Pro-Ject Accu Box S2 Battery Power Supply - Silver

Pro-Ject Accu Box S2 Battery Power Supply – Silver

Take your hi-fi setup a step further with the Pro-Ject Accu Box S2 Battery Power Supply, a dedicated battery-powered upgrade designed for listeners who want cleaner power and better analogue performance. Built to work in perfect harmony with selected Pro-Ject phono stages, DACs and preamps, the Accu Box S2 helps unlock more detail, better separation and a more natural soundstage from your system.

By replacing a standard mains-powered supply with a clean battery-driven source, it reduces unwanted electrical noise and gives your audio components a more stable foundation to perform at their best.

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Cleaner Power for Better Analogue Sound

Power quality plays a major role in audio performance, especially with sensitive analogue components such as phono preamps. The Accu Box S2 is designed as a non-switching battery power supply, delivering pure, stable current without the electrical interference often associated with conventional switching power supplies.

The result is an audible improvement in overall clarity, helping music sound cleaner, more focused and more refined.

Whether you're listening to vinyl, digital files or streamed music, the difference can be heard in quieter backgrounds, improved detail retrieval and smoother presentation.

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Improves Space, Separation and Imaging

One of the most noticeable upgrades when using the Accu Box S2 is the improvement in stereo imaging and instrument placement.

By feeding your audio component with cleaner energy, the soundstage feels wider and more open, with instruments and vocals occupying their own space more naturally. This creates a more organised and realistic listening experience, especially with detailed recordings.

Bass response can also feel tighter and better controlled, while midrange and treble gain extra transparency.

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High-Quality Battery Technology

Inside the Accu Box S2 are five rechargeable Li-Pol battery cells with a capacity of 2.6Ah, carefully chosen for reliable and consistent performance.

Battery operation isolates connected equipment from mains interference during playback, allowing sensitive circuitry to work in cleaner electrical conditions.

This battery-based approach is especially beneficial for phono stages, where even small amounts of power noise can affect sound quality.

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Built-In Protection for Long-Term Reliability

To help protect both the battery and connected equipment, the Accu Box S2 includes multiple protection systems:

• Over-charge protection to prevent battery stress
• Over-discharge protection for healthier battery life
• Over-current protection for safe operation
• Surge protection for improved component safety

These built-in safeguards help ensure reliable long-term performance and maintain battery health over time.

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Advanced Transformer Design for Stable Performance

The internal design uses an audio-grade toroidal transformer, chosen for its low mechanical hum and efficient power delivery.

Combined with copper foil shielding, the transformer helps reduce electromagnetic interference, keeping the power path cleaner and more stable.

A soft start system also prevents sudden current surges during power-up, reducing stress on internal components and connected devices.

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Precision Voltage Regulation

The Accu Box S2 uses carefully regulated secondary voltage rectification to maintain a stable and accurate output.

This consistent power delivery helps connected devices perform with greater precision, reducing fluctuations that could affect sound quality.

With 10,000 µF filtration capacity per output and low ESR capacitors, the power remains smooth and highly filtered for improved audio stability.

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USB Power Output for Added Flexibility

In addition to powering compatible Pro-Ject audio products, the Accu Box S2 also features a 5V USB-A output, making it useful for powering selected DACs and digital components.

This adds extra flexibility, allowing you to cleanly power more than just phono stages.

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Wide Compatibility Across Pro-Ject Ranges

The Accu Box S2 is compatible with a broad range of Pro-Ject products across the S-Line, E-Line and DS-Line, including popular models like:

S-Line: Stream Box S2, Stream Box S2 Ultra, BT Box S2, Pre Box S2 Digital, Pre Box S2 Analogue, DAC Box S2 + Head Box S2 Tube Box S2, Head Box S2 Digital, Phono Box S2, Phono Box S2 Ultra, Phono Box S3 B, Vinyl NRS Box S3

E-Line: Optical Box E, Phono Phono Box E, Phono Box E BT, Record Box E

DS-Line: Phono Box DS2, Phono Box DS2 USB, Tube Box DS2, DAC Box DS2 ultra, Pre Box DS2 Digital, Head Box DS2 B, Pre Box DS2 Analogue, , Tube Box DS3 B, Phono Box DS3 B, CD Box DS3

This makes it a valuable upgrade for many Pro-Ject owners looking to improve system performance.

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Key Features

• High-end battery-powered power supply for cleaner audio performance
• Non-switching power design for reduced electrical noise
• Rechargeable Li-Pol battery system (2.6Ah)
• Audio-grade toroidal transformer
• Copper foil transformer shielding
• Soft start system for safer power-up
• Precision voltage regulation
• High filtration capacity (10,000 µF per output)
• Low ESR capacitors for stable performance
• Surge protection and battery protection systems
• 5V USB-A output for compatible DACs and accessories
• Designed for selected Pro-Ject phono stages, DACs and preamps

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A Serious Upgrade for Serious Listening

For anyone looking to get more from their Pro-Ject system, the Accu Box S2 offers a practical and effective way to improve power quality. Cleaner power means cleaner sound—and with better detail, stronger imaging and quieter backgrounds, it’s an upgrade that can make a real difference to your listening experience.

Technical Specifications

Outputs	1 x 18V/1A (2.5mm)   1 x 5V/1A (USB A)
Power Supply (Charger)	21V
Dimensions W x H x D	103 x 37 x 106mm
Weight	545g (without psu)

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