Z-Systems rdp-1 // Preowned / Digital Preamplifier / EQ

The Z-Systems RDP-1 is one of those sleeper studio legends that found a cult following among audiophiles who know what real digital control sounds like. Designed by Z-Systems, this is a reference-grade digital processor built for mastering engineers, not marketing departments—and you can hear it instantly. The RDP-1 delivers ultra-precise digital volume control, input switching, and processing without smearing, flattening, or bleaching the music. The presentation is clean, dynamic, and shockingly transparent, with rock-solid imaging and zero digital nasties. It’s not flashy, it’s not trendy, and it doesn’t try to sound “analog”—it just gets out of the way and lets the source speak. For digital purists and system builders chasing absolute control with zero compromise, the RDP-1 is a serious, no-nonsense weapon.

*Includes original box, manual, and remote

• Verified all inputs and outputs
  RCA
  XLR
  Optical
• Verified operation of controls
• Verified remote control operation
• Unit has original box and packing materials

S/N: 04372

FACTORY SPECS

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 lbs