Accuphase PS-550 Power Supply

Accuphase PS-550 Clean Power Supply

A precision AC regenerator that reshapes ordinary household power into a near perfect sine wave before it ever reaches your system.

What the PS-550 Actually Does

Every audio component in your system depends on the electricity coming out of the wall, and that electricity is rarely clean. Household AC carries noise from dimmers, appliances, and nearby electronics, along with harmonic distortion baked in by the power grid itself. The Accuphase PS-550 sits between the wall and your gear and rebuilds that power from the ground up. It does not simply filter what comes in. It generates a new, ideal sine wave internally, compares your incoming power against it, and corrects the difference in real time. The result is power that reaches your amplifier, DAC, or preamplifier with total harmonic distortion of 0.08 percent or less, a meaningful improvement over typical household supply.

How the Waveform Actually Gets Rebuilt

Inside the PS-550, a reference waveform generator detects the zero cross point of the incoming AC and uses it to build a perfectly clean square wave. That square wave passes through a two stage bandpass filter and a six stage band elimination filter, which strips out harmonics and leaves a precise reference sine wave free of distortion. The unit then compares your home's actual incoming power against that reference and uses a waveform correction amplifier, built around a 10 parallel push pull output stage, to fill in what is missing and remove what does not belong. None of this involves converting the power to DC and back, which is part of why the PS-550 runs efficiently and does not introduce the high frequency noise that oscillator based designs can create.

Three Stages of Noise Elimination

The PS-550 cleans your power in three distinct steps before it ever reaches an output terminal. A line filter removes the high frequency noise generated by digital devices and switching power supplies elsewhere in your home. A large shielded toroidal transformer then eliminates common mode noise, the kind that piggybacks on both the hot and neutral lines at once. Finally, the waveform correction amplifier reshapes what remains into the clean output sine wave your equipment actually receives. Each stage targets a different category of electrical garbage, which is why the combined result measures so much cleaner than any single filtering approach could achieve on its own.

Reading the Front Panel

A front mounted display gives you four ways to look at what the PS-550 is doing in real time. You can view output power in volt amperes, input and output voltage side by side, input and output distortion as a percentage, or an actual waveform trace showing the input and output sine waves overlaid. This is not a gimmick. It lets you see exactly how rough your home's incoming power really is and confirm what the unit is correcting before it reaches your amplifier or source components. The display can also be switched off entirely if you would rather not have it lit during late night listening sessions.

Sizing the PS-550 to Your System

The PS-550 is rated for 400 VA of continuous output, and that number matters more than the 510 VA shown at the top of the front panel meter, which is simply the upper limit of the display itself rather than a usable continuous rating. Volt amperes and watts are not the same thing. A piece of audio equipment's VA draw typically runs 1.2 to 1.8 times its wattage rating, so the safest approach is to plug your gear into the PS-550, switch the display to the VOLT-AMPERE mode, and confirm your total connected load stays under 400 VA, particularly when amplifiers are pushed toward higher volume. Six AC output terminals on the rear panel give you room to connect several components at once, whether that is a DAC and a preamplifier or a full source chain feeding into a separate power amplifier on its own circuit.

Build Quality and Why It Runs Silent

The PS-550 cools itself entirely through natural convection, with no fan and no moving parts to generate mechanical noise. Two large filtering capacitors rated at 22,000 microfarads and 90 volts work alongside the shielded toroidal transformer to keep the power supply stage robust and the current delivery stable under load. The cabinet itself is finished with high gloss aluminum side panels and a champagne colored front, designed to sit comfortably in a rack alongside the rest of an Accuphase system or any other high end component.

Choosing Between the PS-550 and the Step-Up PS-1250

All Elite Audio also carries the Accuphase PS-1250, the model directly above the PS-550 in Accuphase's clean power lineup, priced at $17,575. The PS-1250 more than doubles the continuous output capacity to 900 VA and adds a dual balanced power amplifier design, which makes it the better choice for a system built around a full size integrated amplifier or separate power amplifier with real current demands. The PS-550 is the right fit for a single source component, a DAC and preamplifier pairing, or a turntable and phono stage, where the load stays well under 400 VA. If you are unsure which one your system actually needs, our team can walk through your equipment's power draw with you before you buy either one.

Key Specifications

Brand: Accuphase
Model: PS-550
Category: Clean Power Supply (AC power regenerator)
Version Sold: 120V AC, 60Hz, US configuration
Rated Output Capacity: 400 VA continuous
Rated Output Voltage: 120V AC ±1.5V
Rated Output Current: 3.4A
Output Frequency: 60Hz (matches input)
Output Waveform THD: 0.08% or less
Rated Input Voltage: 120V AC ±10%
No Load Power Consumption: 27W
Cooling: Natural air convection, no fan
Output Terminals: 6 AC outlets
Filtering: Dual 22,000 microfarad / 90V capacitors with shielded toroidal transformer
Display: Front LCD with 4 modes (output VA, input/output voltage, input/output distortion, input/output waveform)
Dimensions (W x H x D): 465mm x 181mm x 385mm (18.3 in x 7.2 in x 15.2 in)
Weight: 24.4 kg net (53.8 lbs); 31 kg in shipping carton (68.4 lbs)
Price: $10,975.00
Warranty: Manufacturer warranty serviced through the authorized US Accuphase distributor. Coverage terms are administered by the distributor rather than published directly by Accuphase. Contact All Elite Audio for the current term before purchase.

Why Buy From All Elite Audio

All Elite Audio is an authorized Accuphase dealer, which means every PS-550 we sell is backed by full manufacturer warranty coverage and genuine after sales support. Gray market and parallel imported Accuphase units, common from unauthorized online sellers, void that warranty entirely and often arrive configured for the wrong country's voltage. Our team can walk you through pairing the PS-550 correctly with your existing system, confirm your connected load fits within its 400 VA rating, and set up a demo in our Timonium showroom before you commit.

Call: 443-402-5055
Text: 443-402-5064
Visit: 1921 York Rd, Timonium, MD 21093

FAQ

What does the Accuphase PS-550 actually do for my system?
The PS-550 sits between your wall outlet and your audio equipment and rebuilds the AC power before it reaches anything else. It generates a clean internal reference sine wave, compares your home's actual power against it, and corrects the difference through a dedicated waveform correction amplifier. The result is output power with total harmonic distortion of 0.08 percent or less, well below what most homes deliver naturally. It does not amplify or process your audio signal in any way. It only conditions the electricity that your other components then use to do their job.

Does the PS-550 include a phono preamp or a cartridge?
No. The PS-550 is strictly a power conditioner and has nothing to do with phono signal processing. It contains no phono stage and ships without a cartridge of any kind. If you are setting up a turntable, you will need a separate phono preamplifier and cartridge in addition to the PS-550, and our team can help you choose components that pair well together.

How much continuous load can I actually put on this unit?
The PS-550 is rated for 400 VA of continuous output, and that is the number to plan around rather than the 510 VA shown at the top of the display meter, which is just the meter's display range. Switch the front panel to the VOLT-AMPERE mode once your gear is connected and confirm your total draw stays under 400 VA, especially when an amplifier is pushed toward higher volume. The display's LED will blink as a warning if you exceed that threshold. Staying within the rating protects both the PS-550 and whatever you have connected to it.

What is the difference between VA and watts, and why does it matter here?
Volt amperes account for both the real power a device uses and the reactive load it places on the circuit, while watts only measure real power. Most audio equipment draws somewhere between 1.2 and 1.8 times its wattage rating in VA, which means you cannot size a system purely off the wattage printed on a component's label. The PS-550's display lets you measure actual VA draw directly rather than estimating it. That direct measurement is the more reliable way to confirm your system fits comfortably within the unit's 400 VA continuous rating.

How does the PS-550 compare to the step-up PS-1250?
The PS-1250 is the next model up in Accuphase's clean power lineup and is priced at $17,575 against the PS-550's $10,975. It more than doubles the continuous output capacity to 900 VA and uses a dual balanced power amplifier design, which makes it better suited to systems built around a full size power amplifier with real current demands. The PS-550 is the right scale for a single source component, a DAC paired with a preamplifier, or a turntable and phono stage. If your system includes a power amplifier drawing significant current, the PS-1250 is worth a conversation before you decide.

Is there a model below the PS-550 I should consider instead?
Not currently. The PS-550 is the sixth generation of Accuphase's clean power supply line, succeeding the now discontinued PS-530, and it sits as the current entry point into Accuphase clean power rather than the middle of a wider active lineup. There is no smaller Accuphase model in production below it today. If your budget is tighter than the PS-550 allows, our team can talk through other power conditioning options we carry at different price points.

Does it work with both analog turntables and digital sources?
Yes, and it benefits both about equally. Digital sources like DACs and network streamers are sensitive to AC noise that can manifest as added jitter or a raised noise floor, and the PS-550's clean output reduces that sensitivity. Analog components like phono preamplifiers and line stages benefit from a quieter electrical background, which shows up as lower noise and better low level detail. The PS-550 does not treat one category differently from the other since it is simply delivering cleaner power to whatever is plugged into it.

What is the difference between the 120V and 230V versions?
Accuphase builds the PS-550 in two versions matched to different regional electrical standards, a 120V version for the US and a 230V version for export markets, and the two differ slightly in rated current, depth, and weight. All Elite Audio only stocks the 120V US version, which is the only one legal and properly supported for use in this country. Accuphase itself warns against parallel exported units sold outside their intended region, since they can present safety issues and are not eligible for manufacturer warranty service here.

What else do I need to get the PS-550 running in my system?
Very little. The PS-550 ships with its own AC power cord and simply needs a standard wall outlet that matches its rated input voltage. From there, you plug your source components, DAC, or preamplifier directly into its six rear output terminals. Many owners choose to pair it with a higher grade aftermarket power cable for a bit more refinement, and we carry several options if you want to explore that, but it is not required for the unit to function correctly.

Does the PS-550 require any maintenance?
Very little is needed over the life of the unit. Since it cools entirely through natural convection, keeping it in a ventilated spot with reasonable airflow around the cabinet and free of dust buildup is the main thing to watch for. There are no filters to replace and no internally serviceable parts intended for end users to access. If you ever notice a change in its display readings or behavior, reach out to our team rather than opening the case yourself.

What is the warranty on the Accuphase PS-550?
The PS-550 carries a manufacturer warranty administered through the authorized US Accuphase distributor rather than a fixed term published directly by Accuphase worldwide. Buying through an authorized dealer like All Elite Audio is what makes that coverage valid in the first place, since gray market or parallel imported units are explicitly excluded from warranty service. We can confirm the current term for you before you purchase so there are no surprises later. Reach out by phone or text and we will have that answer for you directly.

Where can I buy the Accuphase PS-550?
The Accuphase PS-550 is available now at All Elite Audio, your authorized Accuphase dealer in Maryland. You can call us at 443-402-5055, text us at 443-402-5064, or visit our showroom at 1921 York Rd, Timonium, MD 21093 to hear it in person before you buy. Our team can also help confirm it is correctly sized for your system ahead of time. We are happy to set up a demo alongside the rest of your gear so you can hear the difference for yourself.