---
product_id: 575002662
title: "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"
brand: "fosi audio"
price: "€ 177.46"
currency: EUR
in_stock: true
reviews_count: 6
category: "Fosi Audio"
url: https://www.desertcart.sk/products/575002662-fosi-audio-sk01-headphone-amplifier-equalizer-preamp-with-bass-midrange
store_origin: SK
region: Slovakia
---

# Supports 32-300Ω headphones 6-hour battery life Tri-band tone control 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

**Brand:** fosi audio
**Price:** € 177.46
**Availability:** ✅ In Stock

## Summary

> 🎸 Elevate your sound game—wherever, whenever.

## Quick Answers

- **What is this?** 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 by fosi audio
- **How much does it cost?** € 177.46 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sk](https://www.desertcart.sk/products/575002662-fosi-audio-sk01-headphone-amplifier-equalizer-preamp-with-bass-midrange)

## Best For

- fosi audio enthusiasts

## Why This Product

- Trusted fosi audio brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Instant Sound Reset:** One-click tone-defeating button restores pure, uncolored audio in a snap.
- • **Portable Powerhouse:** Compact Class A analog amp with up to 2400mW output and 6-hour battery life keeps your music alive anywhere.
- • **Loudness Compensation:** Enhance low-volume listening with dynamic loudness control for richer, fuller sound.
- • **Precision Tri-Band EQ:** Fine-tune bass, midrange, and treble for your perfect soundscape.
- • **Versatile Connectivity:** Dual 3.5mm & 6.35mm jacks support a wide range of headphones and instruments seamlessly.

## Overview

The Fosi Audio SK01 is a portable Class A analog headphone amplifier and preamp designed for electric guitars and high-impedance headphones (32-300Ω). Featuring tri-band tone control, loudness compensation, and a one-click tone-defeating button, it delivers customizable, high-quality audio with up to 2400mW power output. Its durable aluminum alloy body houses a 2500mAh battery offering up to 6 hours of wireless use, with versatile 3.5mm and 6.35mm jacks for broad compatibility.

## Description

Buy 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 online on desertcart.ae at best prices. ✓ Fast and free shipping ✓ free returns ✓ cash on delivery available on eligible purchase.

Review: The usb for power only not pc connect, you need to get 3.5mm jack - 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.
Review: 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.

## Features

- Combo Design: Whether as a powerful headphone amp, a customizable analog preamp, or an acoustic equalizer for the instrument, it effortlessly elevates your listening experience, delivering exceptional sound quality and personalized sound signatures.
- Tri-Band Control: By enabling adjustments for treble, midrange, and bass, in conjunction with central detents for tone-defeating, achieving the most suitable equilibrium becomes effortless. Up to 2400mW power is available in high impedance mode.
- Diverse Capabilities: Instantly restore original sound with the one-click tone- defeating button; Immerse yourself in music during the quiet hours using the loudness function; Tailor the gain level to accommodate headphones with various impedances through the gain level switch.
- Superb Finishing: The aluminum alloy body showcases meticulous attention to details. Built-in 2500mAh battery, up to 6 hours of battery life. It offers versatile connectivity through the 3.5mm & 6.35mm headphone jacks (32-300 ohms), serving as both a portable and desktop headphone amplifier.
- What You'll Get: Fosi Audio SK01 Headphone Amp x1, User Manual x1, 2-in-1 USB Type-A/C to Type-C Cable x1, a 24-month worry-free warranty and responsive customer service.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0CF1WL1V2 |
| Best Sellers Rank | #25,331 in Electronics ( See Top 100 in Electronics ) #33 in Headphone Amps |
| Item model number | SK01 |
| Manufacturer | Fosi Audio |
| Product Dimensions | 12.09 x 5.08 x 4.29 cm; 422 g |

## Product Details

- **Brand:** Fosi Audio
- **Colour:** Black
- **Compatible devices:** Musical Instruments with 6.35mm or 3.5 Jack Connectors
- **Material:** Aluminum Alloy
- **Output wattage:** 2.4 Watts

## Images

![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 - Image 1](https://m.media-amazon.com/images/I/61wN4KgfuPL.jpg)

## Questions & Answers

**Q: Can it be used while charging?**
A: You can use the SK01 while it is plugged in and charging, and connect the source via AUX IN. Or use a 5V 1.5A/2A adapter to charge it fully and unplug it when in use

**Q: If both its line out and headphone jack are connected to the headphones and amplifier, which output takes priority?**
A: The design allows both the line output and headphone output to play the same audio simultaneously. To exclusively use the headphones, it's necessary to disconnect the line out

**Q: The tone-control knobs are not working?**
A: Please check if the TONE button is set to PURE mode. PURE is the mode where the signal bypasses the tone circuit. Switching to TONE mode should enable the tone adjustment.

## Customer Reviews

### ⭐⭐⭐⭐⭐ The usb for power only not pc connect, you need to get 3.5mm jack
*by M***I on 31 May 2025*

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.

### ⭐⭐⭐⭐⭐ Review
*by A***E on 26 December 2025*

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.

### ⭐⭐⭐⭐⭐ Review
*by R***S on 16 February 2025*

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.

## Frequently Bought Together

- 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 3.5mm 6.35mm Jacks
- Syncwire 3.5mm Nylon Braided Aux Cable (3.3ft/1m,Hi-Fi Sound), Audio Auxiliary Input Adapter Male to Male Cord for Headphones, Car, Home Stereos, Speaker, iPhone, iPad, iPod, Echo & More – Black
- Nanxudyj AUX Cord 6ft/1.8M,3.5mm Stereo Audio Cable 90 Degree 3.5mm Male to Male Stereo Aux Cable Right Angle TRS Cable Compatible for car, Headphone,Tablets, Speakers

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*Product available on Desertcart Slovakia*
*Store origin: SK*
*Last updated: 2026-02-22*