Elevate your listening setup with the Fosi Audio SK01. Combining a high-power headphone amplifier, an analog preamplifier, and a tri-band hardware equalizer with loudness compensation, the SK01 delivers up to 2400mW output power alongside precise tactile tone adjustment for headphones and active speakers.

Key Features

* High Output Power Amplification
Delivers up to 2400mW at 32 Ohms in high gain mode, providing massive clean headroom to easily drive demanding full-sized headphones and sensitive in-ear monitors with impedances ranging from 16 Ohms to 300 Ohms.

* Tri-Band Analog Hardware Equalizer
Fine-tune your sound signature using dedicated physical adjustment knobs for bass, midrange, and treble, featuring center-detent notches for quick bypass balancing.

* Switchable Loudness Compensation Function
Includes a dedicated loudness toggle switch that boosts low and high frequencies at lower listening volumes, maintaining full dynamic range and natural tonal warmth during quiet sessions.

* Dual Headphone Jacks and Line Preamplifier Output
Features both 3.5mm single-ended and 6.35mm headphone jacks on the front panel, along with a 3.5mm rear line output for integration into active desktop speaker setups.

* Rechargeable Internal Battery with Isolated Power Design
Equipped with a built-in rechargeable battery providing up to 6 hours of continuous playback, using an isolated internal power architecture to eliminate USB power ground loop noise.

* Precision CNC Aluminum Alloy Chassis
Housed in a compact, CNC-milled aluminum alloy body measuring 121mm by 51mm by 43mm, providing electromagnetic interference shielding and an elegant desktop footprint.

What is in the Box

* 1 x Fosi Audio SK01 Headphone Amplifier Preamp
* 1 x 2-in-1 USB-A/USB-C to USB-C Cable
* 1 x User Manual

Technical Specifications

* Input Interface: 3.5mm Analog Line In
* Output Interfaces: 3.5mm Headphone Jack, 6.35mm Headphone Jack, 3.5mm Line Out (Pre-Out)
* Maximum Output Power: High Gain: 2400mW @ 32 Ohms, Low Gain: 300mW @ 32 Ohms
* Frequency Response: 20Hz - 20kHz (±0.5 dB)
* Total Harmonic Distortion + Noise: 0.001 percent @ 1kHz
* Signal-to-Noise Ratio: Greater than or equal to 108 dB
* Headphone Impedance Matching: 16 Ohms to 300 Ohms
* Battery Life: Up to 6 Hours
* Power Input: USB Type-C (5V)
* Dimensions: 121mm x 51mm x 43mm
* Weight: 290g