Battery-Powered Fosi Headphone Amplifier and Preamplifier!
The Fosi Audio SK01 is a headphone amplifier that gives you treble, mid and bass controls plus High/Low Gain and Loudness buttons. The built-in 2500 mAh battery delivers around 6 hours of runtime.
A 3.5 mm jack serves as the audio input and also as the line out. The SK01 is equipped with 2 headphone outputs — both 3.5 mm jack and 6.3 mm jack.
The device works great as a powerful headphone amplifier, as an analog preamplifier, or as an equalizer where you can fine-tune your personal sound.
Headphones
The Pronomic KH-900 is a professional stereo headphone that pairs excellent sonic performance with top-tier wearing comfort at a pocket-friendly price. The soft, wide faux-leather headband automatically adjusts to head size for a comfortable fit. The KH-900 offers a wide frequency range from 15 to 25,000 Hz, delivering balanced, nuanced sound with brilliant, clear highs and precise, full bass. With a low impedance of just 32 Ohm, the KH-900 delivers punchy sound and plenty of headroom even from very low-power headphone outputs like MP3 players or smartphones. The 3.5 mm stereo jack ensures excellent transmission. A 6.3 mm stereo jack adapter is also included.
Fosi Audio - Hear The Unheard!
The hotline is currently not manned. You can reach us again on Thursday, 29.10.2026 at 09:30.
Features
HiFi Headphone Amplifier
- Type: SK01
- Battery Capacity: 2500 mAh (approx. 6 hours runtime)
- Input: 3.5 mm jack
- Outputs: 2 x Headphones (3.5 & 6.5 mm jack), Line Out (3.5 mm jack)
- Maximum RMS Power: 2400 mW / 32 Ohm (High Gain), 300 mW / 32 Ohm (Low Gain)
- Frequency Range: 20 - 20,000 Hz (±0.5 dB)
- Total Harmonic Distortion: 0.001% @ 1 kHz and 770 mV
- Signal-to-Noise Ratio: =108 dB
- Impedance: 16 - 300 Ohm
- Power Supply: 5 V, USB Type-C
- Housing: Aluminum
- Dimensions: 121 x 51 x 43 mm
- Weight: 290 g
- Color: Black
Headphones
- Professional headphones for studio, digital piano or e-drum
- Drivers: ø 50 mm for high sound pressure
- Frequency Response: 15 to 25,000 Hz
- Sensitivity: 94 ± 3 dB
- Nominal Impedance: 32 Ohm
- Max. Power: 1200 mW
- Very large, softly padded, over-ear earcups
- Extremely comfortable to wear thanks to low clamping force
- Automatic size adjustment to the head
- Padding Material: Faux leather
- Soft, wide faux-leather headband
- Cable: 3 m with single-sided lead
- Plug: 3.5 mm stereo jack
- Adapter: 6.3 mm stereo jack
- Net Weight (without cable): 215 g
- Gross Weight: 244 g
Scope of delivery
- 1 x Fosi Audio SK01 HiFi Headphone Amplifier
- 1 x Headphones
Included in set
Specification
- Product number 00114641
- Colour Black
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Financing with ConsorsFinanz
You can finance your order in convenient monthly installments from a value of €100.00.
- 6 to 72 months term
- 0% financing with 6- or 12-month terms
- Financing from 9,99 € / month
