Pro-Ject Head Box S3 B Headphone Amplifier

Product Summary

The Pro-Ject Head Box S3 B is a high-end headphone amplifier designed for customers who want a more serious dedicated amp for both balanced and single-ended headphones. It is a strong option for desktop and hi-fi systems where clarity, channel separation and lower-noise performance matter more than just adding a basic headphone socket.

A big part of the appeal is its fully balanced design. With both RCA and XLR inputs, plus balanced 4.4 mm and 4-pin XLR headphone outputs alongside conventional 3.5 mm and 6.3 mm sockets, the Head Box S3 B is built to suit a wide range of headphone setups while giving customers a clear route into higher-performance balanced listening.

It is also designed to feel like a proper hi-fi component rather than just a utility box. The full aluminium enclosure, strong measured performance and compact casework make it an appealing choice for customers who want a serious headphone amplifier that fits neatly into modern systems. For customers wanting a compact but genuinely ambitious headphone amp, the Head Box S3 B is an excellent choice.

Key Benefits

• Fully balanced topology is designed to deliver greater channel separation with lower noise
• Supports both balanced and single-ended headphones for wider system flexibility
• Balanced 4.4 mm and 4-pin XLR outputs make it a strong choice for higher-end headphone setups
• RCA and XLR inputs make it easier to integrate into desktop and full hi-fi systems
• Strong output capability helps it partner a wide range of headphones confidently
• Compact size makes it easy to place neatly into smaller systems and shelves
• Full aluminium enclosure helps shield the circuitry and gives the unit a more premium feel
• Strong option for customers wanting a serious headphone amplifier with modern balanced connectivity
• 2 years manufacturers warranty, extended to 3 years if registered with Pro-Ject within 4 months of purchase

Technical Specifications

Headphone Amplifier Details

• Product Type: Fully balanced headphone amplifier
• Max Power Output: 480 mW / 8 Ohms, 680 mW / 16 Ohms, 820 mW / 32 Ohms, 320 mW / 300 Ohms
• Headphone Outputs: 3.5 mm, 6.3 mm, 4.4 mm balanced, 4-pin balanced XLR
• Signal to Noise Ratio: Greater than 115 dB A-weighted at 1 kHz
• THD: Less than 0.002% at 1 kHz @ 500 mV input
• Crosstalk: Less than -81 dB at 10 kHz
• Gain: 15 dB / 9 dB (RCA in / XLR in)
• Frequency Response: Less than -0.25 dB at 20 Hz - 20 kHz
• Analogue Inputs: 1 pair RCA/Cinch, 1 pair XLR
• Analogue Loop Outputs: 1 pair RCA
• Headphone Impedance: Minimum 8 Ohms
• Power Supply: 18 V / 1 A DC, 110 - 240 V, 50 / 60 Hz
• Standby Power Consumption: Less than 0.5 W
• Colour Options: Silver or black
• Made In: Europe

Weight & Dimensions

• Dimensions: 20.6 x 5.5 x 15.3 cm (W x H x D)
• Dimensions including sockets: 20.6 x 5.5 x 17.0 cm (W x H x D)
• Weight: 0.95 kg without power supply

What’s in the Box

• Pro-Ject Head Box S3 B headphone amplifier
• Power supply
• Product documentation