Introduction

The PS-550 is Accuphase’s sixth-generation Clean Power Supply, engineered to deliver rock-steady, ultra-low-noise AC to your high-end audio components. By comparing incoming mains to a precise reference waveform and actively correcting any imperfections, it transforms ordinary power into a virtually distortion-free sine wave—resulting in dramatically improved clarity, dynamics, and musical realism.

Design

Housed in a rigid, vibration-damped chassis, the PS-550 features a full-color, multi-function LCD that can display input/output waveforms, voltage, power, and distortion measurements. Large, high-efficiency toroidal transformers and massive filter capacitors handle demanding loads, while hydraulic dampers isolate the transport mechanism to prevent mechanical noise from reaching sensitive circuits.

Application

Installed between your mains outlet and audio system, the PS-550 regenerates pure AC for sources, preamps, amplifiers, and digital components alike. Whether used with SACD/CD transports, streamers, or analog front ends, it elevates every link in the chain—unmasking detail, deepening bass impact, and lowering the noise floor to reveal new layers of resolution.

Technology Overview

• Reference Waveform Generator
  Detects the zero-cross point of the incoming AC, then uses a multi-stage filter network to create an ideal sine-wave reference free of harmonics.
• Three-Stage Noise Elimination
  1. Line filter removes high-frequency interference from digital devices and routers.
  2. Shielded toroidal power transformer suppresses common-mode noise.
  3. Waveform correction amplifier actively shapes the output, reducing third-order harmonics by over 40 dB.
• Real-Time Display & Control
  Seven selectable LCD modes let you monitor input/output waveforms, voltage levels, power usage, and harmonic distortion at a glance.

Key Features

• Active waveform-shaping technology for < 0.08 % THD
• Multi-function LCD (output power, voltage, distortion, waveforms)
• Massive toroidal transformer and filter capacitors
• Six AC outlets (all high-current) for source and amplification gear
• Line filter and high-sensitivity protection circuitry
• Hydraulic damping to isolate mechanical drive noise
• Factory-set for 100 V, 120 V, or 230 V AC, 50/60 Hz

‍