FOSI AUDIO SK01 Headphone Amplifier

The Fosi Audio SK01 is a high-performance headphone amplifier with good measurements and low distortion. Its output power is up to 2400mW @ 32Ω. It also features numerous equalization potentiometers and two gain levels, enabling it to adapt to all types of headphones and in-ear monitors on the market. Compact, it also features two headphone outputs on 3.5mm jack and 6.35mm jack respectively, as well as a line input and output, both on 3.5mm jack. This gives it a certain versatility in its possible uses: headphone amplifier, preamplifier, or even equalizer for instruments such as a guitar, for example. Fosi Audio's SK01 headphone amplifier is battery-powered and recharges via USB-C connector.

Audio Science Review's test of the Fosi Audio SK01

"If this were an ordinary headphone amplifier, objective performance would indicate an average rating. But the addition of tone and volume controls, together with such low levels of noise and distortion, make it subjectively superior to other headphone amplifiers."