Fosi Audio PH04 front panel with per-channel volume controls for precise monitoring
Fosi Audio PH04 back panel showing four headphone outputs and input connectors
Fosi Audio PH04 close-up of per-channel volume knobs enabling independent listening levels
Fosi Audio PH04 ultra-compact footprint fits on a crowded desk for studio or stage use
Fosi Audio PH04 four headphone outputs for monitor distribution during group sessions
Fosi Audio PH04 12V DC power adapter powers reliable operation in studio or stage environments
Fosi Audio PH04 in-use setup with multiple musicians hearing the main mix
Packaging includes Fosi Audio PH04, power adapter, and user manual

Fosi Audio

Fosi Audio PH04 4-Channel Headphone Amplifier | Ultra-Compact Studio & Stage

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$46.83

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Product details

Overview

Meet the Fosi Audio PH04, a four-channel headphone amplifier designed for compact studios and on‑stage monitoring. Each channel includes its own level control, allowing you to tailor the listening mix for up to four listeners without altering the main mix.

What makes it stand out

Engineered for clarity, the PH04 uses independent stereo amplifier sections that preserve detail even at higher listening levels. The upgraded design adds a convenient power switch and a dedicated 3.5 mm output for quick connections across a variety of headphones. For group monitoring in a busy session, this unit provides a practical, money-saving option without compromising sound fidelity.

  • Four independent stereo amplifier sections maintain sonic detail even at higher levels
  • Ultra-low-noise op-amps support clean, faithful monitoring across headphones
  • Dedicated output level controls per channel enable personalized listening
  • Compatibility with 3.5 mm and 6.35 mm headphones via adapter for flexible setups

Compact, flexible, ready to travel

With its ultra-compact footprint, the PH04 fits on crowded desks and portable setups alike. It powers four headphones simultaneously, freeing you from sharing a single cue and reducing setup time for practices, sessions, or live rehearsals.

Included and how to use

What you get: the PH04 amplifier, a 12V DC power adapter, and a user manual. Plug in the power supply, connect your headphones, and adjust each channel to taste. The design supports quick rearrangements for evolving recording or rehearsal needs.

Target scenarios

  • Small studios tracking multiple performers with individual listening levels
  • Rehearsal rooms where each musician monitors the main mix separately
  • Educational settings or client sessions that require clear, independent listening

FAQ

Q: What is the PH04 best used for?

A: It powers up to four headphones with independent volume control, ideal for small studio sessions, rehearsals, or classroom monitoring without shared volume issues.

Q: Does the PH04 require a special power supply?

A: It includes a 12V DC 1A power adapter, designed for reliable operation in studio or stage setups.

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