Pro-Ject Tube Box S2 Phono Preamplifier Review

The Pro-Ject Tube Box is a compact, high quality preamplifier that offers the same sound and performance as its larger siblings. It features an integrated phono stage with switchable line level input for connecting to turntables or CD players, plus balanced XLR outputs for connection to external amplifiers.

The Pro-Ject Tube box has been designed to work in conjunction with the Pro-Ject Debut 2 speakers which are available separately.

The Pro-Ject Tube Box S2 is a tube based preamp featuring a new design of power supply circuit. This allows it to be used with any type of loudspeaker without compromising on sound quality.

It also includes a built-in phono stage with switch-able line level input for use with turntables or CD/DVD players.

The Pro-ject Tube Box S2 comes with a remote control allowing you to adjust volume, balance and treble boost from up to 30 feet away.

Look and Feel:

The Pro-jectTube Box S2 looks great and feels solid in your hands. Its brushed aluminium front panel houses all controls and indicators. A large rotary encoder knob lets you easily select between the different inputs and outputs.

Set Up:

To set up the Pro-jectTube BoxS2, simply connect the supplied 3.5mm jack plug to the rear of the unit. Then turn the volume control clockwise until the red LED indicator lights up. You can then adjust the volume using the remote control.


The Pro-jectBox S2 is a very well made piece of equipment. It’s sturdy and robust, yet light enough to carry around.

When connected to a pair of Pro-ject Debut 2 speakers, the Pro-ject Tube Box S2 delivers a full range of frequencies with plenty of detail. Bass response is tight and punchy, while midrange sounds clear and detailed. Treble is smooth and extended, but never harsh.

When connected to a standard speaker system, the Pro-ject Box S1 will deliver a similar sound. However, if you’re looking for more bass, the Pro-ject Debut 2 speakers offer a deeper low frequency response than most other speakers.

What We Like

  • Compact size
  • High quality build
  • Balanced XLR output connections
  • Built-in phono stage
  • Remote control

What We Don’t Like

  • No USB port
  • No headphone jack
  • No RCA inputs

FAQs – Pro-Ject Tube Box S2 Phono Preamplifier (Black)

What’s the difference between the Pro-Ject Tube boxes?

The Pro-Jct Tube Box S1 and S2 are identical except for their size. They both feature a new design of power supplies that allow them to be used with any kind of speaker without compromising on sound quality; they can even be used with subwoofers.

Both models have a built-in phonic stage with switchable line input for use with turndowns or CD/DVD players, and a pair of balanced XLR outputs for connecting to external amplifiers. The S2 model adds a remote control allowing you adjust volume, balance and Treble Boost from up to 30 feet way.

Both models come with a carrying case.

Can I use my own speakers instead of the Pro-Ject speakers?

Yes, but only if your speakers have a low impedance rating. If your speakers have a higher impedance rating than 8 ohms, then you will need to use the supplied speakers.

Can I connect my turntable directly to the Pro-Ject tube box?

No, because the Pro-Ject tubes do not provide enough power to drive a turntable. You would need to connect your turntable to a separate amplifier.


If you want a small, portable, high quality preampler that can handle all types of music, then the Pro-Ject S2 Tube Box is the one for you.

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