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Fosi Audio Fosi Audio P4 Mini Preamplifier
- Triple RCA Inputs
- Bass, Treble, and Gain Control
- Motorized Pot for Smooth Adjustment
- Bypass Function for Pure Signal Path
- Op-Amp RollingSS3602, MUSES02, OPA2134PA
Fosi Audio P4 Mini HiFi Preamplifier
Equipped with triple inputs, tone control, and remote control for a convenient and customizable audio experience.
Another Masterpiece Driven by Voice of Customers
The P4 is a mini preamp self-developed by Fosi Audio based on extensive feedback from users worldwide after the launch of the V3 stereo amp.
- Input: RCA x3; Output: RCA, Pre-Out
- SNR≥ 110dB; THD+N≤ 0.003%
- Frequency Response: 20Hz-20kHz(±0.1dB)
High-Precision Motorized Analog Pot
Offer smooth volume adjustment while reducing noise and distortion for a purer soundscape.
Pre-Out Port
Expandable connection for powered subwoofers/powered speakers.
3-Level Gain Adjustment
Match different output levels from audio sources for improved sound quality.
Tone Control Bypass
Bypass the tone control circuit to enjoy the purest high-fidelity sound.
Enjoying a Convenient Audio Experience
Easily adjust the volume, switch sources, and control the tone without leaving your seat.
P4 & ZP3 Comparison
Thinking about a new preamp? Let’s line up P4 and ZP3, and see what makes each one special.
- Mini Control Hub: The P4 supports up to 3 RCA inputs, allowing easy connection to CD players, streamers, DACs, cassette decks, and turntables with built-in phono preamp. Switch between sources with a click for seamless audio control.
- Practical and User-Friendly: Equipped with volume control, bass and treble adjustment with bypass function, three-level gain control, and a remote. The preamplifier offers convenient audio setup and optimization, making every listening session effortless.
- Motorized Potentiometer: Featuring a high-precision motorized analog pot, the P4 delivers smooth volume adjustment, reduced noise, and minimal distortion for a purer and more refined sound experience.
- Compact and Solid: The P4 stereo preamp features a sleek, minimalist design that saves space and provides robust resistance to electromagnetic interference, ensuring reliable performance over time.
- Exceptional Performance: With a low noise floor, high signal-to-noise ratio, and extremely low distortion, the P4 pre-amplifier delivers pristine audio, ensuring accurate sound reproduction and enhancing the listening experience for audiophiles
- Fosi Audio P4 Mini Preamplifier x 1
- 12V/1.5A Power Supply x 1
- User’s Manual x 1
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Professional Reviews 86/100
Nicely Roasted
Sound Quality
87/100
Build Quality
86/100
Features Connectivity
82/100
Value for Money
87/100
The Fosi Audio P4 Mini Preamplifier brings clean, accurate sound and unusually complete control to compact RCA systems. Best of High End highlights its low-noise, low-distortion performance, while three inputs, remote operation, selectable gain and defeatable bass and treble controls make it a versatile, space-saving hub for a refined desktop or budget hi-fi setup.
What Reviewers Are Saying
Pros
Clean, accurate, refined reproduction supported by low noise and low distortion.
Flexible control hub with three RCA inputs, seamless source switching, remote control, gain settings, tone controls and bypass.
Compact, robust enclosure designed to resist electromagnetic interference.
SOUND QUALITY PERFORMANCE 87/100
The review describes a notably clean, accurate presentation, crediting the low noise floor, strong signal-to-noise ratio, and low distortion for a purer and more refined sound. It offers less direct detail on large-scale dynamic contrasts and stereo imaging, but the overall listening assessment is strongly positive.
Transparency Resolution
91/100
The reviewer calls out pristine audio reproduction and an accurate portrayal of music, with low noise and distortion identified as key strengths. The motorized analog potentiometer is also said to reduce noise and distortion, supporting a clean and refined presentation.
Tonal Balance Musicality
89/100
The P4 is described as delivering a pure, refined, and accurate sound rather than imposing an obvious character of its own. Bass and treble controls, along with a bypass function, give owners useful flexibility to tailor the presentation when desired.
Dynamics
84/100
The review links the P4's low-noise, low-distortion operation to a cleaner signal, which can help preserve musical expression. It does not directly discuss macro-dynamic impact, transient punch, or microdynamic nuance in extended listening.
Soundstage Imaging
84/100
The review's comments on accurate, pristine reproduction suggest a well-controlled signal path. However, it provides no direct listening observations about stage width, depth, image placement, or layering.
Assessments of Build Quality, Usability, and Overall Propositions.
Build Quality
86/100
The P4 is described as compact yet robust, with construction intended to resist electromagnetic interference and support reliable operation. The reviewer also characterizes its minimalist enclosure as durable, though there is no long-term ownership evidence.
Features Connectivity
82/100
Three RCA inputs provide practical source flexibility, and click-based switching is described as seamless. The P4 also includes remote volume operation, bass and treble controls, a bypass function, and three selectable gain settings, though it lacks balanced connections and more extensive system-integration facilities.
Value for Money
87/100
At roughly $99, the P4 is positioned as an affordable compact preamp with useful tone, gain, remote-control, and source-switching provisions. The reviewer calls its robust construction a worthwhile investment, although direct comparisons with competing preamps are not provided.
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Authorized dealers for Fosi Audio Fosi Audio P4 Mini Preamplifier
- Acoustic Technologies — online and in-store — Montréal, Québec, Canada (website)
- Altitudo Audio — online and in-store — Winnipeg, Manitoba, Canada (website)
- Apos Audio — online and in-store — Oakland, California, United States (website)
- Audeos — online and in-store — Żywiec, Województwo śląskie (website)
- Audio 46 — online and in-store — New York, New York, United States (website)
- Audio Domain — online and in-store — Stadtbezirke I, Nordrhein-Westfalen, Germany (website)
- Audio Magic - EU — online and in-store — Wola, Województwo mazowieckie, Poland (website)
- AUDIOPHONICS — in-store — Bordeaux, Nouvelle-Aquitaine, France (website)
- AV Cables — online and in-store — Hornsyld, Denmark (website)
- B&H Photo — online and in-store — New York, New York, United States (website)
and 13 more verified dealers