Pro‑Ject Head Box E – Compact Discrete Headphone Amplifier

The Head Box E is a micro-sized yet powerful headphone amp designed to elevate your listening experience. Packed into a durable metal chassis, it delivers 665 mW into 32 Ω using fully discrete circuitry, making it a standout upgrade for both desktop setups and home hi‑fi systems.

Key Features

• 665 mW output @ 32 Ω: Plenty of clean power to drive demanding headphones—removes the limitation of weak headphone jacks
• Fully discrete amplifier design: Uses non-integrated components for superior signal control, repairability, and audio purity
• Dual headphone outputs: One 6.3 mm and one 3.5 mm jack, usable simultaneously for shared listening
• Line-level bypass option: Rear RCA input plus loop-out lets you integrate the amp into your stereo chain without losing signal
• Low distortion & high fidelity: THD+N <0.005%, SNR −105 dBV, frequency response 20 Hz–80 kHz (±0.2 dB)
• Compact and light: Just 10.3 × 3.7 × 12.0 cm, 0.39 kg – small enough to fit on any desk or shelf

Customer Benefits

The Head Box E brings studio-grade headphone amplification to your desktop or living room. Its robust power suits a wide range of headphones, while clean, low-noise output enhances clarity and musicality. The dual jacks support shared listening, and the loop-out feature makes it easy to slip into your existing audio setup.

Quick Specs

• Output power: 665 mW @ 32 Ω
• Frequency response: 20 Hz–80 kHz (±0.2 dB)
• THD+N: <0.005%
• SNR: −105 dBV
• Gain: 11 dB
• Crosstalk: 65 dB
• Output impedance: <1 Ω
• Headphone jacks: 6.3 mm and 3.5 mm (usable simultaneously)
• Line-level I/O: RCA input + loop output
• Power: 5 V/0.5 A DC via included USB cable
• Standby power: <0.5 W
• Dimensions: 10.3 × 3.7 × 12.0 cm
• Weight: 0.39 kg (without power supply)

What’s in the Box

• Pro‑Ject Head Box E amplifier
• USB power cable (5 V DC)
• Protective pouch

Use Cases / Ideal For

Perfect for audiophiles seeking a powerful desktop amp, vinyl listeners adding headphone capability, and anyone wanting shared listening with two jacks—clean, portable, and simple amplification.

Compatibility

Connects to any line-level source (DAC, CD player, turntable with phono stage) via RCA. Compatible with headphones from 8–600 Ω. Fits seamlessly into hi-fi chains with bypass output.

Pros & Cons

✅ Pros:

• High clean power in a compact form factor
• Discrete circuit design for superior audio performance
• Dual jacks allow shared listening without adapters
• Loop-out lets you integrate it into larger setups

⚠️ Cons:

• No DAC built in—requires external digital source
• No balanced or digital inputs
• Relies on USB adapter—no included plug-in PSU

The Pro‑Ject Head Box E delivers compact, powerful, and clean headphone amplification in a sleek metal body.