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

P4 Pre-Order Shipping Delay Announcement

Dear Fosi Audio Customers,

We are profoundly grateful for your enthusiastic support for our new P4 preamplifier. Since its launch, we have received an unprecedented volume of orders globally, far exceeding our expectations. We understand you are eager to enjoy the exceptional sound quality of our product at home, and we want to transparently share the reasons behind the shipping delays and our solutions.

Production Update:
Due to supply chain constraints, the high-quality motorized potentiometers used in our P4 preamplifiers are currently in limited supply. Despite our efforts to ramp up production, we anticipate that the delivery of the new batch of products will be delayed until around April 10.

Release Date: March 16.  For customers who originally ordered with a planned March delivery, we will provide the following compensation. 

LEARN MORE

P4 Pre-Order Shipping Delay Announcement

Dear Fosi Audio Customers,

We are profoundly grateful for your enthusiastic support for our new P4 preamplifier. Since its launch, we have received an unprecedented volume of orders globally, far exceeding our expectations. We understand you are eager to enjoy the exceptional sound quality of our product at home, and we want to transparently share the reasons behind the shipping delays and our solutions.

Production Update:
Due to supply chain constraints, the high-quality motorized potentiometers used in our P4 preamplifiers are currently in limited supply. Despite our efforts to ramp up production, we anticipate that the delivery of the new batch of products will be delayed until around April 10.

Compensation Plan:
We sincerely appreciate your patience and understanding. To express our gratitude, we are offering the following compensation options for affected orders. You can select on of them:
1.10USD Coupon - For future purchases.
2.Double Member Points - Accrued in your Fosi Audio account.
3.Free Accessory Choice - Select one from a knob, banana plug.

We will ship orders in the sequence customers placed them to ensure that every customer receives their product as soon as possible. Please contact us at support@fosiaudio.com to select your compensation option.

This subsidy is only applicable to customers who purchase the P4 on the official website with March delivery. Orders with delivery information noted as April delivery will not be eligible for this subsidy.

We commit to continuously update you transparently about production progress and to improve on such issues in the future. Thank you for your support and trust in Fosi Audio.

Release Date: March 16

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