internal 40-bit floating-point arithmetic, used for all gain and equalization. Dynamic range: >144dB. THD+N: better than -135dB. Number of memories/presets: 99. Gain control: from -95dB to +12dB.
Dimensions: 17" W by 4.5" H by 10" D. Weight: 14
Read more at http://www.stereophile.com/content/z-systems-rdp-1-digital-preamplifier-specifications#4xFcik8jfpKPDFKV.99
