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The Fosi Audio P4 Mini Preamplifier is a high-performance, compact control hub designed to enhance your home audio system. It offers exceptional sound clarity, versatile connectivity, and user-friendly features in a sleek, all-aluminum chassis.
Mini Control Hub with Triple Inputs:
Easily connect up to three different audio sources—such as a CD player, DAC, streamer, or turntable (requires an external phono preamp)—using the three dedicated RCA inputs. Switch seamlessly between sources with a single click on the front panel or the included remote.
Precision and Clarity:
Engineered for audiophiles, the P4 delivers pristine audio quality with extremely low distortion (THD+N $\le 0.003\%$) and an excellent signal-to-noise ratio ($\ge 110\text{dB}$). Experience your music with a low noise floor and faithful sound reproduction.
Motorized Volume Control & Remote:
The high-precision motorized analog potentiometer allows for smooth, accurate volume adjustments from across the room via the included IR remote control. This minimizes noise and distortion compared to digital controls, ensuring a purer soundscape.
Customizable Tone Control:
Fine-tune your listening experience with $\pm 12\text{dB}$ bass and treble controls. A convenient bypass switch is included on the rear panel, allowing you to completely defeat the tone circuit for the purest, high-fidelity signal path when preferred.
Flexible System Integration:
The P4 features both a standard RCA output and a dedicated Pre-Out port. This volume-controlled pre-out is ideal for connecting an active subwoofer or a pair of powered speakers, providing flexible options for system upgrades and expansion.
Adjustable Gain:
A three-level gain adjustment switch (+3dB, +6dB, +9dB) ensures perfect level matching for various audio sources, optimizing the signal before it reaches your power amplifier.
The P4 Mini is the perfect companion for a power amplifier like the Fosi Audio V3, providing essential source selection, volume control, and audio customization in a compact, solid-state unit.
Equipped with triple inputs, tone control, and remote
control for a convenient and customizable audio experience.
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.
1.Input: RCA x3; Output: RCA, Pre-Out
2.SNR≥ 110dB; THD+N≤ 0.003%
3.Frequency Response: 20Hz-20kHz(±0.1dB)
Offer smooth volume adjustment while reducing noise and distortion for
a purer soundscape.
Expandable connection for powered subwoofers/powered speakers.
Match different output levels from audio sources for improved sound
quality.
Bypass the tone control circuit to enjoy the purest high-fidelity sound.
Easily adjust the volume, switch sources, and control the tone without
leaving your seat.
Compare products to find the best one for your needs.
Channel:2.0
Input Mode:RCA*3
Output Mode:RCA, Pre-out
SNR:≥ 110dB
Dynamic Range:≥ 110dB
THD+N:≤ 0.003%
Crosstalk:≥ 105dB
Noise Floor:≤ 9μV
Tone Adjustment Gain:±12dB
Frequency Response:20Hz-20kHz(±0.1dB)
Power Supply:DC 12V/1.5A
The Fosi Audio P4 serves as a high-fidelity bridge between your audio source and your power amplifier or active speakers. Its primary role is to refine and warm up the audio signal. By utilizing vacuum tubes, the P4 softens the harsh "digital edge" often found in modern recordings, adding a layer of organic texture, depth, and musicality to your overall listening experience.
Yes, but please note that the P4 is a line-level preamplifier. If your turntable has a built-in phono preamp, you can connect it directly to the P4. If your turntable does not have one, you will need to place a phono stage (like the Fosi Audio Box X2) between the turntable and the P4. This setup allows you to enjoy the classic "Tube Sound" combined with the nostalgic warmth of vinyl records.
Absolutely. One of the best features for audiophiles is that the P4 supports tube rolling. The stock vacuum tubes can be easily swapped with compatible models (such as 5654W, 6K4, or EF95). This allows you to "tune" the sound signature to your personal preference, exploring different tonal balances and soundstages without needing to buy an entirely new preamplifier.
Yes, the P4 is designed for personalized sound shaping. It features high-precision independent knobs for Bass and Treble adjustment, alongside a main Volume control. These analog controls allow you to compensate for the acoustic limitations of your room or the specific sound signatures of your speakers, ensuring you can achieve a balanced and pleasing sound at any volume level.
No, the P4 is a preamplifier, not a power amplifier. It does not have the high-current output required to drive passive speakers directly. To complete your system, you should connect the P4’s output to a power amplifier (such as the Fosi Audio V3 or ZA3) or a pair of active (powered) speakers. This signal chain ensures that the audio is properly refined by the tubes before being amplified for your speakers.
