{"product_id":"bluetooth-digital-amplifier-board-subwoofer-mt21-audio-receiver-module-for-home-diy-speaker-system","title":"Bluetooth Digital Amplifier Board Subwoofer MT21 Audio Receiver Module for Home DIY Speaker System","description":"\u003ch1\u003eBluetooth Digital Amplifier Board MT21 for DIY Subwoofer and Speaker Projects\u003c\/h1\u003e\u003cdiv style=\"text-align: center;\"\u003e\u003cimg alt=\"MT21 Bluetooth digital amplifier board PCB with 324 communication interface for DIY subwoofer speaker project\" src=\"https:\/\/images.seoo.uk\/src\/products\/shopify_export\/US10\/7323\/2025-11-17\/original-image\/20b6d81a-864a-473c-a4a2-bf2726c53d47_trans.webp\"\u003e\u003c\/div\u003e\u003cp\u003eThis Bluetooth digital amplifier board brings wireless audio streaming to your home DIY speaker builds. The MT21 model is designed to integrate directly into passive subwoofer enclosures or full-range speaker cabinets, allowing you to upgrade traditional wired systems to Bluetooth-compatible devices. With a 324-type communication interface and a built-in digital amplifier chip, the board delivers clear sound output for music, podcasts, and other audio content. Its compact PCB footprint makes installation straightforward for hobbyists and makers.\u003c\/p\u003e\u003ch2\u003eFeatures and Construction\u003c\/h2\u003e\u003cdiv style=\"text-align: center;\"\u003e\u003cimg alt=\"MT21 Bluetooth digital amplifier board PCB with 324 communication interface for DIY subwoofer speaker project\" src=\"https:\/\/images.seoo.uk\/src\/products\/shopify_export\/US10\/7323\/2025-11-17\/original-image\/49083e5b-2711-499e-ae5c-7d4f72a7805c_042cf92b-12b1-4d70-86be-a54a0b4f573e.webp\"\u003e\u003c\/div\u003e\u003cp\u003eThe board combines Bluetooth reception and digital amplification on a single PCB, minimising the need for separate modules. The MT21 is built for straightforward integration into existing or custom enclosures.\u003c\/p\u003e\u003ch3\u003eMaterial and Build\u003c\/h3\u003e\u003cp\u003eThe board uses a standard PCB with surface-mounted electronic components, including the Bluetooth receiver module and digital amplifier IC. The 324-type communication interface provides a simple terminal block for connecting speaker wires.\u003c\/p\u003e\u003ch3\u003eSize and Practical Fit\u003c\/h3\u003e\u003cp\u003eNo exact dimensions are provided in the source text, but the board is described as compact enough for enclosure mounting. Users should measure their available space before purchase.\u003c\/p\u003e\u003ch2\u003eUses and Placement\u003c\/h2\u003e\u003cdiv style=\"text-align: center;\"\u003e\u003cimg alt=\"MT21 Bluetooth digital amplifier board PCB with 324 communication interface for DIY subwoofer speaker project\" src=\"https:\/\/images.seoo.uk\/src\/products\/shopify_export\/US10\/7323\/2025-11-17\/original-image\/54afe10b-6c7b-42e6-a0ff-6b99091345c9.webp\"\u003e\u003c\/div\u003e\u003cp\u003eThe MT21 is suitable for converting passive speakers into Bluetooth-enabled units for home audio setups. It works with subwoofers and full-range speakers.\u003c\/p\u003e\u003ch3\u003eEvent or Professional Use\u003c\/h3\u003e\u003cp\u003eIdeal for small events or presentations where wired speaker systems need temporary wireless audio input. The board can be installed in portable speaker cabinets used for background music or announcements.\u003c\/p\u003e\u003ch3\u003eEveryday Home Use\u003c\/h3\u003e\u003cp\u003ePerfect for DIY enthusiasts building custom bookshelf speakers, subwoofer boxes, or integrated audio furniture. The board adds streaming convenience to otherwise passive speaker systems.\u003c\/p\u003e\u003ch2\u003eBenefits and Buying Value\u003c\/h2\u003e\u003cdiv style=\"text-align: center;\"\u003e\u003cimg alt=\"MT21 Bluetooth digital amplifier board PCB with 324 communication interface for DIY subwoofer speaker project\" src=\"https:\/\/images.seoo.uk\/src\/products\/shopify_export\/US10\/7323\/2025-11-17\/original-image\/8039ba4c-344e-4715-bf0f-1b6db1a5169a_trans_08c4459f-0302-472a-b9b4-354bff3d8b16.webp\"\u003e\u003c\/div\u003e\u003cp\u003eBluetooth audio boards like the MT21 offer a cost-effective way to modernise existing speaker hardware without purchasing new active speakers. The digital amplifier reduces power consumption compared to traditional analogue circuits.\u003c\/p\u003e\u003ch3\u003eReuse and Low Maintenance\u003c\/h3\u003e\u003cp\u003eThe board requires no regular maintenance beyond occasional cleaning of the enclosure vents. Bluetooth firmware is built-in and does not need updates for basic operation.\u003c\/p\u003e\u003ch3\u003eWhy Choose This Product\u003c\/h3\u003e\u003cp\u003eThe MT21 provides a straightforward, no-app-required solution for adding Bluetooth to DIY speaker projects. Its compact design fits into most enclosures, and the 324 interface simplifies wiring.\u003c\/p\u003e\u003cdiv style=\"text-align: center;\"\u003e\u003cimg alt=\"MT21 Bluetooth digital amplifier board PCB with 324 communication interface for DIY subwoofer speaker project\" src=\"https:\/\/images.seoo.uk\/src\/products\/shopify_export\/US10\/7323\/2025-11-17\/original-image\/8d5a5ed1-e48f-4e03-aaf8-85ac7a4c6fd8_fine.webp\"\u003e\u003c\/div\u003e\u003cdiv style=\"text-align: center;\"\u003e\u003cimg alt=\"MT21 Bluetooth digital amplifier board PCB with 324 communication interface for DIY subwoofer speaker project\" src=\"https:\/\/images.seoo.uk\/src\/products\/shopify_export\/US10\/7323\/2025-11-17\/original-image\/e3c653a5-2a9a-47b3-8d83-160c6aac84e6.webp\"\u003e\u003c\/div\u003e","brand":"i4dt8b-mk","offers":[{"title":"MT21 \/ 13 \/ 324","offer_id":56351114232193,"sku":"CJYD209663701AZ","price":28.98,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0935\/3225\/8689\/files\/8d5a5ed1-e48f-4e03-aaf8-85ac7a4c6fd8_fine.webp?v=1791130118","url":"https:\/\/shopfluxpro.com\/products\/bluetooth-digital-amplifier-board-subwoofer-mt21-audio-receiver-module-for-home-diy-speaker-system","provider":"shopfluxpro.com","version":"1.0","type":"link"}