--- 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: "S$198" currency: SGD in_stock: true reviews_count: 13 category: "Fosi Audio" url: https://www.desertcart.sg/products/575548630-sk01-headphone-amplifier-equalizer-preamp-with-bass-midrange-treble-tone store_origin: SG region: Singapore --- # 6-hour battery life Dual 3.5mm & 6.35mm jacks 3-band analog EQ 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:** S$198 **Availability:** βœ… In Stock ## Summary > 🎧 Elevate Every Note β€” Amplify Your Audio Aura ## 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?** S$198 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.sg](https://www.desertcart.sg/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 - β€’ **Portable Powerhouse:** Class A analog amp delivering up to 2400mW with a sleek aluminum body and 6-hour battery life. - β€’ **Versatile Connectivity:** Seamlessly switch between headphones and instruments with 3.5mm & 6.35mm jacks supporting 32-300Ξ©. - β€’ **Built to Last & Impress:** Premium aluminum alloy finish with intuitive controls and a 24-month warranty for peace of mind. - β€’ **Smart Loudness & Tone-Defeat:** One-click loudness compensation and tone-defeat button restore original sound or boost quiet moments. - β€’ **Precision Tri-Band Tone Control:** Effortlessly tailor bass, midrange, and treble for your perfect sound signature. ## Overview The Fosi Audio SK01 is a portable Class A analog headphone amplifier and equalizer featuring tri-band tone control, loudness compensation, and dual 3.5mm/6.35mm jacks. With up to 2400mW output power, a robust aluminum alloy build, and a 6-hour rechargeable battery, it delivers customizable, high-fidelity sound for headphones and instruments alike. Perfect for audiophiles and professionals seeking versatile, on-the-go audio enhancement backed by a 24-month warranty. ## Description Buy 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. Free delivery and returns on eligible orders. 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. ## 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 | 24 in Headphone Amplifiers | | Box Contents | Fosi Audio SK01 | | Brand Name | Fosi Audio | | Colour | Black | | Compatible Devices | Musical Instruments with 6.35mm or 3.5 Jack Connectors | | Connector Type | 6.35mm Jack & 3.5mm Jack | | Country of Origin | China | | Customer Reviews | 4.5 4.5 out of 5 stars (455) | | Enclosure Material | Aluminum Alloy | | Item Dimensions D x W x H | 12.1D x 5.1W x 4.3H centimetres | | Manufacturer | Fosi Audio | | Manufacturer 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 | | Product Warranty | 24 months | | Unit Count | 1.0 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 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. ## 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 β€οΈπŸ’›πŸ’š 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 πŸ’― πŸ”₯πŸ”₯πŸ”₯πŸ”₯πŸ”₯πŸ”₯😁 ## 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 --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.sg/products/575548630-sk01-headphone-amplifier-equalizer-preamp-with-bass-midrange-treble-tone](https://www.desertcart.sg/products/575548630-sk01-headphone-amplifier-equalizer-preamp-with-bass-midrange-treble-tone) --- *Product available on Desertcart Singapore* *Store origin: SG* *Last updated: 2026-05-15*