{"product_id":"hosyond-zk-ht21-2-1-tda7498e-bluetooth-amplifier","title":"Hosyond ZK-HT21 2.1 TDA7498E Bluetooth Amplifier","description":"\u003cp\u003e\u003cstrong\u003eHosyond ZK-HT21 is a 2.1-channel amplifier board that delivers two 160W stereo channels plus a 220W subwoofer output with Bluetooth, AUX and USB inputs and adjustable treble and bass.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis compact power amplifier module combines a TDA7498E class-AB power stage with modern connectivity and hardware tone controls for DIY speakers, desktop hi‑fi builds, and compact home audio systems. Designed to accept DC15–36V supplies and to drive 4–8Ω loudspeakers from 30–200W, the ZK-HT21 balances raw output capability with protection features such as reverse-polarity, overcurrent, overtemperature, short-circuit, and undervoltage safeguards.\u003c\/p\u003e\n\n\u003ch3\u003eHow do I connect music sources to the ZK-HT21?\u003c\/h3\u003e\n\u003cp\u003eThe ZK-HT21 supports three input methods so you can switch between sources without swapping hardware. A rotary dial on the board lets you select Bluetooth pairing, a wired AUX line-in, or USB audio playback easily.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eBluetooth: wireless audio from phones, tablets, and computers.\u003c\/li\u003e\n  \u003cli\u003eAUX: 3.5mm or RCA line-level connection for legacy devices.\u003c\/li\u003e\n  \u003cli\u003eUSB: direct playback from supported USB flash media (board-dependent codec support).\u003c\/li\u003e\n  \u003cli\u003eOn-board dial: quick input switching and basic playback control.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat output power and speaker types can I use with this amplifier?\u003c\/h3\u003e\n\u003cp\u003eThis module provides two high-power channels and a dedicated sub output, making it suitable for a 2.1 speaker configuration that wants punch and clarity. It’s intended to drive speakers rated roughly 30–200W with 4–8Ω impedance for optimal performance.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eLeft\/right channels: up to 160W each (depending on supply voltage and speaker load).\u003c\/li\u003e\n  \u003cli\u003eSubwoofer output: up to 220W for low-frequency extension.\u003c\/li\u003e\n  \u003cli\u003eBest used with 4–8Ω drivers; avoid lower impedances to prevent stress on the amp.\u003c\/li\u003e\n  \u003cli\u003eMatch speaker power ratings to supply voltage for reliable output.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat power supplies and protections does the board require?\u003c\/h3\u003e\n\u003cp\u003eThe ZK-HT21 accepts a broad DC input range and includes multiple safety systems to protect both the board and connected speakers. It works well with higher-voltage DC supplies for peak power while protecting itself if voltage falls too low.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSupported input: DC 15–36V; optional operation down to 12V for lower-power setups.\u003c\/li\u003e\n  \u003cli\u003eUndervoltage protection triggers below about 9V to avoid unstable operation.\u003c\/li\u003e\n  \u003cli\u003eBuilt-in safeguards: anti-reverse polarity, overcurrent, overheating, and short-circuit protection.\u003c\/li\u003e\n  \u003cli\u003eUse a quality DC adapter rated for sustained current to reach advertised outputs.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow can I control tone and tailor sound to my room?\u003c\/h3\u003e\n\u003cp\u003eThe module includes physical treble and bass adjustment controls so you can shape the tonal balance without adding extra DSP hardware. These knobs let you boost or cut frequencies quickly while auditioning speaker placement or room treatment changes.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eTreble control: refine high-frequency clarity and air.\u003c\/li\u003e\n  \u003cli\u003eBass control: increase sub punch or reduce boominess to suit the room.\u003c\/li\u003e\n  \u003cli\u003eInstant results: adjustments are analog and immediate for quick tuning.\u003c\/li\u003e\n  \u003cli\u003eCombine with speaker placement and crossover tuning for best sub integration.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for? The Hosyond ZK-HT21 is aimed at hobbyists, DIY audio builders, and small-system integrators who need a compact, powerful 2.1 amplifier with modern inputs and hands-on tone control. If you want to build a bookshelf or desktop 2.1 system, upgrade an old active setup, or add a high-current sub amp to a custom enclosure, this board gives flexible connectivity, robust protection, and high output in a straightforward package.\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 voltage does the ZK-HT21 require?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Use DC 15–36V for full performance; it can run at 12V but has undervoltage protection below about 9V.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Which speaker impedance is recommended?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: The board is compatible with 4–8Ω speakers, ideally 30–200W rated drivers for reliable operation.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Hosyond","offers":[{"title":"Default Title","offer_id":48413379657885,"sku":"B0CCV9BXWG","price":46.83,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0766\/9596\/1757\/files\/hosyond-zk-ht21-front-view.jpg?v=1781262260","url":"https:\/\/nexoltic.com\/products\/hosyond-zk-ht21-2-1-tda7498e-bluetooth-amplifier","provider":"Nexoltic","version":"1.0","type":"link"}