Tonetech PH400 Professional 4 channel stereo headphone amplifier,

The Tonetech PH400 is a portable, professional-grade headphone amplifier designed for multi-user studio monitoring, live sessions, or group listening scenarios.

Key Features:

Four Independent Channels: Supports 4 sets of headphones simultaneously, each with its own volume control and selectable mute function.

Dual Jack Types: Offers 4 × 3.5 mm and 4 × 6.35 mm jacks – all non‑interfering to allow flexibility in headphone type.

Mono/Stereo Switch: Toggle between mono or stereo output modes depending on the workflow or monitoring needs.

RGB Volume Knobs: Each channel has a 7-color “breathing light” surrounding the knob for visual feedback and added style.

High-Impedance Tolerance: Drives headphones up to 600 Ω with minimal distortion or noise.

Compact Metal Build: Full-metal chassis, ultra-lightweight (~350 g), and small footprint (~146 × 93 × 25 mm) for easy courier use.

Performance & Utility:

Clear & Balanced Audio: Designed for clean, low-distortion output even at high volumes—suitable for studio monitoring or multi-user playback.

Low Crosstalk Wiring: Engineered to minimize channel interference and prevent bleed between outputs.

Stable Power Design: Uses a DC 12V/2A power input for consistent, efficient performance with built-in surge protection.

Ideal Use Cases:

Recording studios or rehearsal spaces where performers need individual headphone mixes.

Podcast or interview setups involving multiple participants.

Group audio monitoring in educational, broadcast, or collaborative environments.