Pro-Ject Stereo Box S3 BT Integrated Amplifier
Pro-Ject Stereo Box S3 BT Integrated Amplifier
Pro-Ject Stereo Box S3 BT Integrated Amplifier

Pro-Ject Stereo Box S3 BT Integrated Amplifier

Regular price£359.00
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Tax included. Shipping calculated at checkout.

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Delivery is available across mainland UK. If you are located outside mainland UK and would like a shipping quote, please get in touch before placing your order.

We aim to dispatch in-stock items as soon as possible provided that we physically have the stock - but please note that sometimes we have to order from our supplier for certain products, in which case delivery should take place within 1-5 working days of the order being placed.

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Please note that used headphones (for hygiene reasons) and custom or special-order items cannot be returned. If you need assistance arranging a return, we’re always happy to help.

Product Summary

The Pro-Ject Stereo Box S3 BT is a compact integrated amplifier for customers who want a neat, space-saving hi-fi system without losing the flexibility to connect both wired and wireless sources. It is especially useful where a full-size amplifier would feel too bulky, but proper stereo sound is still the goal.

With two RCA line inputs and Bluetooth 5.0 with aptX HD, it makes it easy to connect traditional source components alongside wireless playback from a phone, tablet or similar device. The variable output also adds useful flexibility for customers who may want to add a subwoofer, active speakers or a second amplifier later on.

Its ultra-compact aluminium casework helps it fit easily into shelves, desks and smaller living spaces, while still offering enough power for a wide range of room-friendly speaker systems. For customers wanting a simple, elegant and genuinely practical compact amplifier, the Stereo Box S3 BT is an excellent option.

Key Benefits

  • Ultra-compact design makes it easy to build a proper hi-fi system in smaller spaces
  • Bluetooth 5.0 with aptX HD gives you a higher-quality wireless music option alongside wired sources
  • Two RCA inputs make it easy to connect traditional hi-fi components such as CD players or streamers
  • Variable output lets you add a subwoofer, active speakers or a second zone amplifier more easily
  • Analogue volume control with motor driven potentiometer helps provide a more satisfying everyday user experience
  • Rigid aluminium casing helps reduce interference and gives the amplifier a more premium feel
  • Remote control makes day-to-day operation simple from your listening position
  • Strong choice for customers wanting a compact amplifier with genuine stereo flexibility
  • 2 years manufacturers warranty, extended to 3 years if registered with Pro-Ject within 4 months of purchase

Technical Specifications

Amplifier Details

  • Product Type: Ultra compact integrated amplifier
  • Output Power: 2 x 21 W into 8 ohms / 2 x 40 W into 4 ohms (1% THD)
  • Frequency Response: Less than -1.5 dB at 20 Hz - 20 kHz into 4 ohms
  • Signal to Noise Ratio: 96 dB, 100 dB A-weighted at 4 ohms
  • Channel Separation: -67 dB at 10 kHz
  • THD: Less than 0.12% at 5 W / 4 ohms
  • Gain: 32.5 dB
  • Inputs: 2 pair RCA line inputs
  • Input Impedance: 25 kOhms
  • Variable Output: 3.5 mm stereo jack
  • Speaker Outputs: 4 mm banana plugs, spade connectors or bare wire
  • Bluetooth Version: 5.0
  • Bluetooth Codecs: aptX, aptX HD, A2DP profile
  • Power Supply: 20 V / 3 A DC, 100 - 240 V, 50 / 60 Hz
  • Standby Power Consumption: Less than 0.5 W
  • Remote Battery Type: 2 x AAA 1.5 V
  • Colour Options: Black or silver
  • Made In: Europe

Weight & Dimensions

  • Dimensions: 10.3 x 3.7 x 11.5 cm (W x H x D)
  • Dimensions including sockets: 10.3 x 3.7 x 13.8 cm (W x H x D)
  • Weight: 0.45 kg without power supply

What’s in the Box

  • Pro-Ject Stereo Box S3 BT integrated amplifier
  • IR remote control
  • Power supply
  • Product documentation

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Our Trustpilot reviews

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What an amazing company. Anna in the Glasgow branch has been so informative and helpful with my order. Sam in the Aberdeen branch has an incredible knowledge of older amps and speakers.

Alan
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I bought a full system from the Aberdeen shop. Christian was very attentive throughout the whole process. I found that all the staff in the shop were both knowledgeable and helpful. I would strongly recommend Holburn Hi-Fi to anyone thinking about buying a full or part Hi-Fi system.

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Jesse is very professional and always happy to help in the Glasgow Audio store. He is very knowledgeable about the products. Highly recommend.

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The guys at Holburn Hifi were fantastic from start to finish. Explained everything clearly and in simple terms which I really appreciated as I was lost amongst all the info I had seen online. There was no hard sell and certainly an understanding of my budget. I can’t recommend Holburn Hi Fi highly enough. Thanks to Ian, Sam and Christian.

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