---
product_id: 575548630
title: "SK01 Headphone Amplifier Equalizer Preamp with Bass Midrange Treble Tone Control and Loudness Compensation Portable Class A Analog Amp with 3.5mm 6.35mm Jacks"
brand: "fosi audio"
price: "1593 kr"
currency: DKK
in_stock: true
url: https://www.desertcart.dk/products/575548630-sk01-headphone-amplifier-equalizer-preamp-with-bass-midrange-treble-tone
store_origin: DK
region: Denmark
---

# Dual 3.5mm & 6.35mm jacks 6-hour battery life Tri-band tone control SK01 Headphone Amplifier Equalizer Preamp with Bass Midrange Treble Tone Control and Loudness Compensation Portable Class A Analog Amp with 3.5mm 6.35mm Jacks

**Brand:** fosi audio
**Price:** 1593 kr
**Availability:** ✅ In Stock

## Summary

> 🎧 Elevate your audio game—because your ears deserve the VIP treatment.

## Quick Answers

- **What is this?** SK01 Headphone Amplifier Equalizer Preamp with Bass Midrange Treble Tone Control and Loudness Compensation Portable Class A Analog Amp with 3.5mm 6.35mm Jacks by fosi audio
- **How much does it cost?** 1593 kr with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.dk](https://www.desertcart.dk/products/575548630-sk01-headphone-amplifier-equalizer-preamp-with-bass-midrange-treble-tone)

## 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 your original audio signature in a snap.
- • **Precision Tri-Band EQ:** Effortlessly balance bass, midrange, and treble for your perfect soundscape.
- • **Versatile Connectivity:** Seamlessly switch between 3.5mm and 6.35mm jacks for all your audio gear.
- • **Portable & Long-Lasting:** Built-in 2500mAh battery delivers up to 6 hours of uninterrupted sonic bliss.
- • **Powerful Class A Amplification:** Up to 2400mW output drives high-impedance headphones with crystal clarity.

## Overview

The Fosi Audio SK01 is a portable Class A analog headphone amplifier and equalizer featuring tri-band tone control, loudness compensation, and a powerful 2400mW output. With dual 3.5mm and 6.35mm jacks, a 2500mAh battery offering up to 6 hours of playtime, and a sleek aluminum alloy body, it’s designed for audiophiles seeking customizable, high-fidelity sound on the go or at their desk.

## Description

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

## 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 ideal 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 |
| Amplifier Type | Solid State |
| Best Sellers Rank | #19,374 in Electronics ( See Top 100 in Electronics ) #88 in Audio Component Amplifiers |
| Brand | Fosi Audio |
| Built-In Media | Fosi Audio SK01 |
| Color | Black |
| Compatible Devices | Guitar |
| Connector Type | 3.5mm Jack, 6.35mm Jack |
| Customer Reviews | 4.4 out of 5 stars 427 Reviews |
| Enclosure Material | Aluminum |
| Item Dimensions D x W x H | 4.76"D x 2"W x 1.69"H |
| Manufacturer | Fosi Audio |
| Material | Aluminum |
| Model Name | SK01 |
| Number of Bands | 3 |
| Output Channel Quantity | 2 |
| Output Wattage | 2.4 Watts |
| Power Source | Battery Powered |
| Product Dimensions | 4.76"D x 2"W x 1.69"H |
| Unit Count | 1.0 Count |
| Warranty Description | 24-month manufacturer |

## 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

![SK01 Headphone Amplifier Equalizer Preamp with Bass Midrange Treble Tone Control and Loudness Compensation Portable Class A Analog Amp with 3.5mm 6.35mm Jacks - Image 1](https://m.media-amazon.com/images/I/61RW7lo9nGL.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.

## 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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**Shop now:** [https://www.desertcart.dk/products/575548630-sk01-headphone-amplifier-equalizer-preamp-with-bass-midrange-treble-tone](https://www.desertcart.dk/products/575548630-sk01-headphone-amplifier-equalizer-preamp-with-bass-midrange-treble-tone)

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*Product available on Desertcart Denmark*
*Store origin: DK*
*Last updated: 2026-02-22*