Pro-Ject Head Box S3 B – Fully Balanced Headphone Amplifier

The Pro-Ject Head Box S3 B is a high-performance headphone amplifier designed for listeners who demand precision, clarity, and control. Built around a true fully balanced topology, it supports both balanced and single-ended headphones while integrating effortlessly into desktop and hi-fi systems, delivering refined, low-noise amplification with audiophile accuracy—available through Soundium.

Key Features

• Fully balanced signal path: Maximises channel separation and reduces noise for cleaner, more precise sound reproduction
• Balanced and single-ended headphone support: Compatible with 4.4 mm Pentaconn, 4-pin XLR, 6.3 mm, and 3.5 mm headphone connections
• RCA and XLR analogue inputs: Seamlessly integrates with both balanced and unbalanced source components
• Optimised power output: Carefully tuned to drive a wide range of headphone impedances without sacrificing sound quality
• Full aluminium chassis: Rigid, shielded enclosure enhances durability and protects sensitive internal circuitry

Customer Benefits

Head Box S3 B allows headphones to perform at their full potential by combining balanced amplification with controlled output power. The result is improved imaging, tighter bass, and greater detail, whether you are using high-impedance studio headphones or modern low-impedance designs, all within a compact and elegant form.

Quick Specs

• Dimensions: 20.6 x 5.5 x 15.3 cm
• Weight: 0.95 kg (without power supply)
• Max output power: 820 mW (32 Ω), 320 mW (300 Ω)
• Headphone impedance support: Min. 8 Ω
• Inputs: RCA, XLR
• Headphone outputs: 3.5 mm, 6.3 mm, 4.4 mm balanced, 4-pin balanced XLR

What’s in the Box

• Pro-Ject Head Box S3 B headphone amplifier
• External power supply

Use Cases / Ideal For

Ideal for audiophiles, headphone enthusiasts, and desktop hi-fi users who want balanced headphone amplification with flexible connectivity. Well suited for critical listening, home studios, and high-quality personal audio setups.

Compatibility

Compatible with balanced and single-ended headphones and analogue source devices via RCA or XLR outputs, including DACs, streamers, and preamplifiers.

Pros & Cons

✅ Pros:

• True fully balanced amplification at a compact size
• Supports a wide range of headphone connections
• Excellent channel separation and low noise floor
• Solid aluminium construction with refined design

⚠️ Cons:

• No digital inputs or internal DAC
• Single analogue loop output only via RCA

The Pro-Ject Head Box S3 B sets a high benchmark for balanced headphone amplification in its class. With precise engineering, flexible connectivity, and a focus on pure sound quality, it is a compelling choice for serious headphone listening—find it at Soundium.