{"id":307870,"date":"2026-01-30T04:01:19","date_gmt":"2026-01-30T04:01:19","guid":{"rendered":"https:\/\/www.ecoustics.com\/products\/pro-ject-pre-box-s3\/"},"modified":"2026-01-30T04:01:23","modified_gmt":"2026-01-30T04:01:23","slug":"pro-ject-pre-box-s3","status":"publish","type":"post","link":"https:\/\/www.ecoustics.com\/products\/pro-ject-pre-box-s3\/","title":{"rendered":"Pro-Ject’s Pre Box S3 Is the Desktop Hub You Actually Need \u2014 Preamp, DAC, and Headphone Amp in One Tiny Box"},"content":{"rendered":"\n

Small boxes usually come with big compromises. The\u00a0Pre Box S3<\/strong>\u00a0mostly ignores that rule. Built by\u00a0Pro-Ject Audio Systems, this compact stereo preamplifier is designed to sit comfortably on a desk yet function confidently as the control center for a system. It handles analog, digital, and wireless sources, works as a preamplifier, headphone amplifier, and DAC, and is flexible enough for an office setup or a slimmed-down main rig where rack furniture isn\u2019t invited. Pricing is set at\u00a0$699<\/strong> (\u00a3499 \/ \u20ac599), positioning the Pre Box S3 as a mid-priced option for a compact preamplifier that also covers DAC and headphone duties in one unit.<\/p>\n\n\n\n

The idea is simple and refreshingly grown-up: source switching and volume control handled in one tidy box, with enough connectivity to cover turntables, TVs, streamers, laptops, CD players, and headphones without drama. Pro-Ject claims 13 inputs and outputs in total, which sounds like marketing bravado until you realize it actually adds up. Pair it with active speakers or a compact power amp, and you\u2019ve got a modern hub that keeps things small, clean, and functional\u2014without feeling like a compromise system you\u2019ll want to \u201cupgrade away from\u201d in six months.<\/p>\n\n\n\n

Pro-Ject Pre Box S3: A Compact Hub for Modern Audio Systems<\/h2>\n\n\n\n
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This is a do-it-right, don\u2019t-show-off design. The analogue stage uses short, low-noise signal paths, and the digital and analogue sections are kept properly isolated. A 24-bit\/192kHz DAC with accurate clocking handles digital sources, keeping noise and timing errors under control. The result is neutral, consistent playback that reflects the source rather than imposing a sound of its own.<\/p>\n\n\n\n

Connectivity is practical rather than flashy. Two RCA line-level inputs sit alongside coaxial and optical digital inputs, plus HDMI eARC for TV audio. A dedicated subwoofer output allows proper low-frequency integration in compact systems. There\u2019s a built-in moving magnet phono stage with 45dB of gain, so turntables can plug straight in, and USB-C support covers laptops and modern mobile devices without adapters. Headphones are handled via a 6.3mm jack rated for 16\u2013600 ohms (2 x 70mW at 32 ohms), or wirelessly over Bluetooth 5.0 with aptX HD, capped at 24-bit\/48kHz.<\/p>\n\n\n\n

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The analog outputs can operate in variable mode for power amplifiers or fixed mode for secondary systems, and RS232 support allows integration into custom or multi-room installations. Digital conversion is handled by a Cirrus Logic CS4344 DAC with support for PCM up to 24-bit\/192kHz. Streaming and file playback are strictly PCM-based. There is no support for MQA or DSD<\/strong>, and Bluetooth stops at aptX HD\u2014no aptX Lossless or LDAC.<\/p>\n\n\n\n

Power is supplied via an external 18V\/500mA DC adapter with universal 100\u2013240V, 50\/60Hz compatibility, and standby power consumption remains below 0.5 watts. RS232 connectivity is provided via a pluggable 3-pin terminal block for custom installation or multi-room control. The chassis measures 206 \u00d7 55 \u00d7 153 mm (176 mm without sockets), which translates to 8.1 \u00d7 2.2 \u00d7 6.0 inches (6.9 inches deep without sockets), and the unit weighs 1,020 grams (2.25 pounds) without the power supply.<\/p>\n\n\n\n

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The Bottom Line<\/h2>\n\n\n\n

The Pro-Ject Pre Box S3 is a compact control center that focuses on doing the essentials properly. It combines a preamplifier, DAC, headphone amplifier, moving magnet phono stage, HDMI eARC<\/a>, and Bluetooth in a desktop-friendly chassis, with enough connectivity to anchor a small office system or a space-conscious main rig. Digital support is limited to PCM up to 24-bit\/192kHz, with no MQA, DSD, or advanced Bluetooth codecs beyond aptX HD, so expectations should be set accordingly.<\/p>\n\n\n\n

Designed as a natural partner for Pro-Ject\u2019s Amp Box S3 or Amp Box DS2<\/a> when more power is required, it also works just as well with other power amplifiers or active speakers.\u00a0<\/p>\n\n\n\n

For more information: project-audio.com<\/a><\/p>\n\n\n\n