---
product_id: 575002662
title: "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: "AR$401302"
currency: ARS
in_stock: true
reviews_count: 6
category: "Fosi Audio"
url: https://www.desertcart.com.ar/products/575002662-sk01-headphone-amplifier-equalizer-preamp-with-bass-midrange-treble-tone
store_origin: AR
region: Argentina
---

# Dual 3.5/6.35mm jacks for instruments 6-hour rechargeable battery 3-band analog tone control 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:** AR$401302
**Availability:** ✅ In Stock

## Summary

> 🎧 Elevate your sound game—anywhere, anytime, with precision and power.

## Quick Answers

- **What is this?** 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?** AR$401302 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.ar](https://www.desertcart.com.ar/products/575002662-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 pure, uncolored audio for true fidelity.
- • **Portable Powerhouse:** Up to 2400mW output and 6 hours battery life keep your music alive anywhere, anytime.
- • **Premium Build & Feel:** Sleek aluminum alloy chassis combines durability with a professional aesthetic that stands out.
- • **Precision Tri-Band EQ:** Customize bass, midrange & treble with smooth analog control for your perfect sound signature.
- • **Versatile Connectivity:** Seamlessly switch between 3.5mm and 6.35mm jacks to amp headphones or electric guitars with ease.

## Overview

The Fosi Audio SK01 is a portable Class A analog headphone amplifier and preamp designed for electric guitars and headphones. Featuring a tri-band tone control (bass, midrange, treble), loudness compensation, and a tone-defeating bypass, it delivers up to 2400mW output with a built-in 2500mAh battery offering 6 hours of use. Its aluminum alloy body houses dual 3.5mm and 6.35mm jacks, supporting a wide range of impedance headphones and instruments, making it a versatile, high-quality audio companion for professionals and enthusiasts alike.

## 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 |
| Amplifier Type | Solid State |
| Best Sellers Rank | #23,276 in Electronics ( See Top 100 in Electronics ) #27 in Headphone Amps |
| Brand | Fosi Audio |
| Built-In Media | Fosi Audio SK01 |
| Color | Black |
| Compatible Devices | Musical Instruments with 6.35mm or 3.5 Jack Connectors |
| Connector Type | 3.5mm Jack, 6.35mm Jack |
| Customer Reviews | 4.5 4.5 out of 5 stars (458) |
| Enclosure Material | Aluminum Alloy |
| Item Dimensions D x W x H | 12.1D x 5.1W x 4.3H centimeters |
| Manufacturer | Fosi Audio |
| Mfr Part Number | SK01-Fosi-EU |
| Model Name | SK01 |
| Model Number | SK01 |
| Number of Bands | 3 |
| Output Channel Quantity | 2 |
| Output Wattage | 2.4 Watts |
| Power Source | Battery Powered |
| Unit Count | 1 Count |

## 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 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 M***W on 1 March 2026*

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.

## 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.com.ar/products/575002662-sk01-headphone-amplifier-equalizer-preamp-with-bass-midrange-treble-tone](https://www.desertcart.com.ar/products/575002662-sk01-headphone-amplifier-equalizer-preamp-with-bass-midrange-treble-tone)

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*Product available on Desertcart Argentina*
*Store origin: AR*
*Last updated: 2026-05-10*