--- product_id: 657411224 title: "HT4S Bluetooth Amplifier 4.1/5.0 Ch Stereo for Outdoor Speakers, 4-Channel Power Amplifier for Bass Shaker Sim Racing Cockpit, Support AUX/Optical Input with Remote Control" brand: "fosi audio" price: "€ 278.57" currency: EUR in_stock: true reviews_count: 8 category: "Fosi Audio" url: https://www.desertcart.sk/products/657411224-ht4s-bluetooth-amplifier-4-1-5-0-ch-stereo-outdoor store_origin: SK region: Slovakia --- # 4.1/5.0 channel switchable Bluetooth + AUX + Optical inputs 400W max power output HT4S Bluetooth Amplifier 4.1/5.0 Ch Stereo for Outdoor Speakers, 4-Channel Power Amplifier for Bass Shaker Sim Racing Cockpit, Support AUX/Optical Input with Remote Control **Brand:** fosi audio **Price:** € 278.57 **Availability:** ✅ In Stock ## Summary > 🎧 Elevate your soundscape — power, precision, and style in one sleek amp! ## Quick Answers - **What is this?** HT4S Bluetooth Amplifier 4.1/5.0 Ch Stereo for Outdoor Speakers, 4-Channel Power Amplifier for Bass Shaker Sim Racing Cockpit, Support AUX/Optical Input with Remote Control by fosi audio - **How much does it cost?** € 278.57 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.sk](https://www.desertcart.sk/products/657411224-ht4s-bluetooth-amplifier-4-1-5-0-ch-stereo-outdoor) ## 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 - • **Seamless Connectivity:** Effortlessly switch between Bluetooth, AUX, and optical inputs to suit any setup. - • **User-Centric Controls:** Intuitive multifunction knob and remote control for easy volume, mode, and tone adjustments. - • **Powerhouse Performance:** Delivers up to 400W across 5 channels for crystal-clear, room-filling sound. - • **Sleek & Durable Design:** Premium CNC aluminum alloy body combines minimalist style with lasting durability. - • **Immersive Multi-Channel Flexibility:** Supports 4.1 or 5.0 channel configurations, perfect for sim racing or outdoor parties. ## Overview The Fosi Audio HT4S is a compact yet powerful 4.1/5.0 channel Bluetooth amplifier delivering up to 400W total output. Designed for versatile use, it supports Bluetooth, AUX, and optical inputs, making it ideal for outdoor speakers, sim racing cockpits, and home theaters. Its user-friendly controls, durable aluminum alloy build, and flexible multi-channel output options create an immersive audio experience that fits seamlessly into any modern lifestyle. ## Description Product Description Fosi Audio HT4S Multi-Channel Integrated Power Amplifier Easily handle various audio inputs and outputs, providing up to 5 channels of output for seamless integration and flexible configurations to meet diverse audio needs. Designed for Multi-Speaker Scenarios and Sim Racing Gaming The built-in power supply design achieves minimal footprint, and the front panel indicator light adds a sense of atmosphere; whether it is simulator racing, patio parties, or immersive movie watching, The HT4S integrated amplifier is your ideal choice. Input: 3.5mm AUX, Optical, Bluetooth Output: 3.5mm Pre-Out, Passive Speakers+Subwoofer Rated Power Output: 4.1 Channel: 30w*4+60W*1 @4Ω; 5.0 Channel: 30W*5 Max Power Output: 50Wx5 @4Ω Enhance the Realism of Racing Simulator Gaming Providing strong vibrations to add a new level of immersion to your gameplay. Supports Connection to Up to 5 Bass Shakers Allowing you to experience a 360° immersive sensation in the world of racing games. Max Output Power 50W*5 Providing sufficient power output and ensuring pure sound with great clarity and separation. Integrated Functions of Infinite Rotation Long press to power the device on/off, short press to switch input modes and volume adjustment. Customize Your Favorite Sound Signature Allowing you to effortlessly restore the original sound when adjusted to the center position. For Flexible Multi-Channel System Adaptable to 5.0 or 4.1 channel audio setups indoors or outdoors. User-Friendly Design Q: HT4S Default Blue Light, Manual Mode Switch Required After Powering On Upon powering up, the indicator light will turn blue (indicating Bluetooth mode by default). You have to switch modes manually. Q: HT4S Default Blue Light, Manual Mode Switch Required After Powering On Upon powering up, the indicator light will turn blue (indicating Bluetooth mode by default). You have to switch modes manually. Q: HT4S Indicator Lights for Input Modes Input modes are color-coded for easy use: blue for Bluetooth, orange for AUX, and red for OPT. Q: HT4S Indicator Lights for Input Modes Input modes are color-coded for easy use: blue for Bluetooth, orange for AUX, and red for OPT. Q: Does the HT4S Have a Standby Function? The HT4S has no standby function. You can leave it powered on continuously. If you turn it off, you have to long-press the main volume knob for 1.5 seconds to activate the HT4S amplifier. Q: Does the HT4S Have a Standby Function? The HT4S has no standby function. You can leave it powered on continuously. If you turn it off, you have to long-press the main volume knob for 1.5 seconds to activate the HT4S amplifier. Review: Compact, Powerful & Crystal Clear! - The Fosi Audio HT4S is a fantastic little amplifier with rich, detailed sound and strong Bluetooth connectivity. It delivers clean highs, solid bass, and more power than you’d expect for its size. The build quality is premium, setup is easy, and it runs cool even after hours of use — provided you pair it with good speakers. Review: 2 months usage review - Believe that an amplifier can turn old Sony home theatre speakers alive. The original Sony system stopped working due to motherboard issue and it being some 15-16 yrs old could not be repaired. After several research and review finally bought this amplifier. Gambling 10k on this and went ahead. Have been using daily for 12-15hrs (TV usage) and there has been no issue. Listening to music has been pretty good. One issue I faced was buzzing sound after around 15 days when connected via bluetooth and Airtel set top box however with mobile that sound was not coming. So it might be the issue with the set top box itself. Currently TV and amplifier are connected with 3mm cable and has no lag in picture and speaker. ## Features - All-in-One Amp: A mini amplifier that integrates DAC and power amplification. This stereo amplifier supports up to 5 channels output, switchable between 4.1 and 5.0 channels. It features Bluetooth, AUX, and optical digital inputs, along with pre-out and support for up to 5 speaker outputs. Note: The HT4S is a stereo amplifier and does not support Dolby, DTS, or other multichannel surround sound modes - Multi-Scenario Solution: Ideal for pairing with outdoor speakers or wall-mounted speakers, perfect for setting up 2 to 5-channel audio systems in environments like patios, cafes, restaurants, bars, etc. It can also serve as a home theater or desktop HiFi system amplifier, meeting your diverse needs from indoor to outdoor settings - Enhanced Immersion: Take your sim racing and home theater experience to a whole new level! By pairing with bass shakers, its sufficient power output and bass boost help significantly enhance the realism of racing simulator games. When watching movies at home, the vibration feedback can also help you experience your movies in another dimension, making every movie feel more realistic like being in a cinema - Effortless Operation: Featuring a comprehensive user-friendly design with a built-in power supply, accompanied by remote control, supporting bass and treble tone adjustment, a multifunctional central knob for volume control, powering on/off and mode switching, LED mode indicator ambient light, etc. Enjoying music has never been easier - Elegant and Durable: Continuing Fosi Audio's tradition of an all-aluminum alloy body design, the CNC unibody construction and fine metal sandblasting process highlight a minimalist aestheticIf you encounter problems during use, please refer to our manual or contact our after-sales team, and we will have professionals to answer your questions ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0CYQ1B598 | | Best Sellers Rank | #44,996 in Electronics ( See Top 100 in Electronics ) #43 in Hi-Fi Amplifiers | | Brand | Fosi Audio | | Brand Name | Fosi Audio | | Country of Origin | China | | Customer Reviews | 3.9 out of 5 stars 302 Reviews | | Importer Contact Information | support@fosiaudio.com | | Included Components | HT4S Bluetooth Amplifier | | Item Dimensions | 15.5 x 18.3 x 5.1 Centimeters | | Item Type Name | AMPLIFIER | | Item dimensions L x W x H | 15.5 x 18.3 x 5.1 Centimeters | | Manufacturer | Fosi Audio | | Material Type | Made entirely of aluminum alloy | | Maximum Supply Voltage | 230 Volts | | Model Number | HT4S | | Mounting Type | Freestanding | | Number of Channels | 5 | | Operating Temperature | 20 Degrees Celsius | | Output Power | 400 Watts | | Package Type Name | Box | | Packer Contact Information | support@fosiaudio.com | | Specification Met | FCC | | Voltage | 230 Volts | ## Product Details - **Item dimensions L x W x H:** 15.5 x 18.3 x 5.1 Centimeters - **Manufacturer:** Fosi Audio - **Maximum Supply Voltage:** 230 Volts - **Mounting Type:** Freestanding - **Voltage:** 230 Volts ## Images ![HT4S Bluetooth Amplifier 4.1/5.0 Ch Stereo for Outdoor Speakers, 4-Channel Power Amplifier for Bass Shaker Sim Racing Cockpit, Support AUX/Optical Input with Remote Control - Image 1](https://m.media-amazon.com/images/I/51Iqgx-WUaL.jpg) ![HT4S Bluetooth Amplifier 4.1/5.0 Ch Stereo for Outdoor Speakers, 4-Channel Power Amplifier for Bass Shaker Sim Racing Cockpit, Support AUX/Optical Input with Remote Control - Image 2](https://m.media-amazon.com/images/I/81Ew7+WjOML.jpg) ![HT4S Bluetooth Amplifier 4.1/5.0 Ch Stereo for Outdoor Speakers, 4-Channel Power Amplifier for Bass Shaker Sim Racing Cockpit, Support AUX/Optical Input with Remote Control - Image 3](https://m.media-amazon.com/images/I/61m-u-v2iOL.jpg) ![HT4S Bluetooth Amplifier 4.1/5.0 Ch Stereo for Outdoor Speakers, 4-Channel Power Amplifier for Bass Shaker Sim Racing Cockpit, Support AUX/Optical Input with Remote Control - Image 4](https://m.media-amazon.com/images/I/612mTXHvxTL.jpg) ![HT4S Bluetooth Amplifier 4.1/5.0 Ch Stereo for Outdoor Speakers, 4-Channel Power Amplifier for Bass Shaker Sim Racing Cockpit, Support AUX/Optical Input with Remote Control - Image 5](https://m.media-amazon.com/images/I/81punCK7FWL.jpg) ## Questions & Answers **Q: Q: HT4S Default Blue Light, Manual Mode Switch Required After Powering On** A: Upon powering up, the indicator light will turn blue (indicating Bluetooth mode by default). You have to switch modes manually. **Q: Q: HT4S Indicator Lights for Input Modes** A: Input modes are color-coded for easy use: blue for Bluetooth, orange for AUX, and red for OPT. **Q: Q: Does the HT4S Have a Standby Function?** A: The HT4S has no standby function. You can leave it powered on continuously. If you turn it off, you have to long-press the main volume knob for 1.5 seconds to activate the HT4S amplifier. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Compact, Powerful & Crystal Clear! *by A***O on 18 October 2025* The Fosi Audio HT4S is a fantastic little amplifier with rich, detailed sound and strong Bluetooth connectivity. It delivers clean highs, solid bass, and more power than you’d expect for its size. The build quality is premium, setup is easy, and it runs cool even after hours of use — provided you pair it with good speakers. ### ⭐⭐⭐⭐ 2 months usage review *by S***. on 8 December 2025* Believe that an amplifier can turn old Sony home theatre speakers alive. The original Sony system stopped working due to motherboard issue and it being some 15-16 yrs old could not be repaired. After several research and review finally bought this amplifier. Gambling 10k on this and went ahead. Have been using daily for 12-15hrs (TV usage) and there has been no issue. Listening to music has been pretty good. One issue I faced was buzzing sound after around 15 days when connected via bluetooth and Airtel set top box however with mobile that sound was not coming. So it might be the issue with the set top box itself. Currently TV and amplifier are connected with 3mm cable and has no lag in picture and speaker. ### ⭐⭐⭐⭐⭐ Fosi audio HT4S amplifier *by P***. on 3 January 2025* This is a very good amplifier machine, it is very strong, the sound is really crystal clear, for those who think that the sound is low I would like to tell them that they should play it with an equalizer app, it will shake your house, this amplifier plays my 12" inch woofer very well ## Frequently Bought Together - Fosi Audio HT4S Bluetooth Amplifier for Outdoor Speakers, 4 Channel Power Amp for Home Theater, Outdoor Gathering, 4.1/5.0 Ch Stereo Home Audio Receiver, Supports AUX/Optical Input with Remote Control - Banana Plugs with Dual Set Screws,Black and Red Aluminum Shell,6 Pairs - Polk Audio Atrium 4 Outdoor Speakers with Powerful Bass (Pair, Black), All-Weather Durability, Broad Sound Coverage, Speed-Lock Mounting System --- ## 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.sk/products/657411224-ht4s-bluetooth-amplifier-4-1-5-0-ch-stereo-outdoor](https://www.desertcart.sk/products/657411224-ht4s-bluetooth-amplifier-4-1-5-0-ch-stereo-outdoor) --- *Product available on Desertcart Slovakia* *Store origin: SK* *Last updated: 2026-05-12*