{"product_id":"fosi-audio-ht4s-5-channel-bluetooth-class-d-amplifier-with-optical-input-4-1-5-0-mode-and-multi-speaker-system-support","title":"Fosi Audio HT4S 5-Channel Bluetooth Class-D Amplifier with Optical Input, 4.1\/5.0 Mode, and Multi-Speaker System Support","description":"\u003cp data-start=\"206\" data-end=\"555\"\u003eThe Fosi Audio HT4S is a compact yet versatile \u003cstrong data-start=\"253\" data-end=\"288\"\u003emulti-channel Class-D amplifier\u003c\/strong\u003e designed for users who need to power multiple speakers in home, outdoor, or entertainment environments. Unlike typical stereo amps, it supports \u003cstrong data-start=\"433\" data-end=\"453\"\u003eup to 5 channels\u003c\/strong\u003e, making it ideal for distributed audio systems, small home theaters, cafés, patios, or gaming setups.\u003c\/p\u003e\n\u003cp data-start=\"557\" data-end=\"798\"\u003eIt offers flexible configuration with \u003cstrong data-start=\"595\" data-end=\"634\"\u003eswitchable 5.0 or 4.1 channel modes\u003c\/strong\u003e, allowing you to run five full-range speakers or dedicate one channel to a passive subwoofer for enhanced bass performance. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"800\" data-end=\"1059\"\u003ePowered by \u003cstrong data-start=\"811\" data-end=\"851\"\u003edual TPA3116 Class-D amplifier chips\u003c\/strong\u003e, the HT4S delivers efficient output with low distortion, providing \u003cstrong data-start=\"919\" data-end=\"973\"\u003e30W × 5 (5.0 mode) or 30W × 4 + 60W sub (4.1 mode)\u003c\/strong\u003e—suitable for small-to-medium speaker systems. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"1061\" data-end=\"1274\"\u003eConnectivity is highly flexible, featuring \u003cstrong data-start=\"1104\" data-end=\"1159\"\u003eBluetooth, optical (Toslink), and 3.5 mm AUX inputs\u003c\/strong\u003e, allowing integration with TVs, smartphones, streamers, and media players. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"1276\" data-end=\"1448\"\u003eThe unit also includes a \u003cstrong data-start=\"1301\" data-end=\"1319\"\u003e3.5 mm pre-out\u003c\/strong\u003e, enabling connection to an active subwoofer for expanded systems such as \u003cstrong data-start=\"1393\" data-end=\"1407\"\u003e5.1 setups\u003c\/strong\u003e. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"1450\" data-end=\"1641\"\u003eA built-in \u003cstrong data-start=\"1461\" data-end=\"1477\"\u003epower supply\u003c\/strong\u003e, remote control, and intuitive front-panel interface make operation simple, while the durable aluminum chassis ensures reliability for both indoor and outdoor use.\u003c\/p\u003e\n\u003chr data-start=\"1643\" data-end=\"1646\"\u003e\n\u003ch2 data-section-id=\"155rk9w\" data-start=\"1648\" data-end=\"1680\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"1651\" data-end=\"1678\"\u003ePerformance Highlights:\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp data-start=\"1681\" data-end=\"1921\"\u003e• 5-channel amplifier (5.0 or 4.1 configuration)\u003cbr data-start=\"1729\" data-end=\"1732\"\u003e• Class-D design with dual TPA3116 chips\u003cbr data-start=\"1772\" data-end=\"1775\"\u003e• Bluetooth + Optical + AUX inputs\u003cbr data-start=\"1809\" data-end=\"1812\"\u003e• Pre-out for active subwoofer (expandable system)\u003cbr data-start=\"1862\" data-end=\"1865\"\u003e• Compact all-in-one design with built-in power supply\u003c\/p\u003e\n\u003chr data-start=\"1923\" data-end=\"1926\"\u003e\n\u003ch2 data-section-id=\"7p9fey\" data-start=\"1928\" data-end=\"1966\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"1931\" data-end=\"1966\"\u003eWhy You Should Buy This Product\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp data-start=\"1968\" data-end=\"2245\"\u003e• ⭐ Perfect for multi-speaker setups (patio, café, home theater)\u003cbr data-start=\"2032\" data-end=\"2035\"\u003e• ⭐ More flexible than standard stereo amplifiers\u003cbr data-start=\"2084\" data-end=\"2087\"\u003e• ⭐ Optical input makes it ideal for TV connection\u003cbr data-start=\"2137\" data-end=\"2140\"\u003e• ⭐ Compact and easy to install (no external PSU brick)\u003cbr data-start=\"2195\" data-end=\"2198\"\u003e• ⭐ Great value for distributed audio systems\u003c\/p\u003e\n\u003chr data-start=\"2247\" data-end=\"2250\"\u003e\n\u003ch2 data-section-id=\"1j5qwet\" data-start=\"2252\" data-end=\"2271\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"2255\" data-end=\"2271\"\u003eKey Features\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp data-start=\"2273\" data-end=\"2601\"\u003e• 4.1 \/ 5.0 channel Class-D amplifier\u003cbr data-start=\"2310\" data-end=\"2313\"\u003e• Dual TPA3116 amplifier chips\u003cbr data-start=\"2343\" data-end=\"2346\"\u003e• Bluetooth wireless streaming\u003cbr data-start=\"2376\" data-end=\"2379\"\u003e• Optical (Toslink) digital input\u003cbr data-start=\"2412\" data-end=\"2415\"\u003e• 3.5 mm AUX input\u003cbr data-start=\"2433\" data-end=\"2436\"\u003e• 5 speaker outputs + subwoofer support\u003cbr data-start=\"2475\" data-end=\"2478\"\u003e• 3.5 mm pre-out (active subwoofer)\u003cbr data-start=\"2513\" data-end=\"2516\"\u003e• Remote control included\u003cbr data-start=\"2541\" data-end=\"2544\"\u003e• LED mode indicator lighting\u003cbr data-start=\"2573\" data-end=\"2576\"\u003e• Full aluminum chassis\u003c\/p\u003e\n\u003chr data-start=\"2603\" data-end=\"2606\"\u003e\n\u003ch2 data-section-id=\"id1bjs\" data-start=\"2608\" data-end=\"2639\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"2611\" data-end=\"2639\"\u003eTechnical Specifications\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp data-start=\"2641\" data-end=\"2745\"\u003e\u003cstrong data-start=\"2641\" data-end=\"2652\"\u003eGeneral\u003c\/strong\u003e\u003cbr data-start=\"2652\" data-end=\"2655\"\u003e• Product Type: Multi-Channel Integrated Amplifier\u003cbr data-start=\"2705\" data-end=\"2708\"\u003e• Brand: Fosi Audio\u003cbr data-start=\"2727\" data-end=\"2730\"\u003e• Model: HT4S\u003c\/p\u003e\n\u003cp data-start=\"2747\" data-end=\"3208\"\u003e\u003cstrong data-start=\"2747\" data-end=\"2770\"\u003eAudio \u0026amp; Performance\u003c\/strong\u003e\u003cbr data-start=\"2770\" data-end=\"2773\"\u003e• Amplifier Type: Class-D (TPA3116 ×2)\u003cbr data-start=\"2811\" data-end=\"2814\"\u003e• Channels: 5.0 \/ 4.1 selectable\u003cbr data-start=\"2846\" data-end=\"2849\"\u003e• Output Power:\u003cbr data-start=\"2864\" data-end=\"2867\"\u003e • 5.0 Mode: 30W × 5 @ 4Ω\u003cbr data-start=\"2892\" data-end=\"2895\"\u003e • 4.1 Mode: 30W × 4 + 60W sub @ 4Ω \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003cbr data-start=\"2968\" data-end=\"2971\"\u003e• Max Output: Up to 50W × 5 @ 4Ω \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003cbr data-start=\"3041\" data-end=\"3044\"\u003e• Frequency Response: 20 Hz – 20 kHz\u003cbr data-start=\"3080\" data-end=\"3083\"\u003e• THD: ≤0.03% \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003cbr data-start=\"3134\" data-end=\"3137\"\u003e• Signal-to-Noise Ratio: ≥88 dB \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"3210\" data-end=\"3302\"\u003e\u003cstrong data-start=\"3210\" data-end=\"3226\"\u003eConnectivity\u003c\/strong\u003e\u003cbr data-start=\"3226\" data-end=\"3229\"\u003e• Bluetooth: Yes\u003cbr data-start=\"3245\" data-end=\"3248\"\u003e• Optical Input: Yes (Toslink)\u003cbr data-start=\"3278\" data-end=\"3281\"\u003e• AUX Input: 3.5 mm\u003c\/p\u003e\n\u003cp data-start=\"3304\" data-end=\"3437\"\u003e\u003cstrong data-start=\"3304\" data-end=\"3315\"\u003eOutputs\u003c\/strong\u003e\u003cbr data-start=\"3315\" data-end=\"3318\"\u003e• Speaker Outputs: 5 channels\u003cbr data-start=\"3347\" data-end=\"3350\"\u003e• Subwoofer Output: Passive (4.1 mode)\u003cbr data-start=\"3388\" data-end=\"3391\"\u003e• Pre-Out: 3.5 mm (active subwoofer support)\u003c\/p\u003e\n\u003cp data-start=\"3439\" data-end=\"3529\"\u003e\u003cstrong data-start=\"3439\" data-end=\"3448\"\u003ePower\u003c\/strong\u003e\u003cbr data-start=\"3448\" data-end=\"3451\"\u003e• Power Supply: Built-in AC (110–240V)\u003cbr data-start=\"3489\" data-end=\"3492\"\u003e• Efficiency: High (Class-D design)\u003c\/p\u003e\n\u003cp data-start=\"3531\" data-end=\"3743\"\u003e\u003cstrong data-start=\"3531\" data-end=\"3552\"\u003ePhysical \u0026amp; Design\u003c\/strong\u003e\u003cbr data-start=\"3552\" data-end=\"3555\"\u003e• Chassis Material: Aluminum alloy\u003cbr data-start=\"3589\" data-end=\"3592\"\u003e• Dimensions: ~284 × 178 × 100 mm \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003cbr data-start=\"3663\" data-end=\"3666\"\u003e• Weight: ~1.8 kg \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003cbr data-start=\"3723\" data-end=\"3726\"\u003e• Finish: Black\u003c\/p\u003e\n\u003chr data-start=\"3745\" data-end=\"3748\"\u003e\n\u003ch2 data-section-id=\"rizf6l\" data-start=\"3750\" data-end=\"3765\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"3753\" data-end=\"3765\"\u003eIncluded\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp data-start=\"3767\" data-end=\"3910\"\u003e• 1 × Fosi Audio HT4S Amplifier\u003cbr data-start=\"3798\" data-end=\"3801\"\u003e• 1 × Power Cable\u003cbr data-start=\"3818\" data-end=\"3821\"\u003e• 1 × Bluetooth Antenna\u003cbr data-start=\"3844\" data-end=\"3847\"\u003e• 1 × 3.5 mm AUX Cable\u003cbr data-start=\"3869\" data-end=\"3872\"\u003e• 1 × Remote Control\u003cbr data-start=\"3892\" data-end=\"3895\"\u003e• User Manual\u003c\/p\u003e","brand":"Fosi Audio","offers":[{"title":"Default Title","offer_id":52892801335615,"sku":"HT4S","price":13999.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0014\/5942\/1272\/files\/51Iqgx-WUaL._SL1500.jpg?v=1777728528","url":"https:\/\/audiomaxx.in\/products\/fosi-audio-ht4s-5-channel-bluetooth-class-d-amplifier-with-optical-input-4-1-5-0-mode-and-multi-speaker-system-support","provider":"Audiomaxx India","version":"1.0","type":"link"}