5.0 out of 5 stars Fosi Pre Amp Review

2026-01-13    -Jeff Manke

For under 100 bucks, it surpasses my expectations. I appreciate the 3 RCA inputs, the Gain adjustments, which make an audible difference, in my opinion.Also, the ability to bypass the tone controls. Fit and finish seems better than the price. Also, the Volume control is a nice feature. And for my use, it makes sense!

5.0 out of 5 stars A preamp you can't pass up.

2025-12-31    -redjr

I got many audio chifi products I use in many system around the house. II didn't jump on this right away after it was released, but should have. I was looking for a small analog preamp and as soon as this was available again I bought one. It was just the small preamp and had the connectivity that I needed at one of my workstation areas. I allows for 3, RCA inputs, bass and treble controls and even a gain switch (3,6,9dB). One note is, even at the lowest gain setting the preamp has plenty of output, and you may never need to adjust it - especially with many DAC outputs that already output of 2+ volts.If you need a small preamp with extra power output, I highly recommend the Fosi Audio P4 preamp. It's a real value priced product, and a steal at $99.

5.0 out of 5 stars Good stuff!

2026-02-26    -Tom S

Um. It's great. Does not add any color or sound. It's just there. I'm using it with a couple of Fosi ZA3's. One for each channel. There is total silense. And, I have never heard better uncolored audio. No distrtion. So, Ha! I am a total believer in Fosi. Try it! You will like it!

Sounds Better than Bose!

2025-12-26    -Brian Pereira

The media could not be loaded. I am an audiophile and have a collection of audio CDs.Since they no longer manufacture or sell boomboxes, and it is difficult to find someone who repairs CD players, I was long searching for a great sounding system costing less than Rs 50K.So I bought a Philips CD player in Singapore.It sounded awful on the soundbar and TV.Next I bought a pair of Edifier R1110 active monitors. But there were too loud and the treble was average.To improve the sound I bought the Fosi P4 preamp.The P4 has three gain modes. 3db, 6db, 9db. Depending on how much loudness you want. But please be careful and start with the lowest 3db or your speakers might distort or blow.3db is loud enough for my Edifier R1110's in my bedroom.The remote and motorised volume knob is awesome! A touch of retro!I only hope it does not get spoilt over time.Go for the Fosi's. They can also be coupled with your old boombox speakers that are gathering dust under your bed!A fantastic investment! Thank you Fosi.

5.0 out of 5 stars A preamp you can't pass up.

2026-01-20    -redjr

I got many audio chifi products I use in many system around the house. II didn't jump on this right away after it was released, but should have. I was looking for a small analog preamp and as soon as this was available again I bought one. It was just the small preamp and had the connectivity that I needed at one of my workstation areas. I allows for 3, RCA inputs, bass and treble controls and even a gain switch (3,6,9dB). One note is, even at the lowest gain setting the preamp has plenty of output, and you may never need to adjust it - especially with many DAC outputs that already output of 2+ volts.If you need a small preamp with extra power output, I highly recommend the Fosi Audio P4 preamp. It's a real value priced product, and a steal at $99.

5.0 out of 5 stars Great little preamp

2026-02-07    -Sascha Tieke

Great little preamp to work perfectly with my final amp. Especially like the variable output adjustment

中華アンプ侮れない

2026-01-22    -カサピエトラ

音質はとても良いと思います。トーンコントロール、ゲイン切替、リモコンも使えて、この価格とは驚きです。

Awesome !

2026-02-12    -Jun3rd

I love fosi, P4 match with ZP3 and V3 monos, awesome! Great in sound quality!

Excelente preamplificador!!!

2026-02-28    -ERNESTO HERRERA MOLINA

Es un amplificador con calidad, prácticamente con cero ruido blanco (hiss) perceptible al oído humano, su rango dinámico es muy amplio, sus salidas son suficientes hasta para 4 dispositivos, lo uso con un amplificador iFI, su desempeño es excelente con omdin bypass, su capacidad para darle tonos agudos y graves es moderada, lo que facilita el manejo de los agudos y graves con las funciones del amplificador iFI, así que te permite ajustar a tu gusto muy personal la música que prefieres, ¿Considero a FOSI, como una buena marca? Si, definitivamente si, lo probé con altavoces Klipsch y con audífonos Senheiser, quede completamente satisfecho con su desempeño, creo que si gama de precios cumple con su promesa, no necesitas pagarucjonpara disfrutar de un buen sonido Hi Fi, si eres un usuario que busca perfección probablemente no es tu marca pero si quieres diversión y entretenimiento escuchando tu música es perfecto para entrar a la audiofilia, concluyo mi opinión: muy bueno y no lo digo solo yo, muchos usuarios más lo dicen.

5.0 out of 5 stars Exceeded my expectations for the price.

2026-02-18    -Eric Geyer

Really impressed with this. Was thinking about getting a Schiit SYS for half the price, but by the time you factor in shipping the Fosi was close and much more versatile. Good build quality, remote, volume control, and it looks nice. I use it in my garage to run a pair of JBL powered monitors.