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Pro-Ject Power Box RS Phono power supply

The Pro-Ject Power Box RS Phono is a battery power supply for the Phono Box RS: a lithium-polymer battery (one for each channel) completely isolates the Phono Box RS from mains interference and noise during playback. Playing time about 4 hours, charging time about 4 hours, controlled by an intelligent microprocessor; 201 x 72 x 195 mm, 2030 g.

Full description
  • Purest and cleanest power for Phono Box RS

  • Completely isolates Phono Box RS from mains interference and noise during playback

  • Advanced lithium-polymer battery (one for each channel)

  • Playing time approx. 4 hours

  • Charging time approx. 4 hours

  • Optimised battery life thanks to intelligent microprocessor-controlled charging electronics

  • Status indicator LEDs on the front

  • Available in silver or black

We at Pro-Ject Audio Systems are strongly convinced that a power supply is a very important part of the audio path and contributes considerably to the sound quality of an audio product. To offer maximum sound quality and to isolate the phono preamplifier optimally from mains interference, we designed the battery-powered Power Box RS Phono.

Pure and clean power is very important wherever low-level signals are amplified. A turntable cartridge delivers the lowest signal level of all known audio signal sources. The typical level of a low-output MC cartridge is about 0.2 mV = 0.0002 V. Such a low-level signal is very vulnerable to all kinds of interference and noise.

How does it work?

When Power Box RS Phono is connected to Phono Box RS and switched on, only the batteries are connected (adapter and charger are physically disconnected), so Phono Box RS is completely isolated from mains interference. When the battery voltage drops and reaches certain limits at which further playback would endanger the condition of the battery, the charger is connected automatically. This status is indicated by an LED on the front panel. Everything continues without limitation and playback remains possible, but the benefit of complete isolation is lost for the charging period. Even though the greatest benefit is temporarily unavailable, the battery now acts as a very large filter bank and the sound is still much better than with the standard power adapter. When the battery is fully charged, the charger is disconnected and Power Box RS Phono again powers Phono Box RS from the battery packs alone

Specifications
Output voltage
from +/-14.8V to +/-16.8V
Battery type and capacity
Volts Li-ion, 2000 mAh
Charging time
approx. 4 hours
Playing time on battery
approx. 4 hours
External power supply
20V/3000 mA DC
Dimensions
201 x 72 x 195mm
Weight
2030 g without power supply
Advice or a listening session

Would you like to hear this first? In our two listening rooms on Hoenderstraat in Maastricht, each with its own acoustics, we will set up the system for you. Make an appointment or call 043-7370028 — we are happy to help you find the right choice and the right placement.

Warranty

We guarantee that this product complies with the agreement, the specifications in the offer and the statutory provisions. Many brands also give their own warranty on their equipment. An additional warranty never limits your statutory rights: you can always rely on the law. Something wrong with your purchase? Contact us. Read more about warranty

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Price
€ 499.00 € 499.00
Price per item Including VAT
Delivery time on request
Shipping · Returns · Warranty · General terms and conditions
Reviews
4,5

Very good — 48 reviews on Google

Neatly packed and shipped

Very satisfied with the service of this shop. I recently ordered a Rega phono amplifier and a matching cable, and they were shipped neatly packed.

Johan T.2025

Beautiful shop in the centre of Maastricht

Great repair service. Beautiful shop in the centre of Maastricht with great equipment and friendly, enthusiastic and knowledgeable staff / owners. I was helped very well.

Raymond B.2025

The owner closed the shop to help

I bought a second-hand soundbar from Audiofrenzy. The service is quick and friendly. I needed help getting the device into my car and the owner helped me straight away — he closed the shop to do so. Old-fashioned service and respect for the customer.

Jen V.May 2026

Read all reviews on Google

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At Audiofrenzy we believe that music only truly comes to life with the right equipment. Our specialists are happy to help you make the best choice for your system.

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