{"product_id":"zk-502a-2-0-bluetooth-5-0-amplifier-board-50w-50w-app-control","title":"ZK-502A 2.0 Bluetooth 5.0 Amplifier Board 50W+50W - APP Control","description":"\u003cp\u003eIn this review of the ZK-502A 2.0 Bluetooth 5.0 Amplifier Board the bottom line is clear: this board is for DIY speaker builders and hobbyists who want surprisingly high output and flexible inputs in a compact package. The reviewer found the device delivers strong, clean sound for its price and offers convenient controls via Bluetooth and a dedicated Android app, making it a practical choice for custom home audio projects where app-based naming and password control matter.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual 50W Output:\u003c\/strong\u003e Delivers up to 50W per channel peak power, providing substantial volume and headroom for small to medium speakers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBluetooth 5.0:\u003c\/strong\u003e Modern wireless input with stable pairing for phone or tablet audio sources, simplifying playback without extra wiring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMultiple Inputs:\u003c\/strong\u003e Includes AUX 3.5mm, USB sound card and U flash disk support so users can play music from a variety of devices and file sources.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAndroid APP Control:\u003c\/strong\u003e The Wuzhi Audio Android app lets you rename the Bluetooth device and set a password to avoid accidental connections.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompact Form Factor:\u003c\/strong\u003e Small size makes it easy to integrate into DIY speaker cabinets or custom installations without taking much internal space.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho It's For\u003c\/h2\u003e\u003cp\u003eThe ZK-502A suits DIY audio enthusiasts, makers building powered bookshelf or portable speaker projects, and hobbyists who want app-level control over Bluetooth naming and security. It is particularly useful for setups where multiple amp boards are present and clear identification is helpful.\u003c\/p\u003e\u003cp\u003eThose who need iOS app control, advanced DSP tuning, or professional rack-mounted amplifiers should look elsewhere. Also, people who require guaranteed power-saving behavior in every environment may want to test the unit first, as a few users reported inconsistent power-on with the power saving feature.\u003c\/p\u003e\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eHigh output for size, offering solid loudness and clear midrange for DIY speakers.\u003c\/li\u003e\n\u003cli\u003eVersatile input options including Bluetooth, AUX, USB sound card and U flash disk for flexible playback.\u003c\/li\u003e\n\u003cli\u003eAndroid app control allows renaming and password protection to prevent unwanted connections.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eApp is Android only, so iPhone users cannot access the app features.\u003c\/li\u003e\n\u003cli\u003eSome customers reported occasional issues with the power saving or power-on behavior, indicating variability in that feature.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eZK-502A 2.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBluetooth Version\u003c\/td\u003e\n\u003ctd\u003eBluetooth 5.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Power\u003c\/td\u003e\n\u003ctd\u003e50W + 50W (peak)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInputs\u003c\/td\u003e\n\u003ctd\u003eBluetooth, AUX 3.5mm, USB sound card, U flash disk\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApp Control\u003c\/td\u003e\n\u003ctd\u003eWuzhi Audio app (Android only)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupply Voltage\u003c\/td\u003e\n\u003ctd\u003eDC 9-24V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eColor\u003c\/td\u003e\n\u003ctd\u003eBlack\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eOur Verdict\u003c\/h2\u003e\u003cp\u003eThe ZK-502A is a practical, budget-friendly amplifier board for DIY speakers and small home audio projects, offering impressive power for its size and useful Android app controls for Bluetooth naming and security. It represents good value for hobbyists who need flexible inputs and easy wireless setup, though iOS users and those expecting flawless power-saving behavior should be aware of the limitations.\u003c\/p\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eCan iPhone users control the amp with the app?\u003c\/strong\u003e\u003cbr\u003eNo. The Wuzhi Audio app is currently Android only, so iPhone users cannot access app features.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat inputs are supported?\u003c\/strong\u003e\u003cbr\u003eThe board supports Bluetooth 5.0, AUX 3.5mm input, USB sound card and U flash disk playback.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat power supply does it need?\u003c\/strong\u003e\u003cbr\u003eThe amplifier runs on a DC supply between 9V and 24V as specified by the product.\u003c\/p\u003e","brand":"DAJUNGUO","offers":[{"title":"Default Title","offer_id":46760609317083,"sku":"B0B5WMFHD1","price":12.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/71mQ-gdWSCL._SL1500.jpg?v=1747854581","url":"https:\/\/gearmusthave.com\/products\/zk-502a-2-0-bluetooth-5-0-amplifier-board-50w-50w-app-control","provider":"GearMustHave","version":"1.0","type":"link"}