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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.
- 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
Dealers selling Fosi Audio near you
Fosi Audio P4 Mini Preamplifier — compact control with transparent sound
The P4's most compelling quality is its transparent, low-noise presentation, delivering clear, accurate playback from a tiny chassis. According to Finn de Kroon of Best of High End, the P4 benefits from a motorized analog potentiometer and measured specs that keep distortion and hiss to a minimum. Sonically it favors precision and neutrality, with tone controls and three-level gain allowing tailored bass and treble while preserving dynamics and imaging for small systems. Build-wise the unit is solid and EMI-resistant, and the three RCA inputs, pre-out, bypass and remote make it a versatile hub for turntables with built-in phono preamps, streamers and CD players. For budget-conscious audiophiles seeking high value and compact refinement, the P4 offers rare performance at its price point.
Pros
- Very low noise floor and high signal-to-noise ratio deliver transparent, accurate sound for a compact preamp.
- High-precision motorized analog potentiometer provides smooth volume control while reducing noise and distortion.
- Generous connectivity and controls — three RCA inputs, RCA pre-out, tone controls, bypass, three-level gain and remote — make it a versatile system hub.
- Sturdy, EMI-resistant construction and minimalist design punch above its sub-$100 price class.
Transparency
90/100
Review highlights a low noise floor, high SNR and 'extremely low distortion' plus a motorized analog potentiometer that reduces noise and distortion. Those comments support very high transparency for a budget unit; nothing in the review suggests audible hum or hiss. Given the explicit praise for a 'purer, more refined sound' and low measured noise specs, a strong transparency score is warranted.
Sound Quality
86/100
Dynamics
86/100
High SNR and very low THD references imply good preservation of micro- and macro-dynamics; the motorized potentiometer is also said to reduce distortion which helps dynamic integrity. The review doesn't explicitly describe slam or extreme transient detail, so dynamics are scored positively but not at reference levels.
Soundstage Imaging
85/100
Although the review does not delve into detailed imaging metrics, the cited transparency, low noise and accurate reproduction imply solid channel separation and imaging for its class. No explicit praise for expansive soundstage is present, so a strong but not exceptional score is given.
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Build Quality
86/100
Reviewer praises a sleek, minimalist design, robust construction and EMI resistance; the inclusion of a motorized analog pot also suggests attention to component quality. For a sub-$100 unit these are notable strengths, supporting a high build-quality rating for its price segment.
Features Connectivity
83/100
Includes three RCA inputs, RCA pre-out, motorized volume control, bass/treble adjustments, bypass, three-level gain control and a remote — more than a bare-bones preamp but lacks balanced I/O, phono, headphone out or DAC. That combination places it above the minimal baseline but short of a fully-featured high-end preamp.
Value for Money
93/100
At the stated ~$99 price and with reviewer language calling it a 'must-have', 'excellent choice' and 'worthwhile investment', the unit is clearly presented as strong value. The combination of performance, features and construction for the price justifies a very high value score.
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