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PRO-JECT Head Box S3 B: Fully balanced audiophile headphone amplifier with RCA and XLR
The Pro-Ject Head Box S3 B is a high-performance headphone amplifier built for listeners who want to step into true balanced amplification without blowing the budget. Its topology runs a fully balanced signal path and is engineered to strike a convincing balance between available power, ultra-low noise and audible sound quality.
It’s an excellent choice for both desktop and HiFi systems: it supports balanced and single-ended headphones, offers RCA and XLR inputs, and includes an RCA loop output for easy integration into an existing chain.
Key highlights
Fully balanced: better separation, lower noise
The Head Box S3 B handles balanced signal via both RCA and XLR, maximising channel separation and reducing background noise—especially useful with sensitive headphones or in environments with interference.
Outputs for any headphone
Balanced: 4.4 mm Pentaconn and 4-pin XLR
Single-ended: 3.5 mm and 6.3 mm
So you can drive anything from IEMs and portable headphones to demanding high-impedance models.
Solid, long-lasting build
Rigid aluminium chassis for mechanical stability and shielding, made in the EU with long-term reliability in mind.
Technical specifications
Maximum output power:
480 mW / 8 Ω
680 mW / 16 Ω
820 mW / 32 Ω
320 mW / 300 Ω
Headphone outputs: 3.5 mm / 6.3 mm / 4.4 mm balanced / 4-pin XLR balanced
SNR: >115 dB (A) @ 1 kHz
THD: <0.002% @ 1 kHz (500 mV input)
Crosstalk: < -81 dB @ 10 kHz
Gain: 15 dB / 9 dB (RCA input / XLR input)
Frequency response: < -0.25 dB (20 Hz – 20 kHz)
Analogue inputs: 1 × RCA pair, 1 × XLR pair
Loop output: 1 × RCA pair
Minimum headphone impedance: 8 Ω
Power supply: 18 V / 1 A DC (110–240 V, 50/60 Hz)
Standby consumption: <0.5 W
Dimensions (W × H × D): 206 × 55 × 153 (170) mm
Weight: 950 g (without power supply)
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