Pro-Ject Phono Box RS Phono Preamplifier Black - Open Box
Pro-Ject Phono Box RS Phono Preamplifier Black - Open Box
Pro-Ject Phono Box RS Phono Preamplifier Black - Open Box
Pro-Ject Phono Box RS Phono Preamplifier Black - Open Box
Pro-Ject

Pro-Ject Phono Box RS Phono Preamplifier Black - Open Box

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A phono preamplifier from Pro-Ject with stepless input impedance control from 10 to 1,200 ohms, balanced XLR and RCA inputs and outputs, switchable RIAA or DECCA equalisation and a switchable subsonic filter.

THIS IS AN OPEN BOX PRODUCT AND MAY HAVE SOME COSMETIC BLEMISHES, PHOTOS COMING SOON, HOWEVER WE WILL SEND PHOTOS TO YOU BEFORE SHIPPING TO CONFIRM WITH YOU.

This listing is the Black version.

Impedance
Stepless, 10Ω to 1,200Ω
Gain
40, 50 or 60dB (+6dB on XLR)
Noise floor
91dB (A weighted)
Equalisation
RIAA or DECCA
Connections
RCA and XLR in and out
Size (W × H × D)
206 × 72 × 200mm

Why you will love it

Variable impedance, even while you listen

A front-panel knob sets input impedance steplessly from 10 to 1,200 ohms, aimed at low-output moving coil cartridges. Pro-Ject says input impedance can be changed while listening.

For other settings, Pro-Ject says to engage mute first.

Pro-Ject Phono Box RS phono preamplifier in black, front panel with impedance knob and switches

Set up for MM and MC cartridges

For high-output moving coil and moving magnet cartridges, dip switches at the back select input capacitance of 100, 200, 300, 420 or 520pF with 47k ohm input impedance.

Input gain is 40 or 50dB for those cartridges and 60dB for low-output moving coil, with 6dB more through the XLR outputs.

Balanced and unbalanced connections

There is one pair of RCA and one pair of XLR input sockets, selected with a switch, and one pair of RCA and one pair of XLR line-level outputs. Pro-Ject says not to connect the RCA and XLR outputs at the same time.

Connect the output to a line input on your amplifier, not its phono input.

Rear of the Pro-Ject Phono Box RS in black showing RCA and XLR inputs and outputs

RIAA or DECCA, with a subsonic filter

A switch selects the RIAA or DECCA de-emphasis curve, with accuracy of 0.3dB maximum from 20Hz to 20kHz.

A subsonic filter at 20Hz with 12dB per octave slope can be switched on or off.

Low noise and distortion figures

Pro-Ject lists a noise floor of 91dB (A weighted) and total harmonic distortion of 0.019%. The unit runs from an outboard power supply.

Is it right for you?

A great fit if you…

  • Have a turntable without a built-in phono stage
  • Use a low-output moving coil cartridge and want stepless impedance matching
  • Want XLR as well as RCA connections

Worth knowing

  • Connect the output to a line input, not a phono input
  • Do not connect the RCA and XLR outputs at the same time, per Pro-Ject
  • It is supplied with an outboard power supply and is for use with a turntable and amplifier you already own

Build your system

The Phono Box RS outputs line level to your amplifier.

Specifications

Inputs and outputs

Input 1 pair RCA, 1 pair XLR
Line-level output 1 pair RCA, 1 pair XLR
Input impedance, variable Stepless, 10 to 1,200 ohms (low-output MC)
Input impedance, fixed 10 ohms (low-output MC)
Input capacitance 100, 200, 300, 420, 520pF, with 47k ohms (MM and high-output MC)
Input gain 40dB and 50dB (MM and high-output MC), 60dB (low-output MC), +6dB using XLR

Performance

Noise floor 91dB (A weighted)
THD 0.019%
De-emphasis accuracy 20Hz to 20kHz, 0.3dB maximum
Equalisation curves RIAA and DECCA
Subsonic filter 20Hz, 12dB per octave

Power and size

Power supply Outboard, ±18V / 250mA DC
Power consumption 150mA DC, under 1W in standby
Dimensions (W × H × D) 206 × 72 × 200mm (210mm with sockets)
Weight 2kg without power supply

Specifications from Pro-Ject Audio Systems (Phono Box RS instructions for use), checked November 2026.

What is in the box

  • Pro-Ject Phono Box RS phono preamplifier
  • Outboard power supply
  • Instructions for use

Questions people ask

Can I change impedance while playing a record?

Pro-Ject says variable input impedance can be set while listening. Engage mute for other settings.

Does it have XLR connections?

Yes. It has one pair of RCA and one pair of XLR inputs and outputs. Do not connect the RCA and XLR outputs at the same time.

Which input on my amplifier do I use?

A line input such as AUX, CD or Tuner, not the phono input.

Does it support DECCA?

Yes. A switch selects RIAA or DECCA de-emphasis.

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