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Fosi Audio P4 Mini Preamp with 3 RCA Inputs, Home Audio Stereo Pre amp for Amplifier/Active Subwoofer/Speakers, Preamplifier with 3-Level Adjustable Gain 3/6/9 dB, Bass and Treble Control

4.3 out of 5 stars 44 ratings
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Purchase options and add-ons

  • 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 pre amp 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
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Frequently bought together

Fosi Audio P4 Mini Preamp with 3 RCA Inputs, Home Audio Stereo Pre amp for Amplifier/Active Subwoofer/Speakers, Preamplifier
This item: Fosi Audio P4 Mini Preamp with 3 RCA Inputs, Home Audio Stereo Pre amp for Amplifier/Active Subwoofer/Speakers, Preamplifier with 3-Level Adjustable Gain 3/6/9 dB, Bass and Treble Control
$139.99
Get it by Wednesday, Jul 2
In Stock
Sold by Fosi Audio and ships from 鶹 Fulfillment.
+
Fosi Audio 2RCA to 2RCA Cable 0.9Ft, Gold-Plated 2 RCA Male to 2 RCA Male Stereo Audio Cable for Home Theater Systems/Amplifi
$39.99
Get it by Wednesday, Jul 2
In Stock
Sold by Fosi Audio and ships from 鶹 Fulfillment.
+
Fosi Audio 2RCA to 2RCA Cable 3.9Ft, Gold-Plated 2 RCA Male to 2 RCA Male Stereo Audio Cable for Home Theater Systems/Amplifi
$29.99
Get it by Wednesday, Jul 2
In Stock
Sold by Fosi Audio and ships from 鶹 Fulfillment.
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Product information

Technical Details

Brand ‎Fosi Audio
Manufacturer ‎Shenzhen Foresight Technology Co., Ltd.
Place of Business ‎3rd Floor, Building 10, Aohua Industrial Zone, Gaofeng Community, Dalang Street, Longhua District, Shenzhen
Model ‎P4
Part Number ‎P4
Mounting Hardware ‎Fosi Audio P4 Preamplifier x1, User Manual x1, Remote Control x1, 12V/1.5A Power Supply x1
Number of Items ‎1
Batteries included ‎No
Batteries Required ‎No
Manufacturer ‎Shenzhen Foresight Technology Co., Ltd.
Item model number ‎P4
Product Dimensions ‎13.97 x 10.16 x 3.05 cm; 477 g
ASIN ‎B0DR2GKYW3

Additional Information

Date First Available Feb. 18 2025
Customer Reviews
4.3 out of 5 stars 44 ratings

4.3 out of 5 stars
鶹 Rank

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Fosi Audio P4 Mini Preamp with 3 RCA Inputs, Home Audio Stereo Pre amp for Amplifier/Active Subwoofer/Speakers, Preamplifier with 3-Level Adjustable Gain 3/6/9 dB, Bass and Treble Control

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Product Description

Fosi Audio P4 Audio Preamplifier Mini Preamp Desktop Audio Amplifier High-Fidelity Preamp

Compact Control Hub for Home Audio

Fosi Audio P4 Mini HiFi Preamplifier

Equipped with triple inputs, tone control, and remote control for a convenient and customizable audio experience.

The video showcases the product in use.The video guides you through product setup.The video compares multiple products.The video shows the product being unpacked.

Fosi Audio P4 Mini HiFi Preamplifier

Merchant video

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)
  • Input Voltage: DC 12V

  • First, connect P4 to your audio sources via RCA cables, then connect P4 to an amplifier via RCA cables, and lastly, use speaker cables to connect the amplifier to the passive speakers.

  • This is the bypass function for turning the tone control on and off. Sliding it up bypasses the bass and treble adjustments while sliding it down enables the bass and treble controls. The bypass switch wont function on the volume control.

  • It ensures smooth, precise volume control, and enhances usability while reducing noise and distortion. When adjusting the volume with the remote, the potentiometers motor syncs with the physical knob, providing a seamless and intuitive experience.

  • Allows for easy connection to external powered subwoofers or additional amplification. It ensures seamless integration with your audio system, enabling enhanced bass response or driving additional speakers for a more immersive listening experience.

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