Fosi Audio PH04 4 Channel Headphone Amplifier

Fosi Audio PH04 4 Channel Headphone Amplifier

What Is Fosi Audio PH04 4 Channel Headphone Amplifier?

The Fosi Audio PH04 is a compact 4-channel headphone amplifier that lets four people listen to the same audio source through separate 1/8'' (3.5mm) headphone outputs at the same time. It accepts a single stereo input and distributes it across four independent output channels, each driven by its own volume control. Built for impedances between 8Ω and 100Ω with a rated output of 40mW at 100Ω, it's designed as a practical audio-distribution and monitoring tool rather than a high-power desktop amp. The unit runs on a 12V 1.5A power supply and measures a small 103 x 57 x 43mm, making it easy to fit on a desk, in a rack, or inside a studio booth.

What Is Fosi Audio PH04 4 Channel Headphone Amplifier Used For?

Its core job is headphone signal splitting with individual volume control. Instead of using a passive splitter that forces every listener to share one volume level, the PH04 gives each of its four outputs a dedicated knob, so one person can listen quietly while another listens louder — all from the same audio feed. This makes it useful for multi-person audio monitoring in recording setups, shared listening stations, classroom or training audio setups, silent-disco style group listening, and any situation where several headphones need to tap into one audio source without a mixer.

Why Choose Fosi Audio PH04 4 Channel Headphone Amplifier?

The main reason to choose the PH04 is independent per-channel volume control combined with a genuinely compact footprint. Many cheap headphone splitters only divide the signal without amplification or individual gain — the PH04 actually amplifies and lets each listener set their own comfortable level. Its small 175g body and simple 12V power requirement mean it doesn't need rack space or complicated setup; you plug in a source, connect up to four headphones, and adjust each channel. For a home studio, small classroom, or shared workstation on a budget, this combination of function and size is the main selling point.

What Are the Most Important Features?

• 4 independent 1/8'' headphone outputs — each channel has its own dedicated volume knob, so listeners aren't locked to a single shared volume.
• Single 1/8'' stereo input — accepts audio from any standard headphone-out or line-out source, keeping setup simple.
• 8Ω–100Ω impedance compatibility — works with the vast majority of consumer and studio headphones, not just low-impedance earbuds.
• 40mW power output @ 100Ω — enough headroom for typical monitoring headphones at comfortable listening levels.
• Compact aluminum-style body (103 x 57 x 43mm, 175g) — small enough for a desk corner, mic stand mount, or equipment bag.
• External 12V 1.5A power supply — stable, low-noise power delivery separate from USB bus power.

How Does It Work?

The PH04 takes a single stereo signal through its 1/8'' input jack and internally splits it into four identical signal paths. Each path runs through its own headphone amplifier stage and volume potentiometer before reaching its output jack. Because amplification happens per channel rather than passively splitting voltage across all connected headphones, plugging in more or fewer headphones doesn't noticeably drop the volume for everyone else — a common problem with passive Y-splitters. The 12V power supply feeds all four amp stages, giving the unit enough headroom to drive headphones up to 100Ω without excessive distortion at reasonable volumes.

Who Is Fosi Audio PH04 4 Channel Headphone Amplifier For?

It's built for anyone who regularly needs more than one headphone connected to a single source with independent control. That includes home and small commercial recording studios where a producer, vocalist, and engineer need to monitor the same mix at different volumes; podcasters and content creators recording multi-guest sessions; music teachers or trainers running small listening groups; and audio hobbyists who want a simple, affordable way to share a turntable, DAC, or PC audio output with friends or family without buying a full headphone distribution amp.

Is Fosi Audio PH04 Good for Studio Monitoring?

Yes, it works well for basic studio monitoring where multiple people need to hear the same feed at their own volume. It isn't a high-power reference headphone amp, but for tracking sessions, voiceover booths, or podcast recording where 2-4 people share a mix bus, its independent-volume design is genuinely useful.

Is Fosi Audio PH04 Good for Podcasting and Content Creation?

Yes, it's a practical, low-cost way to give multiple hosts or guests individual headphone monitoring from one mixer or interface output, without each person needing a separate headphone amp.

Is Fosi Audio PH04 Good for Home and Casual Listening?

Yes, for households or shared spaces where two to four people want to listen to the same TV, PC, or music source through headphones simultaneously, each at their preferred volume, it's a simple plug-and-play solution.

Is Fosi Audio PH04 Good for High-Impedance or Audiophile Headphones?

Partially. It supports headphones up to 100Ω and delivers 40mW at that impedance, which suits many standard studio and consumer headphones, but it is not designed as a high-power amp for demanding, very high-impedance audiophile cans that need significantly more voltage swing.

What Should You Know Before Buying?

The PH04 uses a 1/8'' (3.5mm) stereo input, so sources with only RCA, XLR, or USB outputs will need an adapter or converter cable. It requires its included 12V 1.5A power adapter — it is not USB or battery powered. All four outputs share the same input signal (it is not a mixer, so each channel cannot play different audio). Check headphone impedance against the 8Ω-100Ω range before pairing high-impedance studio headphones. As this listing is currently on Pre-Order at Multimedia Kingdom, availability and delivery timelines should be confirmed directly with the store before ordering.

Where Can You Buy Fosi Audio PH04 4 Channel Headphone Amplifier in Bangladesh?

Multimedia Kingdom offers the Fosi Audio PH04 4 Channel Headphone Amplifier in Bangladesh as an authorized Fosi Audio retailer, with EMI options available through multiple partner banks. The product is currently listed as Pre-Order, so buyers should confirm current stock and delivery timelines by contacting the Multimedia Kingdom sales team before completing payment.

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