Fosi Audio P2 Headphone Amplifier Review 

The Fosi P2 headphone amplifier is a pretty popular amp. Why not? It’s impressive! Don’t believe it? How about you read this Fosi headphone amplifier review and maybe you’ll change your mind. 

fosi audio p2

No need to waste your time on research, we did it for you. Features, specs, pros, cons, reviews, it’s all here! What more can you read? Now, enough talking. Let’s go see that review. 

Amazing Sound

Fosi headphone amplifier offers an amazing sound quality, which is the whole purpose of buying a headphone amp. 

This amp offers a clear, undisturbed sound. Say goodbye to buzzing sounds, ringing, and ground noise. Yes, it’s possible with this amp. All you’re going to be able to hear is the sound of your music, no background can hinder that. 

Fosi designed this amplifier with audiophiles in mind. Their goal was to create the ultimate headphone amp to satisfy music-lovers. 

Do you want to know how awesome the sound quality is? It’s HiFi-awesome. Thanks to the P2 tube, which is a high fidelity tube, this amp achieves sound-zen. 

The 6K4 J-grade tubes work with the P2 tube to not only produce crisp sound, but also power high-performance headphones with no trouble. 


Fosi headphone amplifier isn’t just an amplifier that boosts sound a little bit, it’s more. It’s also a practical amp. 

Remember these tubes we talked about earlier? As impressive as they are, they can prove to be a nuisance. If you’ve owned an amplifier before, then you know what I’m talking about. If anything ever happens to them, where does that leave your amp?

Thanks to the versatility of this one, it leaves your amp functioning with minor replacements. Yes, you can easily replace these tubes with ones you can find anywhere. It isn’t exclusively designed for these specific tubes, which means you don’t have to throw it away! 

Now, let’s get to the fun part! Do you know what’s better than a headphones amp? One that can also work as a stereo preamplifier! Admit it, you’re impressed now, aren’t you? 

In addition to its parallel 3.5 mm, RCA stereo inputs, as well as its 6.35 mm headphone output, it comes with a 6.35 mm to 3.5 mm adapter. So blast that stereo! It will be as if you’re living inside a boombox! 

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  • Dimensions: L 99 mm x W 98 mm x H 33 mm
  • Net Weight: 0.55 Lbs
  • Tubes: P2, 2 6K4 J-Grade tubes, and 6J4 vacuum tubes
  • Frequency: 20 Hz – 20 kHz (+3dB)
  • Output: 6.35 mm headphone jack
  • Audio Input: 3.5 mm audio jack and stereo RCA
  • Input Sensitivity: 0.2 mV
  • Voltage: DC12V
  • Operational Amplifier: NE5532
  • Total Harmonic Distortion: ≤0, 03%


Now, let’s break down what’s good about this amp besides its amazing sound quality and practicality. 

For one thing, it won’t damage your headphones! How awesome is that? Your expensive headphones are safe with this one. It’s reinforced with an output-protect circuit that’s built-in, making it completely safe for headphones.

For another, have you seen how tiny it is? Fosi headphone amp isn’t one of those amplifiers that have an imposing built. It’s pretty small, making it very versatile. You can take it with you if you’re constantly on the move, it won’t be a problem!    Like the Bravo Audio, this amp is great for use with turntables.

Don’t let its littleness fool you though, it can take a hit or two. Thanks to the all-aluminum alloy shell, it’s pretty durable. You don’t need to be terrified about dropping it all the time, but obviously don’t go throwing it around either! 

So, what happens if you accidentally drop it? Luckily, it comes with a warranty from the manufacturer. The 18-month warranty should ensure your amp’s safety for more than a year.


So, what is the catch? 

The manufacturer warns that overheating is pretty normal. If you have the amp on for a while, it’s normal if it grows hot. But don’t worry about it, it isn’t harmful and shouldn’t be harmful so long as you keep your hands by your side until it cools. 

Fosi also states that it’s better to use 32~300Ω headphones over armature earphones or low-resistance and high-sensitivity headphones. Why you might ask? They’re not compatible with this amp. 

This might be a bummer for some people if these are the headphones you own. Perhaps this isn’t the amp for you after all. 

Unlike their P1 model, this amplifier doesn’t offer bass and treble control. This can be a letdown to some people. What makes up for it is the fact that the sound quality is pretty close to being perfect already. Some might say it’s not necessary. 

What Customer Reviews Say

What’s the word on the street about this amplifier? 

Fosi headphone amplifier rates 4.1 out of 5 stars. 56% of those reviews are 5-star ratings, while only 10% are 1-star ratings. 

Fosi headphone amp is a great buy for its value. People love how amazing sound quality they get for paying so little. You don’t need to spend a hundred bucks to get this quality. 

Not only does it sound great, but it reduces background noise. This, in particular, seemed to impress several reviewers. 

Bottom Line

The P2 is a pretty impressive little thing. 

It zeroes in on the sound of your music, giving you a smooth, uninterrupted sound. You don’t need to blast the volume to feel as if you’re living inside your music anymore, thanks to its brilliant sound quality. 

The fact that you can use it with your stereo makes it even better. Just imagine having the pure, filtered sound of your favorite tracks blasting through the room. Who wouldn’t want that? 

So basically, you get amazing sound quality, practicality, versatility, and durability in one tiny, affordable package. It might have some setbacks, but not everyone will be bothered by them. 

We hope we’ve brought you closer to your decision! 

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