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Pro-Ject - Tube Box S2 - Phono Preamplifier

Why Pay Full Price? Why Pay Full Price?
Original price $699.00
Original price $699.00 - Original price $699.00
Original price $699.00
Current price $629.00
$629.00 - $629.00
Current price $629.00
1+ in stock
1+ in stock

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Turn up the dial on your auditory experience with the Pro-Ject Tube Box S2 Phono Preamplifier, a tiny titan that promises luxe, powerful sound enhancement. This is Pro-Ject’s first-ever fully discreet circuit design product, bypassing operational amplifiers in favour of a more personalised and immersive soundscape. With replaceable tubes for ultimate sound tweaking and multiple gain settings, your sonic experience is tailored to perfection. The Tube Box S2 deftly handles both MM and MC cartridges, featuring variable input impedance settings ensuring absolute compatibility. Housed in a DS2 line metal casing for vibration and electromagnetic interference protection, this compact high-end solution delivers sound of superior quality. Dive deep into a world of rich mids and relaxed, full-bodied sound with the Pro-Ject Tube Box S2 Phono Preamplifier. There's never been a better way to experience your favourite tunes.

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ℹ Product Information

Experience the pure, unadulterated symphony of sound with Pro-Ject's Tube Box S2 Phono Preamplifier - the soul of your audio system.

Crafted with passion and precision, the Tube Box S2 is the epitome of audiophile excellence. It's the first of Pro-Ject's enduring legacy to provide a fully discrete circuit design without using any operational amplifiers (OpAmps). Moreover, it brings to life the exciting possibility of tube rolling and sound-shaping.

The Tube Box S2 is not just a preamplifier; it's a game-changer, a symphonic maestro that imparts a distinct mellifluence to the music you adore. Feel the fullness and rich vibrancy of sound it offers – laid back yet dynamic, with opulent mids that ooze grandiosity. It's like experiencing a large-scale high-end tube phono pre-amplifier, but in a more refined, compact version.

The Tube Box S2 is more than compatible with both MM and MC cartridges and is designed for fine-tuning with several gain settings on the front panel. Adjustable input impedance caters to any MM cartridge, while the 47k ohms one is a perfect match for high output MC cartridges. Encased in an aluminium/metal body mimicking our DS2 line, this preamp is armed against vibrations and electromagnetic interferences, delivering nothing but superior sound.

Dive into a world of impeccable auditory pleasure with this true high-end solution, featuring an ultra-low noise circuitry, dual mono circuitry, gold-plated RCA in and outputs, and many more enticing features. The Tube Box S2 comes in elegant silver or black finishes, oozing modern appeal. Unleash your music's full potential and transcend the ordinary with the remarkable Tube Box S2.


  • Fully Discreet Circuit Design: The Tube Box S2 uniquely employs an entirely discrete circuit, shunning operational amplifiers altogether. This groundbreaking design ensures better sound quality and a more personalized listening experience.

  • Tube Rolling and Sound-Shaping: Incorporating revolutionary technology which allows for the replacement of tubes, it provides the flexibility to tailor your sound signature according to your preferences.

  • Vast Compatibility: The Tube Box S2 is equipped to support both MM and MC cartridges, boasting various gain settings instantly available via the front panel.

  • Adjustable Input Impedance: Offering five variable input impedance settings, it caters to any MM cartridge, whilst the 47k ohms input impedance is ideal for high-output MC cartridges.

  • Superior Shielding: Protected within an aluminium/metal casing, it's perfectly shielded against vibrations and electromagnetic interferences, thus delivering a flawless sound experience.

  • Gold-Plated RCA In and Outputs: Ensuring high-performance signal transmission while preventing corrosion, the gold-plated RCA connectors further heighten the quality of your listening experience.

  • Ultra Low-Noise Circuitry: Equipped with a FET input stage and polystyrene capacitors, the preamp supports an ultra low-noise circuit, significantly escalating the purity of the audio.

  • Dual Mono Circuitry: Ingeniously designed with separate circuits for each channel, the Tube Box S2 guarantees optimized channel separation, enriching your sound with a high-definition stereo effect.


  • Exceptional Sound Quality: The discrete circuit design and tube rolling technology together produce a full, laid-back sound with lush mids, recreating the sonic majesty of a high-end tube phono pre-amplifier.

  • Personalized Listening: The Tube Box S2 offers the unique option for you to customize your sound signature, providing an extraordinary, individualized audio experience.

  • Versatile Pairing: Whether your cartridges are MM or MC, the Tube Box S2 smoothly caters to both, offering a variety of easily adjustable gain settings.

  • Purity of Sound: The impeccable shielding from vibrations and electromagnetic interferences, combined with ultra low-noise circuitry, assures the delivery of pure, uninterrupted sound.

  • Improved Signal Transmission: The inclusion of gold-plated RCA connectors enhances the overall signal transmission, yielding better sound quality.

  • Enhanced Stereo Effect: With dual mono circuitry, soundscape opulence and balance are elevated, engendering a breathtaking stereo effect.

Embrace the Tube Box S2's unique combination of features and benefits that will take your audio experience to new heights.

ℹ Specifications
Specification Description
Product Type Tube Phono Preamplifier
Circuit Design Fully discreet, without OpAmps
Tubes 2x ECC83 tubes (replaceable)
Sound-shaping Via tube rolling
Compatibility Supports both MM and MC cartridges
Gain settings Many settings, switchable on the front panel
Input Impedance 10/100/470/1k/2k ohms, fix 47k ohms
Capacitance 50 / 150 / 270 / 370 / 490 / 590 pF
Gain MM/MC 40 / 43 / 50 / 60 / 63 dB
Signal to Noise Ratio 77dBA
THD+N < 0,0025%
RIAA Curve Accuracy +/- 0,4dB/20Hz - 20kHz
Subsonic Filter 20Hz @ 12dB/octave
Input/Output 1x RCA / 1x RCA
Dimensions 103 x 37 x 119 mm
Material Sandwich aluminium/metal casing
Protection Against vibrations and electromagnetic interference
Colours Available in silver or black
Power External adapter and multiple internal power supplies
Special Features Front-sided Subsonic filter button, Front-sided Gain control, Ultra low noise circuitry with FET input stage, Dual mono circuitry for optimized channel separation, Polystyrene capacitors used where possible, Gold-plated RCA in and outputs.

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