Power Box S3 vs Accu Box S2: Phono Power Supply Options
By Audio Advisor | Turntables, Speakers, Headphones & Hi-Fi Equipment | Published: 2026-11-04
Category: 購買指南
Compare Pro-Ject's filtered Power Box S3 Phono and battery-powered Accu Box S2 to decide which phono power supply upgrade suits your turntable setup.
Quick answer
Choose the Pro-Ject Power Box S3 Phono if you want one filtered supply to replace the wall-warts for both your turntable and phono stage. Choose the Accu Box S2 if your priority is taking your phono electronics completely off the mains with battery power.
Filtered AC vs battery: two different ways to clean up phono power
The Power Box S3 Phono tackles noise by filtering the AC supply and feeding two purpose-set voltages from one aluminum chassis. It is a direct replacement for the plastic wall-warts that often power a turntable and a phono preamp, and it reduces the clutter and shared noise of two separate supplies.
The Accu Box S2 takes a different route: it runs your phono electronics on rechargeable Li-Pol battery power, so mains-borne interference and RFI never enter the signal path. That can be appealing when you have already addressed other noise sources and want the phono stage isolated from the wall entirely.
What each approach asks of your system
The Power Box S3 Phono still connects to the mains, so it cleans and distributes power rather than removing the mains connection. Its two outputs are set for a turntable and a Pro-Ject phono stage, which makes it a neat match if both of your low-signal devices are Pro-Ject or compatible.
The Accu Box S2 introduces battery management into your routine. You are trading the simplicity of a plug-in supply for the isolation of battery power, and that trade-off matters if you want a set-and-forget solution versus the quietest possible phono supply.
Where the decision usually turns
If your turntable and phono stage currently use separate wall-warts, the Power Box S3 Phono solves two problems at once: it consolidates the supplies and filters the power feeding both. If your phono stage is already on a clean linear supply and you are chasing the last bit of mains noise, the Accu Box S2 is the more targeted upgrade.
Neither product is a universal fix for hum. Address grounding, cable routing, and cartridge alignment first; a power supply change is most effective once the basics are sorted.
Decision rules for choosing between the Power Box S3 Phono and Accu Box S2
- You have two wall-warts: If your turntable and phono stage each use a separate plastic wall-wart, pick the Power Box S3 Phono. It replaces both with one filtered supply and two correct voltages. Count your current supplies before deciding; two wall-warts is the clearest sign the S3 Phono will simplify your setup.
- You want the phono stage off the grid: If your main goal is to eliminate mains-borne noise from the phono signal entirely, pick the Accu Box S2. Battery power means no AC connection during playback. Confirm your phono stage can run from the Accu Box S2's battery output before committing.
- You are unsure which noise source matters: Fix grounding and cable routing first. If hum persists and both your turntable and phono stage use basic supplies, the Power Box S3 Phono is the broader first upgrade. If only the phono stage remains noisy, the Accu Box S2 is the more focused choice. Troubleshoot the free fixes before spending on either supply.
Product facts
- Pro-Ject Power Box S3 Phono Power Supply and Filter - Silver: Single filtered supply with two outputs and two purpose-set voltages for a turntable and phono stage. It replaces two wall-warts with one chassis, reducing outlet clutter and filtering the power for both low-signal devices.
Pro-Ject Power Box S3 Phono Power Supply and Filter - Silver - Pro-Ject Accu Box S2 Battery Power Supply - Black: Runs phono electronics on five rechargeable Li-Pol battery cells with 2.6Ah capacity. Battery operation removes the mains connection entirely, so hum and RFI from the wall cannot reach the phono signal.
Pro-Ject Accu Box S2 Battery Power Supply - Black
Who should choose which
Best for
- Listeners with a Pro-Ject turntable and phono stage running on separate wall-warts who want one filtered supply.
- Anyone who wants to reduce outlet clutter and add filtering without changing their listening routine.
Not for
- Systems where the phono stage already runs on a clean linear supply and the turntable does not need a shared filtered feed.
- Listeners who prefer a simple plug-and-play supply and do not want to manage battery charging.
