Accuphase PS-550 Clean Power Supply

Accuphase PS-550 Clean Power Supply with 400 VA Rated Output Capacity

The power supply delivers the energy your audio equipment uses for music playback. Accuphase’s Clean Power Supply components provide a power source with minimum noise and distortion by utilizing a ground breaking waveform shaping technology that compares the power supply’s waveform to a reference waveform, then supplements insufficiencies and removes any excess misshaping. The results of waveform shaping are then observable in a new waveform display. The PS-550 delivers impressive improvements in audio quality, making it an essential supplement to fine audio equipment.

Clean Output Waveforms

In a typical home the power supply waveforms are distorted and contain unwanted harmonics. When these harmonics find their way into the audio equipment, they interfere with the audio signals and degrade the sound quality. The output waveform from the PS-550 and its harmonics has third-order harmonics reduced from –40 dB to –80 dB. This is how the PS-550 significantly reduces harmonics in the output sine waves and minimize distortion.

Three Stages of Noise Elimination

The PS-550 features three stages of noise elimination. In the first stage, a line filter removes noise components from digital devices and other similar equipment. The second stage involves a shielded toroidal power transformer, which eliminates common mode noise. The third stage consists of a waveform correction amp, which uses waveform shaping to generate an extremely clean power supply.

The Waveform Shaping Process

The PS-550 creates an ideal waveform sine wave before a signal is received (reference waveform). It then produces a sine wave of the input waveform by comparing it to this reference waveform and compensating any insufficiencies while also removing any excess impurities.

Reference Waveform Generator

Shaping the ideal waveform requires a highly accurate reference waveform. The PS-550 detects the zero-cross point in the power supply to generate a square waveform, which is then sent through a two-stage band pass filter and a six-stage band elimination filter to generate a highly precise reference waveform free from harmonics.

Waveform Shaping to Achieve High Efficiency and Low Noise

Waveforms are shaped as pure AC with no conversion to DC, which helps improve efficiency. And because the PS-550 does not rely on oscillators, the risk of generating high-frequency noise has been eliminated.

Robust Power Supply Stage

The PS-550 features a strong power supply consisting of a large shielded toroidal power transformer and two large filtering capacitors (22,000 μF/90 V).

Elegant Appearance

The aluminium side panels are finished to a high gloss and perfectly complement the champagne-coloured front panel to create an exquisite look that will blend in seamlessly with any audio system.

Multiple Output Terminals

The PS-550 is equipped with six AC output terminals to accommodate numerous audio equipment components.

Our Review on the Accuphase PS-550 Clean Power Supply

The Accuphase PS-550 Clean Power Supply brings a quietly transformative touch to a high-end system, delivering that unmistakable sense of calm and clarity you only get when your gear is fed beautifully clean power. Its clever waveform-shaping tech compares the incoming AC to a pristine reference waveform, topping up what’s missing and trimming away any grimy distortions - something you can now even admire on its new waveform display. With three stages of noise elimination, dramatically reduced harmonics, and a robust transformer-and-capacitor combo keeping everything rock-solid, the PS-550 gives your components the kind of stable, low-noise environment they deserve. Add in its elegant champagne-and-aluminium finish and generous six-terminal output, and it feels less like an accessory and more like a quietly essential foundation for truly refined listening.