Fosi Audio P4 Preamplifier

The Compact Control Hub for 

Your Home Audio System

Buy on Fosiaudio

Buy on Aliexpress

Buy on Amazon

Buy on eBay
Buy on Fosiaudio
Buy on Aliexpress
Buy on Amazon
Buy on eBay
Fosi Audio P4 Preamplifier

Fosi Audio P4 Preamplifier

The Compact Control Hub for Your Home Audio System 

Buy on Fosiaudio

Buy on Aliexpress

Buy on Amazon

Buy on eBay

Fosi Audio P4 Sales Report

Since the launch of the Fosi Audio P4, the product has received an overwhelming response. The limited initial batch of 1,500 units available on our official website sold out rapidly.

We extend our sincere gratitude to every customer for your trust and support. It is your enthusiastic participation that has made this remarkable achievement possible.

To meet the strong demand, we have arranged an additional production run of 3,000 units, scheduled for completion in March.

For those who missed the initial release, we are now offering a pre-order program.

Estimated shipping: Orders are scheduled to commence in March. We will keep you updated via our official page for order.

* Additionally, pre-order program have also been launched on other platforms such as AliExpress and eBay.

Fosi Audio P4 Sales Report

Since the launch of the Fosi Audio P4, the product has received an overwhelming response. The limited initial batch of 1,500 units available on our official website sold out rapidly.

We extend our sincere gratitude to every customer for your trust and support. It is your enthusiastic participation that has made this remarkable achievement possible.

To meet the strong demand, we have arranged an additional production run of 3,000 units, scheduled for completion in March.

For those who missed the initial release, we are now offering a pre-order program.

Estimated shipping: Orders are scheduled to commence in March. We will keep you updated via our official page for order.

* Additionally, pre-order program have also been launched on other platforms such as AliExpress and eBay. 

Another Masterpiece Driven by Voice of Customers 

The P4 is a mini preamp supporting three inputs, developed based on extensive feedback 

from users worldwide after the launch of the V3 stereo amp.
V3 stereo amp

We will continue to listen carefully, record your feedback promptly, and make efforts to turn your ideas and suggestions into reality. 

I would pay $150 for a pre that had 2-3 RCA inputs a real sub out and with volume, bass and treble. -Northa40 from ASR 

Now for this pre-amp, l‘d be more impressed if it didn’t have tubes, and maybe more inputs. -Jim  from ASR 

SS preamp that would allow for multiple inputs, with a remote. -Joe Smith from ASR 

If you want to make a real preamplifier, it should have at least 2-3 inputs. -Zek from ASR 

It would be perfect if it had bypass and a remote... and actually worked properly. -TonyJZX from ASR 

Crafted with Care, Small Yet Powerful
DAC Converter
Triple RCA Inputs

Triple RCA Inputs
Remote Control

Remote Control
Best Preamplifier

All-Aluminum Alloy
Tone Control

Tone Control 
Motorized Potentiometer

Motorized Potentiometer
Replaceable Op-Amp

Replaceable Op-Amp
Home Audio P4

The Mini Control Hub for Home Audio System

Easily connect up to three audio sources, with one-touch input switching for ultimate audio freedom
Best Preamp

The Mini Control Hub for Home Audio System

Easily connect up to three audio sources, with one-touch input switching for ultimate audio freedom
hi-fi

High-Precision Motorized Analog Potentiometer Integrated

Not only provides a smoother volume adjustment experience, but also further reduces noise and distortion, delivering a purer soundscape for you
Best Preamp

Practical Features with Ease of Use 

Tone Control Bypass 

Bypass the tone control to enjoy the purest high-fidelity sound. 

Three-level Gain Adjustment 

Match different output levels from audio sources for improved sound quality. 

Pre-out Port 

Expandable connection for a powered subwoofer.

Bass and Treble Control

Achieve personalized tuning with central detents for better sound customization.
Multi-Function IR Remote Control

Multi-Function IR Remote Control

Easily adjust the volume, switch sources, and control the tone without leaving your seat, enjoying a convenient audio experience

All-Aluminum Alloy CNC Construction

Metallic texture, compact and refined, with enhanced resistance to electromagnetic interference

Series Design, Perfectly Paired with the V3 Amp

With a harmonious and unified appearance, it elevates both the visual and audio experience of your sound system
V3 Amp

Visible Exceptional Sound Quality

Metallic texture, compact and refined, with enhanced resistance to electromagnetic interference

Specifications

Channel

2.0

Input

RCA*3

Output

RCA, Pre-out

SNR

≥ 110dB

Dynamic Range

≥ 110dB

THD+N

≤ 0.003%

Crosstalk

≥ 103dB

Noise Floor

≤ 9μV

Tone Adjustment Gain

±12dB

Frequency Response

20Hz-20kHz(±0.1dB)

Power Supply

DC 12V/1.5A