{"product_id":"aexcvg-zk-ht21-bluetooth-amplifier-board-160w-2-220w-subwoofer-2-1-channel-aux-bluetooth-usb","title":"AEXCVG ZK-HT21 Bluetooth Amplifier Board | 160W×2 + 220W Subwoofer 2.1 Channel | AUX\/Bluetooth\/USB","description":"\u003ch2\u003eOverview\u003c\/h2\u003e\n\u003cp\u003eThe AEXCVG ZK-HT21 Bluetooth Amplifier Board is a compact 2.1 channel solution designed to bring passive speakers to life. With 160W per channel on the left and right channels and a dedicated 220W subwoofer output, the board provides ample headroom for engaging music and movie moments in small to medium rooms. Built for versatility, it accepts multiple inputs and offers a straightforward way to upgrade a passive speaker setup without needing active speakers.\u003c\/p\u003e\n\u003ch2\u003eKey Inputs and Easy Source Switching\u003c\/h2\u003e\n\u003cp\u003eDesigned for flexible wiring, the board integrates AUX, Bluetooth 5.0, USB, and Subwoofer inputs. A standard 3.5 mm AUX input lets you connect cell phones, laptops, or TVs. Bluetooth 5.0 enables quick pairing within a typical 10 m to 32 ft range, while USB input supports media play from flash drives. Note: when using AUX mode, ensure the Bluetooth connection is disconnected to avoid signal conflicts.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e3.5 mm AUX input for common devices\u003c\/li\u003e\n  \u003cli\u003eBluetooth 5.0 for wireless streaming\u003c\/li\u003e\n  \u003cli\u003eUSB input for direct media playback\u003c\/li\u003e\n  \u003cli\u003eDedicated subwoofer channel for enhanced bass\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003ePower, Protection, and Reliability\u003c\/h2\u003e\n\u003cp\u003eTwo imported TDA7498E chips deliver the main amplification, with a 2.1 channel format that supports a substantial listening experience. The board operates with a DC power range of 15–36V (undervoltage protection below 9V) and includes several safeguards to guard against common issues. If overload or abnormal conditions occur, the protection system helps protect the module and connected speakers.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eOvervoltage and undervoltage protection\u003c\/li\u003e\n  \u003cli\u003eOverheating and short-circuit safeguards\u003c\/li\u003e\n  \u003cli\u003eDC detection to prevent improper startup\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpeaker Compatibility and Setup\u003c\/h2\u003e\n\u003cp\u003eThe ZK-HT21 is designed for passive speakers in the 30–200W range with 4–8 Ω impedance. This makes it suitable for a variety of bookshelf or floorstanding speakers, enabling you to tailor the system to your room size and listening preferences. It does not natively drive Bluetooth or active speakers, so pairing decisions should consider passive speaker configurations and a compatible power supply.\u003c\/p\u003e\n\u003ch2\u003eWhat You Can Expect in Real Use\u003c\/h2\u003e\n\u003cp\u003eIn real-world setups, this board shines as a space-saving upgrade for a home theater, a dedicated music corner, or a DIY speaker project. The multifunctional control layout makes it approachable for enthusiasts who want a direct path from source to sound, with quick input selection and volume adjustments. The combination of a strong left-right pair and a dedicated subwoofer channel helps create a fuller soundstage, from crisp dialogue to immersive bass tones.\u003c\/p\u003e\n\u003ch2\u003eUsage Tips\u003c\/h2\u003e\n\u003cp\u003eConnect a DC power supply within the specified range, wire your passive speakers to the outputs, and use the dial to switch inputs and control playback. If you switch to AUX, disconnect Bluetooth first to ensure clear audio transfer. This board is aimed at passive speaker users seeking a reliable, configurable amplification solution without incorporating Bluetooth-enabled speaker models.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What speakers are compatible with the ZK-HT21 amplifier board?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Compatible with passive 30–200W speakers, 4–8 Ω; not designed for Bluetooth or active speakers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: How do I switch inputs and control playback on the ZK-HT21?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Use the multifunctional dial to switch inputs (Bluetooth, AUX, USB) and to play\/pause, skip, and adjust volume.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"AEXCVG","offers":[{"title":"Default Title","offer_id":48412469657757,"sku":"B0F1Y5PTWH","price":46.83,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0766\/9596\/1757\/files\/aexcvg-zk-ht21-front-panel.jpg?v=1781235213","url":"https:\/\/nexoltic.com\/products\/aexcvg-zk-ht21-bluetooth-amplifier-board-160w-2-220w-subwoofer-2-1-channel-aux-bluetooth-usb","provider":"Nexoltic","version":"1.0","type":"link"}