Fosi Audio-P4 Mini Preamp - Headphone Amplifier with volume, bass, and treble knobs in a compact black metal chassis for multi-source audio setups.
Fosi Audio-P4 Mini Preamp - Headphone Amplifier shown on a wooden desk, highlighting triple inputs, tone control, and remote compatibility for home audio.
Rear and front panel view of Fosi Audio-P4 Mini Preamp - Headphone Amplifier with RCA inputs, tone controls, and remote for versatile audio connectivity.
Exploded view of Fosi Audio-P4 Mini Preamp - Headphone Amplifier showing motorized analog potentiometer for precise remote-controlled volume adjustment.
Fosi Audio-P4 Mini Preamp - Headphone Amplifier setup in a home entertainment system with speakers and monitor, showcasing compact all-metal design.
Audio performance charts of Fosi Audio-P4 Mini Preamp - Headphone Amplifier displaying THD+N, frequency response, noise floor, and SNR for audiophile quality.
Connection diagram for Fosi Audio-P4 Mini Preamp - Headphone Amplifier showing RCA input/output options for DACs, turntables, and speaker systems.
Fosi Audio-P4 Mini Preamp - Headphone Amplifier featured in a high-end home audio system with three input sources and multiple speaker configurations.
Fosi Audio-P4 Mini Preamp - Headphone Amplifier CNC-machined aluminum alloy body shown in exploded view for durability and EMI resistance.
Packing list of Fosi Audio-P4 Mini Preamp - Headphone Amplifier including remote control, power adapter, and user manual for complete setup.

Fosi Audio

Fosi Audio- P4 Mini Preamp Headphone Amplifier

Sale price₹ 9,990Regular price ₹ 15,999

    Triple RCA Inputs for Seamless Multi-Source Connectivity

    Ultra-Low THD+N (≤0.003%) with High SNR (≥110dB)

    Adjustable Bass & Treble with ±12dB Tone Control and Bypass

    Remote-Controlled Motorized Volume with 3 Gain Settings

    Ideal Partner to V3 Amplifier

    Swappable Op-Amp Design for Custom Sound Tuning

    Premium CNC Aluminum Build with Included 12V Power Supply

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Description

This premium stereo preamplifier offers versatile multi-source connectivity with three RCA inputs, allowing seamless switching between CD players, DACs, streamers, and more without cable swapping. Designed for audiophile-grade performance, it features ultra-low distortion (THD+N ≤ 0.003%), high SNR (≥110dB), and exceptional crosstalk rejection for clean, detailed sound. Custom audio tuning is made easy with ±12dB bass/treble tone controls, a bypass switch for pure signal path, and three gain settings to match any amplifier. A remote-controlled motorized volume knob adds convenience, while dual RCA outputs enable flexible system integration with powered speakers, subs, or external amps. Housed in a rugged CNC-machined aluminum body with an included 12V power supply, it combines durability with sleek aesthetics. Compact and stylish, it fits effortlessly into modern home setups, offering the perfect balance of functionality, sound quality, and user-friendly design.

MULTI-SOURCE CONNECTIVITY WITH 3 RCA INPUTS

Equipped with three stereo RCA input ports, this preamplifier allows easy switching between multiple audio sources such as CD players, DACs, network streamers, turntables (with external phono stage), and other line-level devices. This flexible connectivity ensures that your entire audio setup can be accessed without constantly unplugging cables, making it ideal for users with multi-source home systems.

ULTRA-CLEAN SOUND WITH LOW DISTORTION AND HIGH SNR

Experience outstanding audio clarity with ultra-low Total Harmonic Distortion (THD+N ≤ 0.003%), ensuring your music remains clean and faithful to the original recording. The high signal-to-noise ratio (≥110dB) combined with an ultra-low noise floor (≤9μV) and high crosstalk rejection (≥105dB) delivers crystal-clear sound reproduction, even in complex or high-resolution listening environments.

TONE CONTROL & GAIN SWITCHING FOR CUSTOM AUDIO

Fine-tune your sound with dedicated bass and treble tone controls, offering a wide ±12dB adjustment range for both frequencies. Whether you prefer warm lows or sparkling highs, this preamp adapts to your taste. A tone control bypass switch is included to preserve a pure signal path when EQ isn’t needed. Additionally, three selectable gain levels let you match output to various amplifiers or speakers, ensuring optimal volume and clarity without distortion. The user-swappable op-amp design further enhances customization, allowing audiophiles to personalize the sound signature with their preferred op-amp chips.

REMOTE-CONTROLLED MOTORIZED VOLUME FOR EFFORTLESS USE

Enjoy hands-free operation with the included IR remote control, which lets you adjust volume, cycle through input sources, tweak tone settings, and manage gain—all from the comfort of your listening position. The motorized analog potentiometer ensures smooth, noise-free volume control whether adjusted manually or remotely, combining tactile precision with modern convenience.

DUAL OUTPUT OPTIONS FOR FLEXIBLE SYSTEM INTEGRATION

The unit features both RCA line-out and pre-out connections, allowing it to be paired with a variety of audio gear. Easily connect to powered speakers, subwoofers, or external power amplifiers to build a more dynamic and complete audio system. This versatility makes it ideal for both casual listeners and audiophiles seeking a scalable setup. Perfectly paired with the V3 Amp, it delivers an exceptional synergy for balanced performance and full-range sound clarity.

RUGGED ALUMINUM BODY WITH INCLUDED POWER SUPPLY

Built to last, the preamp is housed in a CNC-machined aluminum enclosure that not only enhances durability but also provides shielding against electromagnetic interference. The included DC 12V/1.5A power supply ensures a plug-and-play setup without the need for aftermarket adapters or modifications.

SLEEK, SPACE-SAVING DESIGN FOR MODERN SETUPS

With its sleek black brushed-metal finish, this preamp seamlessly complements modern home decor and fits easily into tight spaces such as desktop setups, entertainment units, or studio racks. Despite its small footprint, the build quality and design give it a premium aesthetic and tactile appeal.

Specifications

Brand Name
Fosi Audio
Model
P4 Mini
Product Name
Preamp Headphone Amplifier
Channel
2.0
Input Mode
3 RCA
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
Power Supply
DC 12V/1.5A Included
Recommended Pairing
Perfectly Paired with V3 Amp

Box Content

    What will you get
  • 1x Fosi Audio P4 Mini Preamplifier
  • 1x User Manual
  • 1x 12V/1.5A Power Supply

Warranty

1 YEAR WARRANTY

Don't worry, Fosi Audio P4 Mini Preamp Headphone Amplifier comes with a 1 Year warranty against manufacturing defects. We guarantee that every product on Concept Kart is genuine and backed by the Manufacturer's warranty.

Read more about Concept Kart's warranty policy.

Shipping Policy

FREE SHIPPING ON ALL PREPAID ORDERS

We usually ship orders on same day if ordered before 2 pm or within 24 hours if ordered later (except on holidays/sunday, where processing times may be higher) from one of our domestic warehouses based out of Delhi. It normally takes around 1 to 5 business days for delivery. We use premium service partners such as Blue dart, DTDC and Delivery for faster and reliable service. A tracking number will be provided upon shipment.

In very rare cases when order is not received after 10 business days of shipment (extended by number of days when the govt. Restricts movement of goods due to factors such as coronavirus pandemic), please contact us and we will provide you a support.