---
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: "890.37 DT"
currency: TND
in_stock: true
reviews_count: 13
category: "Fosi Audio"
url: https://www.desertcart.tn/products/575548630-sk01-headphone-amplifier-equalizer-preamp-with-bass-midrange-treble-tone
store_origin: TN
region: Tunisia
---

# 2400mW high-impedance power 6-hour battery life 3-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:** 890.37 DT
**Availability:** ✅ In Stock

## Summary

> 🎧 Elevate Every Note — Power, Precision, and Portability in One Sleek Amp

## 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?** 890.37 DT with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/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 audio to its pure, original form—no compromises.
- • **Portable Powerhouse:** Compact aluminum alloy chassis with up to 6 hours of uninterrupted Class A analog amplification.
- • **Loudness Compensation:** Enjoy rich, full-bodied sound even at low volumes, perfect for late-night listening sessions.
- • **Precision Tri-Band EQ:** Effortlessly tailor bass, midrange, and treble for your perfect sound signature.
- • **Versatile Connectivity:** Seamlessly switch between 3.5mm and 6.35mm jacks to power headphones and instruments alike.

## Overview

The Fosi Audio SK01 is a portable Class A analog headphone amplifier and equalizer featuring tri-band tone control (bass, midrange, treble), a powerful 2400mW output for high-impedance headphones, and a robust 2500mAh battery delivering up to 6 hours of use. Its durable aluminum alloy body houses versatile 3.5mm and 6.35mm jacks, a one-click tone-defeating reset, and loudness compensation for enhanced audio clarity at any volume. Ideal for professionals and audiophiles seeking customizable, high-fidelity sound on the go.

## Description

Product Description Fosi Audio SK01 Headphone Amplifier/Preamp A multi-functional audio gear for desktop and portable music playing and tone tuning. aplus content video Tailor the Sound to Your Preference With treble, middle, and bass adjustments capabilities, combined with central point positioning, you can easily find the perfect balance. Additionally, you can effortlessly defeat all the tone adjustments with just a click on the PURE button. Input: 3.5mm line in Output: 3.5mm line out, 3.5mm/6.35mm headphone jack Max Power Output: RMS 2400mW@32Ω Terminating Impedance: 16-300Ω Tri-Band Adjustment for Personality Tailor the treble, middle, and bass with the knobs to find the perfect balance. Loudness Function for More Pleasure Activate it to get a more balanced listening experience at lower volume levels. Two Gain Modes to Adapt Your Headphones Achieve the best performance by selecting the right gain level to fit different impedance. Compatible with 3.5mm/6.35mm Headphones Maximum 2400mW power to drive your 32-300Ω single-ended headphones with extraordinary performance. As a Headphone Amp Drives any of your headphones easily and enrich the listening experience. As an Analog Preamp Modifies the characteristic to get your beloved sound. As an Equalizer Delivers accurate sonic detail for acoustic instruments. 6-Hour Battery Life With a built-in high-capacity battery and isolated power design to reject interference, it ensures a pure listening experience without break off. Aluminum Alloy Body The full-metal body is exquisitely crafted, both in appearance and touch, adding a touch of elegance to your desktop. Parameter Comparison SK01 SK02 PH05 P2 K5 PRO Q4 DS1

Review: Does exactly what you'd expect, and does it well - 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: A really nice bit of kit for a bargain price! - I use headphones when listening to videos on the internet and have a good quality set of headphones for that purpose. That being said, my computer motherboard's output was not adequate to drive the headphones well enough. This wee headphone amplifier gives my headphones that extra bit of power to improve the volume with dedicated controls to boost the treble, midrange and bass to suit my taste. A really nice bit of kit for a bargain price. Highly recommended for my type of application. Five stars.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| 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 |
| Product dimensions | 12.1D x 5.1W x 4.3H centimetres |

## 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)
![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 2](https://m.media-amazon.com/images/I/81UfqKW9seL.jpg)
![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 3](https://m.media-amazon.com/images/I/61s7EcpfjoL.jpg)
![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 4](https://m.media-amazon.com/images/I/81ul7+1M0SL.jpg)
![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 5](https://m.media-amazon.com/images/I/61fYge8Y3DL.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

### ⭐⭐⭐⭐⭐ Does exactly what you'd expect, and does it well
*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.

### ⭐⭐⭐⭐⭐ A really nice bit of kit for a bargain price!
*by D***K on 6 March 2026*

I use headphones when listening to videos on the internet and have a good quality set of headphones for that purpose. That being said, my computer motherboard's output was not adequate to drive the headphones well enough. This wee headphone amplifier gives my headphones that extra bit of power to improve the volume with dedicated controls to boost the treble, midrange and bass to suit my taste. A really nice bit of kit for a bargain price. Highly recommended for my type of application. Five stars.

### ⭐⭐⭐⭐⭐ I ❤️💛💚 MY FOSI SK01
*by B***E on 10 January 2025*

Fosi SK01 delivers on many fronts, with its versatility. The sound quality is very smooth too. I've used it with my bass heavy Soundcore boom plus 2 Bluetooth speaker, it literally tames the bass, and the ability to also increase/decrease midrange and treble frequencies too makes the speaker sound stupendously awesome, and a joy to listen too ! Results are also very good on my mobile phone, TV and DJ controller. Not so good on my laptop, but that's purely because the laptop manufacturer has skimped on quality audio components, having said that it still sounds great, but with less oomph. All the knobs, buttons and inputs/outputs just work like they should, and my Sennheiser headphones have come alive too. No need to have the volume up too loud either as it delivers great audio quality. Battery life is dependent on how hard you use it, but satisfying all the same. The warning indicator light above the treble knob will flash when the battery power is running low, and show red when you're charging it up. When fully charged, the red light will go out. You can continue to use it when it's charging, but I think it's best to make it charge undisturbed, to prolong the overall longevity of the battery life. The light below the volume knob will flash faster when the volume is too loud, another nice touch My lower quality music files are also enhanced by the Fosi SK01, as I take advantage of the ample frequency ranges provided to tailor and boost the sound where ever it is needed. The sleek rectangular shape is aesthetically pleasing to look at and solidly built, the bottom of the knobs are almost seamless against the main body of the amp, which eliminates dust getting inside I'm not a headphone amp connoisseur so can't compare, and no doubt there are brilliant premium models out there, costing mega bucks ! But Fosi Audio have come up with a winner, that covers many bases, delivering real quality at a price point that doesn't break the bank. One more point… I wish it had Bluetooth capability, to combine with my Bluetooth speaker, to eliminate using leads connecting them together, when I'm out in the public domain. Overall, though, a very well-thought-out product that deserves the accolades and positivity lavished upon it. Well done Fosi Audio 💯 🔥🔥🔥🔥🔥🔥😁

## 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 Tunisia*
*Store origin: TN*
*Last updated: 2026-07-08*