Fosi Audio P3 Tube Preamp Headphone Amplifier Home Audio Preamplifier Mini Vacuum Pre Amp Receiver with Bluetooth aptX LL HD Bass Treble Tone Controls for HiFi Stereo Active Speakers with RCA AUX Jack

This made a huge difference in sound for me. Paired with my sound card on my computer and a set of Sony MDR-7506 headphones this makes a formidable combo. I also really like the fact that I can swap between pc audio and bluetooth with a switch and listen to just about anything.

The bluetooth connection is easy has great quality look. Has a good power ability. Provides great sound quality and clarity for the price.

I love how simple this little pre-amp is. The unit boast decent specs too, with SNR above 103 db. The volume and tone control knobs are small, but even my big hands manage to use them OK. The tone controls are not linear, but are useful once you get used to using very small adjustments, and work very well and very silently. The main reason I was attracted to this particular unit was that it had BlueTooth 5.1, which is a big sonic improvement, now that I've heard it. Auto pairing can be a bit of a bother if you use your phone's bluetooth for other things. At this price this little Fosi Audio P3 is both a bargain and a sonic suprise, worth every penny.

Pros: I have been a musician and music fan for my entire life. I have a substantially large music collection of many different genres. I’m one of those people who listens to the entire album with headphones or sitting in the center between two speakers, reading along with the lyric sheet. Sound quality and production are very important to me. I prefer studio recordings vs. live recording for that reason alone. Lets just say I’m a wanna’ be audiophile. When I received my Fosi P3 it changed the entire listening experience for me. I don’t know if it’s the tubes and the chips that give the music a spacial and more separated, clearer stereo sound. But whatever it is, Fosi got it right! I’m using it as a pre amp for my old Sony receiver which I never really was happy with the sound of, and now the Fosi P3 has improved the sound 100%. The clarity and spacial separation of hearing each instrument individually and and every little nuance in the production of a recording is truly brilliant and amazing. I run the Fosi’s output to the input of a channel on the Sony with bass & treble on the Sony in the flat position. So I only use the amp part of the Sony for power. I have the volume of the Sony at the two o’clock position. I use the Fosi’s delicate and accurate volume, bass and treble controls only. If you move these controls ever so slightly you can hear a substantial difference in eq. The bluetooth is perfect and connects immediately to my iPhone with no drop outs, static or interference. I intend to have a Fosi in every room of my home. Features I would like to see in Fosi’s future are multiple inputs and a remote control. Did I mention how great headphones sound in the Fosi? A new and surprisingly wonderful experience altogether. Another cool feature is when you plug in headphones, it mutes the speakers. I myself love this feature. I could go on and on but I’ll just say, you will not find a better way of listening to music for under one hundred dollars. If you really love and listen to music like I do, buy the Fosi P3, You won’t be disappointed. Btw, I now have 3 of these little amps. The same one in all 3 separate rooms Cons: Only 1 Input. No Remote. The tubes are difficult to insert. Fosi support was outstanding and sent me a video of unscrewing the gold rings out before inserting the tubes by even just unscrewing the gold ring was very difficult to unscrew and screw back in. Then the tubes are even more difficult to insert. I followed Fosi's instructions but the tube pins are definitely crooked and don't line up perfectly with the holes. You have to keep bending the pins carefully to get them to all fit in and when you do finally get them to line up the tubes have to be pressed down so hard that you feel you might break them. I took me almost 30 minutes to get 1 tube in. After buying 3 of these preamps, the tube insertion did not getting any easier, I have to say Fosi need to address this issue. Update 1-26-26 : I own 3 of these units and have found the Headphone Jack in all three have the Left & Right reversed. So what should be in the right ear you should be hearing in the left ear.

I have been a very satisfied buyer of Fosi components for quite some time, and the P3 is the latest in a long line of pleasing purchases. I have the P3 on a nightstand and use it for one purpose only, which is to listen to Bluetooth audio from my bedroom TV, smartphone, and WiiM Ultra streamer through wired headphones (BeyerDynamic, closed back, 250 ohms). It performs flawlessly. I generally dislike Bluetooth, but the tube stage in the P3 warms it up nicely, along with the the subtle adjustments one can make with the bass & treble controls. The GE tubes that Fosi includes are top notch. Hint, leave the P3's volume control wide open at 100% and attenuate the volume from your Bluetooth source for the best result. My only suggestion to Fosi would be to revise the layout of the controls to match the Fosi GR40, (bass left, treble right, volume knob spaced to the right of the tone controls) for a more intuitive and user friendly experience. But that is a very minor grumble. The P3 is a great value at the listed price. Clear and transparent sound with Bluetooth harshness beautifully tamed by the lovely vacuum tubes, and enough oomph for 250 ohm headphones. It truly rocks. Highly recommended!

This amp suits my needs perfectly. I wanted an amp for my headphone for use with phone/ tablet as well as a CD player. This does just that, and I think it has a warm, rich sound. If you give this amp a good source and reasonable headphones, it will deliver good value. And it

Changed my whole system! Beautiful warm tube sound but still can hear highs with detail. Cant go wrong for the price...it punches far above its low cost!

The good: Fosi P3 could sound great and has plenty of power for a high amperage headphone when it's working correctly. The bass & treble controls gently shape the highs and lows giving just enough control to tune your headphone to personal preference. An almost perfect product, ruined by the problems I mention next: The bad: I have serious interference issues with the Fosi P3. Not just being near a router, but any device. Computer monitor. PC. Electrical outlet. It gets interference, and while you don't usually notice it during the loud part of a song - it's there underneath and you hear the weird blippy communication sounds between songs or in the quiet part of a song. And then there's the Bluetooth issues. If it is about 1 foot from your Bluetooth device then it works. Sitting your phone or iPad next to the Fosi P3 will give it an adequate and consistent Bluetooth connection... But without exaggeration -- by the time you're 2-3 feet away, you get intermittent dropouts and Bluetooth loses its connection. These issues make the P3 a regretful purchase for me.