Fosi Audio SK01 Headphone Amplifier Equalizer Preamp with Bass Midrange Treble Tone Control and Loudness Compensation Portable Class A Analog Amp for Electric Guitar Instrument with 3.5/6.35mm Jacks

Small easy to carry and it have its own battry if you plan to take it out for a while, at home it made my time with the higher sound and bass tweaking.

I bought this to add life and depth to a portable cd player that works great but sounds a little flat, and struggles to drive higher-impedance headphones. This works perfectly, adds a lot more power/volume and the tone controls give a good range of eq. The "loudness" button is also very useful at low volume, the sound quality of my cd player is greatly improved with this little device. Couldn't be happier with it. Also does the same for phone/tablet. Build quality is excellent, feels very solid and durable. Small enough to put in your pocket, if a little heavy.

I’m using the Fosi Audio SK01 together with the Fosi Audio DS2 and my Beyerdynamic DT 770 Pro 80 Ohm, and the combination sounds fantastic. The SK01 has more than enough power to drive my 80 ohm headphones with ease. The sound is clean, dynamic, and detailed. Bass has great punch and control, guitars sound clear and energetic, and vocals are natural without being recessed. It really brings my music to life. The tone controls are a big advantage. I can slightly boost the bass when I want more energy, or adjust the treble for extra clarity depending on the recording. It’s simple but very effective. Build quality is solid, the knobs feel smooth, and it looks great on the desk. For the price, the performance is impressive. If you’re building a budget-friendly but high-quality wired headphone setup, the Fosi Audio SK01 is absolutely worth it.

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Tengo varios amplificadores de auriculares, entre ellos alguno de sobremesa, con componentes discretos y en clase A y algún otro de triodos single ended. Pero desde que tengo éste, no he vuelto a usar ninguno de los otros. La versatilidad de poder ecualizar graves, medios y agudos y aplicar loudness (que por cierto está muy bien logrado) hacen que sin importar que cascos utilice, siembre encuentro el balance tonal adecuado. Muy contento con él.

DAC FOSI SK01 Qualité et ergonomie excellente, fonctionnement OK, ne nécessite pas d'alimentation séparée (prise usb-c in pour data et alim). Entrées usb c ou optique Sorties : optique et line out audio (même prise), plus jack 3,5 mm et jack 4,4 mm Attention ne fonctionne pas avec les iPhone lightning , même avec le connecteur USB-3 Le gros bouton ne possède pas de repère : j'ai mis un point blanc avec un feutre indélébile