Fosi Audio P3 Bluetooth Tube Preamp, Headphone Amplifier for Home Audio

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.

The install goes between my phono preamp and my amplifier. The bluetooth installation populated my apple tv immediately and the music coming through had a clear, warm sound. When I played some vinyl, the separation and music clarity was awesome in my 80’s bookshelf JBLs. The background noise levels were very low considering I was wearing open back headphones listening to an album. It filtered out the harshness commonly heard from records. The biggest improvement is that warm, well rounded sound that the NOS GE JAN 5654w tubes produce. The tubes actually affect the sound on this unit as you have to wait 20-30 seconds for them to warm up. The tubes aren’t just for looks like some other units i tried. It looks cool with the vacuum tubes lighting up and going from dim to bright as they warm up. The quality is very good as the chassis and knobs are aluminum with a definite detent for volume, bass, and treble. It’s easy to use with a flick of a switch you switch from your bluetooth source to your vinyl. I must say the customer service was stellar. There was a problem with the vacuum tubes but they responded and sent the replacements from mainland China. It was shipped immediately but obviously took some time but it was worth the wait. The only thing I would change is to have the sub out active when headphones are attached so i can activate my exciters in my recliner for bone deep bass. Without the phones attached the sub out is obviously active. I would highly recommend this headphone preamp if you want to take the “shrill” edge off your digital music and enjoy vinyl with low noise and a full sound.

I may not be using this in my system to it's full extent, or as intended, but the Fosi P3 is doing exactly what I need it to do. No need for the Bluetooth, not using the tone controls or the volume control... BUT I needed to take the edge out of the top end of a Fosi BT20A Pro. While I've been very happy with the BT20A Pro, certain tones in the upper octaves can catch you by surprise... a little clangy, zingy, edgy (worsened by the speaker I use). I went with the P3 because I read so many times over how it's well paired with Fosi amps. Inserting the P3 between sources and the BT20A is all it needed. Edge rounded off nicely! BUT there's more! Unexpectedly, the P3 has brought more fullness to the sound from bottom to top. Instrument separation is clean... focus is tight. Class D amps get a rap for vocals being forward. I notice the depth is back a bit more now... vocals seem more precisely placed in the sound stage. I was using tone controls but I am now back to flat, where it "should" be. Now tone controls add juice instead of getting it to flat... flat is flat now. I don't know how "tubey" this bugger is... it's not "yummy" or "syrupy" or whatever the audiophile head words are... it took the edge off and left all of the precision and beefed up the bottom and top. For me, a fantastic addition to the kit. Why no tone controls or volume control? I'm glad you asked... I use a WiiM Pro Plus as a hub of sorts. That way I can control volume and use the EQ in the awesome WiiM app. Fluance RT 82 with an AT VMN30EN cart upgrade, into an iFi Zen phono, into the WiiM... clean pass through RCA to Fosi P3 and finally RCA into Fosi BT20A Pro with Sparkos SS3602 op amp upgrade. Streaming and phono go through the P3. The BT20A feeds Sony SSCS5 and Elac 1010 Sub (crossover is about 70) very nicely. Someday I'll upgrade that Sony, but for now, it works well for me. Full recommendation for this Fosi P3 use case. I'll also add that the biggest impact upgrade in the kit was the Sparkos op amps. Those little bad boys do amazing things for class D amps.

I have only run for 48hours. Just to break in. The tubes issued are very good. But feel there is way to much gain. I tried some 403b and 6J1 also RCA 6ak5w tubes. These we're already broke in. Just wasn't happy. I swapped out all for M3622/6au6a tubes. I think I might have hit something good. Sounds better and not trying to override itself. Plus now feels like you have more control over volume. There doesn't seem to be much use for tone controls. Treble seems to do more than bass. But like said there isn't a lot of time on this unit yet. One complaint that has been mentioned by others is the tightness in putting in the tubes. One went fairly easy and the other one was a bear. Had to straighten out the pins more than once. Could make one nervous. Other complaint for me,not others is the brightness of tube leds. Kinda wish one could shut off. Build quality I think is quite good. Sound is not bad overall. Hearing is a subjective thing. Controls are way to close to each other but do turn easily. The headphone jack is to close to the bass control. But one does have to take into account how small the unit is. One can only have so much space . I think for eighty bucks it is a good buy.

I am pleasantly surprised at the overall sound quality, power and character this little compact device added to my system. I’m currently running the Audio Technica AT-LP60X turntable with the Édifier-R1280db bookshelf speakers and if you’re looking to add a little warmth and upgrade the overall sound quality of your system without breaking the bank this is a sold option. It’s an outstanding, inexpensive upgrade for any modest setup. It looks pretty cool too.

I bought an Audio-Technica record player a while ago along with some powered speakers, but they weren't providing the sound I was looking for. Even though the AT turntable has a preamp, it just wasn't delivering the full sound I wanted. I kept seeing recommendations for preamps, so I took a chance with this one. I am so glad I did!! This preamp made a huge difference in adding the bass and punch my system needed! How much of a change did this make? I'll put it into perspective. Imagine having a lamp with a 25-watt bulb and then you switch the bulb out with a 75-watt bulb. You end up with a much brighter and better light that makes everything brighter and easier to see. Now, back to the preamp, adding this made the music brighter, and fuller and increased the bass!! That alone is amazing, but this preamp also has a headphone jack and Bluetooth! I can play music from the turntable or my phone or iPad through it and it sounds incredible! I was considering adding a subwoofer before I bought this preamp, now I'm wondering if I even need one since this added the low-end sound my system was lacking. Yes, it improves the sound that much...well, to me anyway. The small tubes that it comes with are not installed when you get the preamp, so you have to install them yourself and it can be a little bit of a challenge to line up all the prongs, but it's worth it. One of the tubes went in fairly easily and the other tube took a little while to get all the prongs lined up to fit in the holes, but I'm very happy with this purchase. If you're looking for an affordable tube style preamp, give this one a try!

Upgraded the tubes and I love the pure sound of this tube pre-amp. Using optical connections into low end powered speakers gives me all the tonal control needed to customize this system to articulate the sounds of movies as well as music. Love it!

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!

Uzun zamandır fosi audio ürünlerini satın alıyorum. Zamanından önce teslim ettiği için Amazon'a ve de kaliteli ürünleri uygun fiyatlarla sattığı için fosi audio ' ya teşekkürler. Bu cihazı; Fosi' nin BT20A pro amfimin çokta parlak olmayan sesine katkı sağlar ümidiyle aldım. Genelde yorumlarda V3 ile eşleştirenlerin yorumlarıni görünce satın alırken biraz tereddüt ettim. Çünkü bu amfilerin zaten bir preamfi özellikleri vardı. İkinci bir ön amfi ile nasıl eşleşir endişesi taşıdım. Ama sorun olmadı. Bağlantılarını yaptım ve çalışmasında herhangi bir sorunla karşılaşmadım. Bu cihaz, BT20A pronun sesini daha açık hâle getirdiği gibi bas ve tizlerde de belirgin bir iyileşme sağladı. Bazı yorumların aksine tüpleri yuvalarına yerleştirmek iki dakikami aldı ve takarken hiç zorlanmadım. Bu arada bir tespitte bulunmakta yarar görüyorum. Bu cihazlar küçük ve her bağlantıyı bu kutucuğa yerleştirmek zor olabilir. Ancak yine de preamfi katıni daha kaliteli yaparak ve fiyatını o oranda yüksek tutarak insanların sürekli başka cihazları satın almak zorunda bırakılmaması yararlı olur diye düşünüyorum. Ancak bu tespit ve öneri; Fosi' nin işine gelmeyebilir. İlave özellikleri olan cihazları üretmek ve çeşitlendirmek günümüzün bir satış politikası olabilir. Ama yine de fiyatı biraz yüksek tutarak daha entegre edilmiş ve ses kalitesi artırılmış cihazlar üretmekte iyi bir pazar yaratabilir.

j'écoute la musique sur Deezer et mon PC + Dac Q6 fosi + Préamplificateur P3 fosi + Casque AKG K240 studio.... Que dire... Du bonheur. Qualité/prix fosi imbattable. Ah, j'oubliais,... enceintes actives Argon audio Forte MKII + 2 caissons de grave... Tout ça pour écouter sans casque évidemment... Encore que du bonheur... Voilà, voilà,... Que la musique est bonne.

Fosi P3 Calidez analógica. El último lanzamiento de Fosi Audio se trata de un previo a válvulas que añade una calidez que parecía perdida en el actual mundo digital ¿Qué nos ofrece el P3? Se trata de un previo analógico que permite la conexión de un dispositivo con señal de línea RCA y un dispositivo bluetooth, el P3 incorpora versión 5.1 Estéticamente se trata de un conjunto bien conseguido, donde las válvulas de vacío destacan en la oscuridad gracias una discreta iluminación de tono azul. En el frontal dispone de un selector de palanca que nos permite la desconexión del dispositivo y la selección de fuente, un guiño a los selectores de hace unas décadas. Además, dispone de un control de graves y agudos que permite ajustar el tono de la señal, una muestra de su calidad es que tanto en su posición mínima o máxima la señal no es distorsionada, recordando la ecualización de las mesas analógicas de alto nivel. En cuanto a salidas dispone de salida de auriculares en formato 3,5 mm. salida rca procesada por las válvulas y una salida aux. en formato 3,5 mm. para alimentar un sistema aux o subwoofer. Los datos de la salida para los auriculares son los siguientes RMS Power: 250mw @16Ω；150mw @32Ω；32mw @250Ω；20mW @300Ω Headphone Impedance: 16-300Ω Para las pruebas de auriculares he utilizado los Sennheiser HD25 y los Fidelio X2HR, consiguiendo un alto nivel de salida sin distorsión. Un detalle a tener en cuenta es que al activar la salida de auriculares desactiva la salida de línea del P3. La señal de línea del P3 puede alimentar tanto altavoces activos como conjuntos amplificador/altavoz pasivo en ambos casos aporta calidez a la señal. El tamaño del P3 es idéntico al amplificador V3 de la misma marca, permitiendo una instalación en conjunto y dotando al V3 de controles de tono y fuente. El tamaño permite tanto una instalación permanente, como una agradecida portabilidad que permite ubicarlo en diferentes áreas. ¿Para quién está indicado? Apasionados del sonido en general y uso de auriculares. Es una pareja perfecta para combinar con DAC`s sin salida de auriculares, mejorar la calidez de conjuntos con un sonido seco y amantes de la personalización del sonido ya que permite el empleo de una amplia gama de válvulas de vacío de 7 pines. La relación calidad/precio inmejorable como eslabón de la cadena de audio y unas muy buenas características técnicas.

Fick min Fosi P3 idag. Oerhört kompakt format, väldigt bra finish på produkten. Skruva av kopparringarna innan du kopplar i rören. Det underlättar betydligt. Bra och och välfungerande bas-diskantkontroller. Bra känsla i reglagen. Den ser riktigt tuff ut med de glödande rören och ett blått "bakgrundsljus" i röruttagen. Även jacket till hörlurarna är upplyst med blått ljus. RCA ingång med RCA och AUX utgångar. Jag använder den i samband med konvertering av vinyl till digitalt format. Skivspelaren är kopplad till en Behringer 204. Mycket nöjd med den med. Alltsomallt, mycket nöjd med köpet - båda tummarna upp.

good bluetooth connectivity and mediocre sound processing ... I use mine in line with the X2 preamp for my turntable. Well built