{"product_id":"400w-2-1-channel-car-audio-stereo-amplifier-12v-hifi","title":"400 Watt 2.1 Channel Car Audio Stereo Amplifier, 12V Class A\/B HIFI Power Amp with RCA \u0026 AUX Input, Subwoofer Output, Cast Iron Build, 20Wx2+40W RMS, 4-8Ω Speaker Compatible, Model ST-838","description":"\u003ch2\u003e400W 2.1 Channel Class A\/B HIFI Car Audio Stereo Amplifier — Pure Power, Pure Sound\u003c\/h2\u003e\u003cp\u003eUpgrade your car or home audio setup with the \u003cstrong\u003eST-838 400W 2.1 Channel HIFI Power Amplifier\u003c\/strong\u003e. Built with a durable \u003cstrong\u003ecast iron body\u003c\/strong\u003e and engineered for Class A\/B performance, this amplifier delivers clean, powerful audio across two speakers and a dedicated subwoofer channel. With \u003cstrong\u003e20W x 2 RMS + 40W subwoofer output\u003c\/strong\u003e, a wide frequency response of 20Hz–20KHz, and ultra-low 0.4% distortion, the ST-838 is designed for audiophiles who demand precision. Compatible with 4–8Ω speakers and powered by DC 12V, it's equally at home in your vehicle or on your desktop.\u003c\/p\u003e\u003ch2\u003eWhy You'll Love It\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e🔊 \u003cstrong\u003eClass A\/B HIFI Performance\u003c\/strong\u003e — 20W x 2 + 40W subwoofer RMS power (200W + 200W max) for rich, full-range audio\u003c\/li\u003e\n\u003cli\u003e🎵 \u003cstrong\u003e2.1 Channel Output\u003c\/strong\u003e — Connect 2 stereo speakers + 1 subwoofer simultaneously for immersive sound\u003c\/li\u003e\n\u003cli\u003e🔌 \u003cstrong\u003eVersatile Input Options\u003c\/strong\u003e — Stereo L\/R RCA and 3.5mm AUX input for easy connection to any audio source\u003c\/li\u003e\n\u003cli\u003e🛡️ \u003cstrong\u003eCast Iron Build\u003c\/strong\u003e — Rugged, heat-dissipating construction for long-lasting durability\u003c\/li\u003e\n\u003cli\u003e📊 \u003cstrong\u003eHigh Fidelity Specs\u003c\/strong\u003e — 20Hz–20KHz frequency response, 0.4% THD, 80dB SNR, 47K resolution\u003c\/li\u003e\n\u003cli\u003e⚡ \u003cstrong\u003eDC 12V Powered\u003c\/strong\u003e — Ideal for car audio systems and 12V desktop setups\u003c\/li\u003e\n\u003cli\u003e🔉 \u003cstrong\u003e4–8Ω Speaker Compatible\u003c\/strong\u003e — Works with a wide range of aftermarket car and home speakers\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpec\u003c\/th\u003e\n\u003cth\u003eDetails\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eST-838\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eCast Iron\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003e2.1 Channel Class A\/B HIFI Power Amplifier\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Voltage\u003c\/td\u003e\n\u003ctd\u003eDC 12V \/ 2A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRMS Power\u003c\/td\u003e\n\u003ctd\u003e20W x 2 + 40W (Subwoofer)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Power\u003c\/td\u003e\n\u003ctd\u003e200W + 200W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAudio Input\u003c\/td\u003e\n\u003ctd\u003eStereo L\/R RCA \/ 3.5mm AUX\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAudio Output\u003c\/td\u003e\n\u003ctd\u003eCable Speaker Jacks + Subwoofer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpeaker Impedance\u003c\/td\u003e\n\u003ctd\u003e4–8Ω\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFrequency Response\u003c\/td\u003e\n\u003ctd\u003e20Hz – 20KHz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDistortion (THD)\u003c\/td\u003e\n\u003ctd\u003e0.4%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSNR\u003c\/td\u003e\n\u003ctd\u003e80dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResolution\u003c\/td\u003e\n\u003ctd\u003e47K\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBluetooth\u003c\/td\u003e\n\u003ctd\u003eNot Supported\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePackage\u003c\/td\u003e\n\u003ctd\u003e1x Power Amplifier, 1x User Manual\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eQ: Who is this amplifier best suited for?\u003c\/strong\u003e\u003cbr\u003eA: The ST-838 is ideal for car audio enthusiasts, audiophiles, and DIY home theater builders who want a compact, high-fidelity 2.1 channel amplifier at an accessible price point.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: Can I use this amplifier at home, not just in a car?\u003c\/strong\u003e\u003cbr\u003eA: Yes! As long as you have a 12V DC power supply (sold separately), this amplifier works perfectly as a desktop or home audio amp for bookshelf speakers and a subwoofer.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: Is this a good gift for an audiophile or car enthusiast?\u003c\/strong\u003e\u003cbr\u003eA: Absolutely. Its HIFI Class A\/B performance, cast iron build, and 2.1 channel capability make it a standout gift for anyone serious about audio quality — great for birthdays, Father's Day, or Christmas.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: How do I connect my audio source to this amplifier?\u003c\/strong\u003e\u003cbr\u003eA: Connect your head unit or audio device using the stereo L\/R RCA inputs or the 3.5mm AUX input. Then connect your speakers via the cable speaker jacks and your subwoofer to the dedicated subwoofer output.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: What speakers are compatible with this amplifier?\u003c\/strong\u003e\u003cbr\u003eA: Any 4–8Ω impedance speakers are compatible. This covers the vast majority of aftermarket car speakers and many home bookshelf speakers.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: Is this amplifier good for learning about audio electronics or STEM?\u003c\/strong\u003e\u003cbr\u003eA: Yes! The ST-838 is a great hands-on introduction to audio amplification, Class A\/B circuit design, and speaker impedance matching — making it an excellent educational tool for electronics hobbyists and STEM learners.\u003c\/p\u003e\u003ch2\u003eFast US Shipping\u003c\/h2\u003e\u003cp\u003eShips from US warehouse, free delivery 2-7 business days.\u003c\/p\u003e","brand":"Smart Tech Nest","offers":[{"title":"Silvery","offer_id":44468854292531,"sku":null,"price":46.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0678\/0937\/8355\/files\/bc8caecba2f369401674b91baf7983a5.jpg?v=1783244464","url":"https:\/\/smarttechnest.com\/products\/400w-2-1-channel-car-audio-stereo-amplifier-12v-hifi","provider":"Smart Tech Nest","version":"1.0","type":"link"}