Pro-Ject Accu Box S2 Battery Power Supply - Black

Pro-Ject Accu Box S2 Battery Power Supply – Black

What You Need to Know

Battery Power: The Quietest Power There Is

Household AC lines carry noise, and noise ends up in your music—especially through sensitive phono electronics. The Pro-Ject Accu Box S2 solves the problem at the source: a rechargeable 2,600mAh lithium battery pack delivers pure, silent DC with complete isolation from the mains during playback.

The result on compatible Pro-Ject gear is a more homogeneous, spacious sound with better separation and imaging—an overall “cleaned-up,” relaxed presentation.

Smart Charging, Simple Operation

A front-panel button switches the outputs on and off; the included 21V charger tops up the battery in about 3 hours with outputs disabled. Let it run low and charging starts automatically below 10%, while built-in protection guards against over-charge, over-discharge, and over-current. Two outputs are provided: 18V DC for Box Design electronics and a 5V USB port for USB-powered components.

One Battery Supply for Nearly Every Pro-Ject Box

The Accu Box S2 powers Pro-Ject’s S-Line, E-Line, and DS-Line electronics—phono stages, DACs, headphone amps, streamers, and more (full list below). Pro-Ject turntables can also run from it using the optional Connect-It 18V/15V adapter cable, sold separately. Choose silver or black to match your Box Design stack.

Features & Specifications

2,600mAh Rechargeable Lithium Battery
Mains-isolated playback with full charge/discharge protection.

18V DC and 5V USB Outputs
Powers Box Design electronics and USB-powered components.

3-Hour Charging with Auto-Start
Charges automatically when the battery falls below 10%.

Silver or Black Aluminum Case
Matches every Pro-Ject Box Design component.

Specifications

•          Type: Rechargeable Battery Power Supply

•          Battery: 2,600mAh Lithium (5 cells) with Over-Charge/Discharge/Current Protection

•          Outputs: 18V DC / 1A (2.5mm); 5V / 1A USB

•          Charger Input: 21V DC (charger included)

•          Charging Time: Approx. 3 Hours (outputs disabled)

•          Dimensions: 4.0“W x 1.4”H x 4.2"D

•          Weight: 1.2 lbs

•          Finish: Silver or Black

Compatibility

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

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

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

•          Pro-Ject Turntables: Via Optional Connect-It 18V/15V 2.5-2.1mm Cable (sold separately)

Frequently Asked Questions

Will it power my Pro-Ject turntable?
Yes—most Pro-Ject turntables use a 15V input, so you’ll need the optional Connect-It 18V/15V adapter cable (sold separately) to connect them to the Accu Box S2’s 18V output.

Do I have to plug it in to use it?
No—that’s the point. During playback the battery powers your gear with the mains completely out of the picture. Connect the included charger between sessions, or let automatic charging kick in below 10%.

What difference will I hear?
Phono signals are tiny, so power line noise ends up amplified with the music. Battery power removes it entirely—listeners report quieter backgrounds, better separation and imaging, and a more spacious, relaxed sound.

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