---
product_id: 375052844
title: "Fosi Audio PH04 4 Channel Headphone Amp, Portable Headphones Amplifier Splitter 4 Way for Music Studio, Mixer Audio Sharing Podcast Monitor, Supports 15-150 Ohms with 12V Power Adapter"
brand: "fosi audio"
price: "A$92"
currency: AUD
in_stock: true
url: https://www.desertcart.com.au/products/375052844-fosi-audio-ph04-4-channel-headphone-amp-portable-headphones-amplifier
store_origin: AU
region: Australia
---

# Supports 15-150Ω headphones 4 independent 40mW outputs 4 separate volume controls Fosi Audio PH04 4 Channel Headphone Amp, Portable Headphones Amplifier Splitter 4 Way for Music Studio, Mixer Audio Sharing Podcast Monitor, Supports 15-150 Ohms with 12V Power Adapter

**Brand:** fosi audio
**Price:** A$92
**Availability:** ✅ In Stock

## Summary

> 🎧 Amplify your sound, unite your squad.

## Quick Answers

- **What is this?** Fosi Audio PH04 4 Channel Headphone Amp, Portable Headphones Amplifier Splitter 4 Way for Music Studio, Mixer Audio Sharing Podcast Monitor, Supports 15-150 Ohms with 12V Power Adapter by fosi audio
- **How much does it cost?** A$92 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.au](https://www.desertcart.com.au/products/375052844-fosi-audio-ph04-4-channel-headphone-amp-portable-headphones-amplifier)

## Best For

- fosi audio enthusiasts

## Why This Product

- Trusted fosi audio brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Sleek & Sturdy Design:** Compact all-aluminum chassis blends durability with a modern aesthetic that fits any professional setup.
- • **Plug & Play Convenience:** Comes with a 12V power adapter and 24-month warranty—ready to elevate your audio experience right out of the box.
- • **Quad-Channel Powerhouse:** Four independent 40mW outputs let you share pristine sound with your crew or family without compromise.
- • **Audiophile-Grade Clarity:** Ultra-low-noise op amps deliver crystal-clear sound even at max volume, rivaling full-size studio gear.
- • **Personalized Volume Control:** Each channel has its own knob, so everyone gets their perfect listening level—no cross-talk, no hassle.

## Overview

The Fosi Audio PH04 is a compact, metal-built 4-channel headphone amplifier and splitter designed for professional and personal use. It supports headphones with impedances from 15 to 150 ohms, delivering up to 40mW per channel with independent volume controls. Ideal for studios, live streaming, or shared entertainment, it features ultra-low-noise op amps for high-fidelity sound and includes a 12V power adapter and a 24-month warranty.

## Description

Fosi Audio PH04 4 Channel Headphone Amp, Portable Headphones Amplifier Splitter 4 Way for Music Studio, Mixer Audio Sharing Podcast Monitor, Supports 15-150 Ohms with 12V Power Adapter

## Features

- One-In-Four-Out: Each of the 4 channels can independently output up to 40mW@100Ω, which enables up to four people to monitor the mix for tracking, live use on stage or in streamers' studio. PH04 is also a perfect solution when you and your family and friends want to immerse in the same movie or game.
- Independent Amplification: Equipped with independent level control knobs for each channel, ensuring that adjustments made to one channel do not affect others, allowing personalized volume settings for each headphone, perfectly compatible with a variety of monitor headphones and IEMs with impedance ranging from 15 to 150 ohms.
- Clean Sound, Great Value: The PH04 contains 4 independent stereo high-power amplifier sections that maintain the highest sonic quality even at maximum volume levels. These ultra-low-noise operational amplifiers are included for outstanding audio performance: the same op amps found in "full-size" audio equipment.
- Ultra-Compact Design: This headphone splitter perfectly combines a solid all-aluminum alloy build, exquisite appearance, and enhanced stability. It features four volume controls and a small, neat, compact design that is both practical and stable.
- What You Get: PH04 amplifier*1, 12V DC power adapter*1, Use manual*1. This headphone amplifier comes nicely packaged with a solid feel to the case and the controls and connectors, and you can enjoy the peace of mind provided by Fosi Audio's 24-month warranty.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Package type | Standard Packaging |
| Style | In The Ear |
| Product Dimensions | 10.16 x 5.08 x 2.54 cm; 172.37 g |
| Item model number | PH04 |
| Connector | Stereo Audio, 3.5mm Jack |
| Material Type | Metal |
| Power Source | AC 110V-240V |
| Item Weight | 172 g |

## Product Details

- **Brand:** Fosi Audio
- **Colour:** Black
- **Form factor:** In Ear
- **Model name:** Fosi Audio PH04
- **Connectivity technology:** Wired
- **Included components:** 12V DC power adapter*1, Use manual*1
- **Age range (description):** Adult
- **Material:** Metal
- **Control type:** Button Control
- **Item weight:** 0.38 Pounds

## Images

![Fosi Audio PH04 4 Channel Headphone Amp, Portable Headphones Amplifier Splitter 4 Way for Music Studio, Mixer Audio Sharing Podcast Monitor, Supports 15-150 Ohms with 12V Power Adapter - Image 1](https://m.media-amazon.com/images/I/61PnqbMIBDL.jpg)
![Fosi Audio PH04 4 Channel Headphone Amp, Portable Headphones Amplifier Splitter 4 Way for Music Studio, Mixer Audio Sharing Podcast Monitor, Supports 15-150 Ohms with 12V Power Adapter - Image 2](https://m.media-amazon.com/images/I/71S2GrxuKBL.jpg)
![Fosi Audio PH04 4 Channel Headphone Amp, Portable Headphones Amplifier Splitter 4 Way for Music Studio, Mixer Audio Sharing Podcast Monitor, Supports 15-150 Ohms with 12V Power Adapter - Image 3](https://m.media-amazon.com/images/I/81cGmLMb0IL.jpg)
![Fosi Audio PH04 4 Channel Headphone Amp, Portable Headphones Amplifier Splitter 4 Way for Music Studio, Mixer Audio Sharing Podcast Monitor, Supports 15-150 Ohms with 12V Power Adapter - Image 4](https://m.media-amazon.com/images/I/71NIXLlzweL.jpg)
![Fosi Audio PH04 4 Channel Headphone Amp, Portable Headphones Amplifier Splitter 4 Way for Music Studio, Mixer Audio Sharing Podcast Monitor, Supports 15-150 Ohms with 12V Power Adapter - Image 5](https://m.media-amazon.com/images/I/71brDdeb7tL.jpg)

## Questions & Answers

**Q: Will this device switch microphone inputs as well? I play to connect this to a laptop to switch between headphone/mic inputs.**
A: You should look into mixers? Mixers have multiple inputs and one output for speaker. It has a jack for headphone.

**Q: Does have to plug into the tv or use Bluetooth**
A: You plug the speaker output on your TV or computer to the Input then you have the availability to plug in external speakers or headphones.

**Q: My speakers and headphones make pop-noise whenever turning it on, Can I just leave it on with the lowest volume when not using it?**
A: The reason for the popping noise when the amplifier is turned on is that it does not have a capacitor in line with the power supply.  The amplifier produces sound through electrical current, so the initial surge of electricity when the device is turned on, causes a kind of signal to be forced through to the headphones.

In theory, such a thing could cause damage to a speaker, if the "signal" overloads the power ratings of the speakers, but in practice, this is not very likely, especially for an amplifier like this one.  The bigger issue, to my mind, is that if you're wearing headphones and the volume is turned up, you may expose your ears to a rather loud pop, which could be harmful.

So, yes, you could avoid the problem by not turning the unit off but only turning the volume down.  I would still recommend, however, the step of putting your headphones on only after you have plugged them in, and if you do turn the amplifier off, putting your headphones on only after you have turned the unit back on.

**Q: I bought 8 of these and we have tried several. And we have tried using difference stereo cables. No matter what we do left side only??**
A: Mine works fine.
Please check the source, sometimes happens that there is the problem with the setup. Just put some basic headphones with volume and check that the source is sounding fine, complete

## Frequently Bought Together

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*Product available on Desertcart Australia*
*Store origin: AU*
*Last updated: 2026-01-25*