{"product_id":"arrarown-zk-tb21-2-1-bluetooth-50w-2-100w-sub-amp","title":"ARRAROWN ZK-TB21 2.1 Bluetooth 50W×2 +100W Sub Amp","description":"\u003cp\u003e\u003cstrong\u003eThe ARRAROWN ZK-TB21 is a compact 2.1 Bluetooth 5.0 amplifier board that delivers 50W per stereo channel plus 100W for a subwoofer, with onboard treble and bass adjustment and multiple safety protections.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis small-form digital amp module is built for DIY home audio projects and upgrades where wireless streaming, a dedicated low-frequency channel, and hands-on tone control are priorities. The board combines Bluetooth 5.0 wireless input and a wired AUX option, a feature set intended to power bookshelf speakers, custom cabinets, or desktop systems with cleaner output and adjustable tonal balance.\u003c\/p\u003e\n\n\u003ch3\u003eHow does the ZK-TB21 connect to sources and speakers?\u003c\/h3\u003e\n\u003cp\u003eThe module supports Bluetooth 5.0 for wireless audio streaming and includes a separate AUX input for wired devices. It outputs in 2.1-channel configuration—left and right stereo channels plus a dedicated subwoofer output—so you can drive two satellite speakers and one powered or passive subwoofer with a crossover.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eBluetooth 5.0 wireless pairing for phones, tablets, and laptops\u003c\/li\u003e\n  \u003cli\u003e3.5mm or RCA AUX input for non-Bluetooth sources\u003c\/li\u003e\n  \u003cli\u003eDedicated speaker terminals for left, right, and subwoofer outputs\u003c\/li\u003e\n  \u003cli\u003eUse AUX only after disconnecting Bluetooth to prevent input conflicts\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat tonal controls and sound-quality features are available?\u003c\/h3\u003e\n\u003cp\u003eThe board has independent treble and bass adjustment knobs, letting you shape highs and lows without changing the playback device. Internally, a low-noise front-stage op-amp and shielding components help reduce interference and deliver clearer midrange and sub-bass performance.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eOnboard bass and treble controls for quick tonal tweaks\u003c\/li\u003e\n  \u003cli\u003eLow-noise preamp stage to minimize hiss and distortion\u003c\/li\u003e\n  \u003cli\u003eShielding and inductance design to suppress AM interference\u003c\/li\u003e\n  \u003cli\u003e2.1 architecture separates bass duties to the subwoofer for tighter low end\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eIs the amplifier safe and easy to install for DIY builds?\u003c\/h3\u003e\n\u003cp\u003eThe ZK-TB21 includes multiple protective circuits—over-voltage, under-voltage, over-temperature, and short-circuit protection—plus a fitted case with interface labels printed on the plate. Its small footprint and clearly marked connectors make mounting into speaker cabinets or compact enclosures straightforward even for first-time builders.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eProtection against voltage faults, overheating, and shorts\u003c\/li\u003e\n  \u003cli\u003eCompact dimensions (about 4.72 × 3.94 × 0.7 in) for tight builds\u003c\/li\u003e\n  \u003cli\u003ePrinted interface labels on the protective plate speed installation\u003c\/li\u003e\n  \u003cli\u003eIncludes shielding and filtering for more stable operation\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for? The ARRAROWN ZK-TB21 is aimed at hobbyists and small-scale installers who want a modern Bluetooth-capable 2.1 amp for custom speakers, desktop audio systems, or refitted vintage enclosures. It suits anyone looking for stronger bass management via a dedicated sub channel, hands-on tone control at the amplifier, and a compact unit that offers robust protections. Avoid using the AUX input while the board remains paired to Bluetooth—best practice is to clear the wireless connection before switching to wired sources.\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: Can I use Bluetooth and AUX at the same time?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No. To use AUX reliably, disconnect the board's Bluetooth connection first to prevent input conflicts.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What speaker power does each channel provide?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: The amplifier supplies about 50W to each left and right channel and about 100W to a dedicated subwoofer channel.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"ARRAROWN","offers":[{"title":"Default Title","offer_id":48413245178013,"sku":"B08G1NZF3Y","price":38.59,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0766\/9596\/1757\/files\/arrarown-zk-tb21-front-panel.jpg?v=1781259029","url":"https:\/\/nexoltic.com\/products\/arrarown-zk-tb21-2-1-bluetooth-50w-2-100w-sub-amp","provider":"Nexoltic","version":"1.0","type":"link"}