Pro-Ject Audio Pre Box S3 Stereo Preamplifier | Pro-Ject Audio Australia
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Pre Box S3

Stereo Preamplifier

The Pre Box S3 is a highly versatile stereo preamplifier designed to unite analogue, digital, and wireless sources in a single compact component. It combines audiophile sound quality with extensive connectivity, making it an ideal control centre for modern high-fidelity systems that include turntables, streaming devices, and TV. five different digital filters, shaping the sound to your preference. It offers full DSD256 support and upsampling of all input signals to 768kHz from USB, coaxial and optical inputs.

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Arriving 18th September
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High Fidelity Listening Experience

Our audiophile analogue and digital circuitry is engineered for maximum signal purity and musical authenticity. The low-noise analogue design is carefully optimised with short signal paths to preserve dynamics, tonal balance, and fine detail without unnecessary processing. High-resolution digital sources are converted via a premium 24-bit/192 kHz DAC with precise internal clocking for low jitter and accurate timing, while strict separation of digital and analogue sections prevents noise from degrading the signal. The result is a clean, natural, and engaging sound that faithfully reflects the character of every source.

Versatile In- and Outputs

The Pre Box S3 offers all modern connectivity to act as your central Hi-Fi stereo hub. You can also connect digital sources like your TV via eARC or a CD transport via the coax or optical S/PDIF inputs and use the internal DAC with a quality up to 24bit and 192kHz. It also provides versatile output options. The variable RCA output is connected to your power amp. A seperate fixed line-level output allows you to forward the connected sources to your external headphone amplifier or second zone. Connect your subwoofer via the dedicated sub-output. Trigger connectivity for remote turn on/off is included next to a very versatile RS232 connector for custom installation remote control.

Technical Specifications

  • Frequency response (20Hz - 20kHz): <-0,4dB
  • Line preamp gain:4,5dB
  • Phono preamp gain: 45dB
  • Channel separation: - 72dB at 10kHz
  • Signal to noise ratio:110dB (120dB-‚A‘ weighted)
  • THD: < 0,007%
  • Headphone amplifier: 2x 70mW at 32ohm (1%THD)
  • Headphone output:6,3mm jack (16 – 600ohms)
  • Analogue inputs: 2x pair RCA, 1x phono MM (RCA)
  • Digital inputs: RCA coax, 2 x Toslink, Bluetooth, async. USB C, eARC
  • Bluetooth: 5.0, aptX, aptX HD, A2DP profile
  • DA-converter: Cirrus Logic CS4344 24bit/192kHz
  • Outputs: 1x variable RCA, 1x fix 3.5mm jack, 1x sub RCA
  • Trigger output: 12V DC; 2-pole co-axial 2,5mm jack
  • Power supply: 18V/500mA DC;100 - 240V, 50/60Hz
  • RS232: pluggable 3-PIN terminal block
  • Standby power consumption: < 0,5 watts
  • Dimensions WxHxD:206x55x153 (176mm with sockets)
  • Weight: 1020 g without power supply

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