--- product_id: 806635713 title: "ST-838 2.1CH Audio Power Amplifier, RMS 20Wx2+40W Class D Stereo Digital Audio Amp with Subwoofer Output, 80W Mini Subwoofer Amplifier Audio Stereo Bass Amp with DC12V Power Adapter - Silver" brand: "facmogu" price: "489.34 DT" currency: TND in_stock: true category: "Facmogu" url: https://www.desertcart.tn/products/806635713-st-838-2-1ch-audio-power-amplifier-rms-20wx2-40w store_origin: TN region: Tunisia --- # ST-838 2.1CH Audio Power Amplifier, RMS 20Wx2+40W Class D Stereo Digital Audio Amp with Subwoofer Output, 80W Mini Subwoofer Amplifier Audio Stereo Bass Amp with DC12V Power Adapter - Silver **Brand:** facmogu **Price:** 489.34 DT **Availability:** ✅ In Stock ## Quick Answers - **What is this?** ST-838 2.1CH Audio Power Amplifier, RMS 20Wx2+40W Class D Stereo Digital Audio Amp with Subwoofer Output, 80W Mini Subwoofer Amplifier Audio Stereo Bass Amp with DC12V Power Adapter - Silver by facmogu - **How much does it cost?** 489.34 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/806635713-st-838-2-1ch-audio-power-amplifier-rms-20wx2-40w) ## Best For - facmogu enthusiasts ## Why This Product - Trusted facmogu brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Description Product Specifications Color: Silver Rated Voltage: 12V Rated Power: 20wx2 + 40W Rated Frequency: 20-20KHz Resolution: 47K Distortion Rate: 0.4% SNR: 80dB Impedance: 4-8 Ω Material: aluminum alloy Receiving Mode: audio input Dimension: 5.9x3.6x1.4" / 15x9.1x3.7cm Package Included 1 x Amplifier 1 x 12V 3A Power Adapter 1 x User Manual ## Features - 【Mini Size but Powerful】-- Don't be fooled by its size, it’ll give your entertainment system a serious boost. With 2.1 channel output RMS 20W×2(L/R)+40W(subwoofer), which can drive most home/car/marine/outdoor passive speakers and subwoofers, and with excellent sound. Low distortion, acoustically accurate reproduction of music, which sounds smooth and full. - 【Bass & Treble & Sub Vol Control】-- Designed with main volume, treble and bass control knobs, Which for more delicate adjustment of the sound, much fun and high playability. Besides main volume, treble and bass control, sub volume control is specially designed. They allow you to control the volume of passive Subwoofer and two passive speakers separately as you wish. - 【RCA & AUX Inputs】-- With standard stereo RCA and 3.5mm AUX inputs, can be compatible with various devices, such as mobile phone, MP3, MP4, CD player, TV, computer etc. Just enjoy your music the way you want to. Besides, there's a little blue woofer alert that turns on when the woofer is beating. - 【Portable & Convenient】-- Mini Size: 5.9x3.6x1.4" / 15x9.1x3.7cm, amplifier weight: 0.66 pounds/ 0.3kg. Compact design with exquisite appearance, matt silver case looks fashionable and durable, unique structure design easy to be installed in car, marine, RV, golf cart or home, which save space and convenient to operate. - 【Great Value Choice】-- The package comes with a Facmogu DC 12V 3A adapter valued at over $10, which makes purchasing this ST-838 amplifier a very good deal. You don't have to find a adapter with 5.5x2.5mm plug in your pile of old power adapters or you don't have to pay for another one. Besides, just enjoy peace of mind with 12 months guarantee period & lifetime product support & excellent customer service. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B08L6KYTJC | | Brand Name | Facmogu | | Customer Reviews | 4.1 4.1 out of 5 stars (344) | | Manufacturer | Mo-gu | | Material Type | Aluminum Alloy | | Maximum Supply Voltage | 12 Volts (DC) | | Minimum Supply Voltage | 11 Volts (DC) | | Model | A18224-MG-US | | Mounting Type | Surface Mount | | Number of Channels | 2 | | Output Power | 80 Watts | | Part Number | A18224-MG-US | | Specification Met | FCC | | Voltage | 12 Volts | ## Product Details - **Manufacturer:** Mo-gu - **Maximum supply voltage:** 12 Volts (DC) - **Minimum supply voltage:** 11 Volts (DC) - **Mounting type:** Surface Mount - **Voltage:** 12 Volts ## Images ![ST-838 2.1CH Audio Power Amplifier, RMS 20Wx2+40W Class D Stereo Digital Audio Amp with Subwoofer Output, 80W Mini Subwoofer Amplifier Audio Stereo Bass Amp with DC12V Power Adapter - Silver - Image 1](https://m.media-amazon.com/images/I/61sgDLr3iHL.jpg) ## Available Options This product comes in different **Color** options. ## Questions & Answers **Q: How effective (or "good") is the Treble boost ? Have hearing problem, and need much more treble going to my speakers. Thanks** A: Not that good.Get a more powerful amp. **Q: How can this be a 20x2w + 40w (sub) = 80w amp if it only uses a 36 watt (12vx3a) power supply?** A: Those are likely max watts per channel assuming not all channels will run at max watts all at once. I think the stat you are looking for is RMS watts and that isnt listed **Q: Will this amp work with a pair of 20 watt 4 ohm speakers?** A: yes it will work and you have a bass hook up also if you want to use 2:1 2 speaker and 1sub woofer **Q: Can i connect a passive subwoofer to this .. or should it be an active subwoofer?** A: compatible with passive ... ## Frequently Bought Together - Facmogu ST-838 2.1CH Audio Power Amplifier, RMS 20Wx2+40W Class D Stereo Digital Audio Amp with Subwoofer Output, 80W Mini Subwoofer Amplifier Audio Stereo Bass Amp with DC12V Power Adapter - Silver - Dayton Audio TT25-8 Puck Tactile Transducer Mini Bass Shaker 8 Ohm - Dayton Audio BST-1 High Power Pro Tactile Bass Shaker 50 Watts RMS, 4 Ohms Impedance - Turn Any Surface into a Speaker System - Generates Subwoofer Lows --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.tn/products/806635713-st-838-2-1ch-audio-power-amplifier-rms-20wx2-40w](https://www.desertcart.tn/products/806635713-st-838-2-1ch-audio-power-amplifier-rms-20wx2-40w) --- *Product available on Desertcart Tunisia* *Store origin: TN* *Last updated: 2026-06-08*