Fosi Audio P4 Preamplifier

The Fosi Audio P4 is a compact stereo preamplifier designed as a central control hub for modern HiFi systems. Developed based on user feedback, it offers flexible input options and precise sound control in a minimalist and space-saving design.

With three RCA inputs, the P4 allows easy connection of multiple audio sources such as CD players, DACs, streamers, and turntables with built-in phono stages. Switching between sources is seamless, making it convenient for everyday use.

The preamp features bass, treble, and gain controls, along with a bypass function for a pure signal path when tone adjustments are not needed. Its motorized potentiometer ensures smooth and accurate volume control with minimal noise and distortion.

Built for performance, the P4 delivers low distortion, high signal-to-noise ratio, and excellent dynamic range. Its solid construction and resistance to interference ensure reliable operation in both desktop and HiFi environments.

Features
Triple RCA Inputs
Bass Treble And Gain Control
Motorized Volume Potentiometer
Bypass Mode For Pure Signal Path
Op-Amp Rolling Support
Remote Control Operation
Low Noise And Low Distortion Performance
Compact Minimalist Design

Compatibility
CD Players And DACs
Streamers And Audio Sources With RCA Output
Turntables With Built-In Phono Preamp
Power Amplifiers And Active Speakers

Specifications
Channels: 2.0
Inputs: RCA x3
Outputs: RCA Pre-Out
Signal-To-Noise Ratio: ≥110dB
Dynamic Range: ≥110dB
THD+N: ≤0.003%
Crosstalk: ≥105dB
Noise Floor: ≤9μV
Tone Control: ±12dB
Frequency Response: 20Hz-20kHz (±0.1dB)
Power Supply: DC 12V/1.5A

In The Box
Fosi Audio P4 Mini Preamplifier
12V/1.5A Power Supply
User’s Manual