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PRO-JECT Head Box S3 B: Headphone Amplifier
PRO-JECT Head Box S3 B: Headphone Amplifier
PRO-JECT Head Box S3 B: Headphone Amplifier
PRO-JECT Head Box S3 B: Headphone Amplifier
PRO-JECT Head Box S3 B: Headphone Amplifier
PRO-JECT Head Box S3 B: Headphone Amplifier
PRO-JECT Head Box S3 B: Headphone Amplifier
PRO-JECT Head Box S3 B: Headphone Amplifier
PRO-JECT Head Box S3 B: Headphone Amplifier
PRO-JECT Head Box S3 B: Headphone Amplifier

PRO-JECT Head Box S3 B

Fully balanced headphone amplifier (low noise and great separation).

Inputs: RCA + XLR | RCA loop output

Outputs: 3.5 mm and 6.3 mm + balanced 4.4 mm and 4-pin XLR

Max. power: up to 820 mW/32 Ω (min. 8 Ω)

SNR >115 dB, THD <0.002%

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€329.75
No VAT included

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Distributor stock (48-72h)

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957460112
info@audiohum.com

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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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