{"product_id":"120x49mm-rectangular-passive-radiator-diaphragm-diy-subwoofer-speaker","title":"120×49mm Rectangular Passive Radiator Diaphragm | DIY Speaker","description":"\u003ch2\u003e120×49mm Rectangular Subwoofer Passive Radiator Diaphragm with Iron Frame\u003c\/h2\u003e\n\u003cp\u003eUpgrade your DIY Bluetooth speaker build with this precision-engineered rectangular passive radiator diaphragm. Designed as a low-frequency bass radiator, it works alongside active drivers to enhance bass response in compact enclosures — no additional amplifier channel needed. Compatible with 3–4 inch speaker builds and a perfect fit for Harman Kardon Racetrack-style Bluetooth speaker enclosures.\u003c\/p\u003e\n\n\u003ch3\u003eKey Specifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Dimensions:\u003c\/strong\u003e 121 × 48 mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSpeaker Opening:\u003c\/strong\u003e 107 × 46 mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCorner Design:\u003c\/strong\u003e Rounded (R-corner) at all four corners for a clean, flush fit\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMounting:\u003c\/strong\u003e Includes iron bracket — screw-mount installation, no glue required\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompatible With:\u003c\/strong\u003e 3–4 inch DIY Bluetooth speaker enclosures\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePackage Contents:\u003c\/strong\u003e 1 × Passive Radiator Diaphragm with Frame\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy Choose This Passive Radiator?\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLong-Stroke Design:\u003c\/strong\u003e Specially engineered for deep, accurate low-frequency reproduction\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCustom Rubber Surround:\u003c\/strong\u003e High-elasticity rubber edge for smooth, controlled excursion\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIron Plate Weight:\u003c\/strong\u003e Centrally positioned mass weight fine-tunes the resonant frequency for optimal bass output\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePremium Craftsmanship:\u003c\/strong\u003e Tightly manufactured tolerances ensure consistent performance and a professional finish\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEasy Installation:\u003c\/strong\u003e Rigid iron bracket allows secure screw-in mounting without messy adhesives\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eIdeal For\u003c\/h3\u003e\n\u003cp\u003eDIY audio enthusiasts, speaker repair technicians, and hobbyists building or restoring compact Bluetooth speakers who want powerful, clear bass from a small enclosure.\u003c\/p\u003e\n\n\u003cp\u003e\u003cem\u003eNote: This is a passive radiator diaphragm assembly — it is \u003cstrong\u003enot\u003c\/strong\u003e an active driver or horn. It must be used in conjunction with an active speaker driver.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eMade in Mainland China.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch3\u003eYou May Also Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003ca href=\"\/products\/25-in-1-precision-magnetic-screwdriver-set-pro-repair-tool-kit\"\u003e25-in-1 Precision Magnetic Screwdriver Set | Pro Repair Kit\u003c\/a\u003e — perfect for speaker assembly and electronics repair\u003c\/li\u003e\n  \u003cli\u003e\n\u003ca href=\"\/products\/34-compartment-double-sided-hardware-storage-box-removable-dividers\"\u003e34-Compartment Double-Sided Hardware Storage Box \u0026amp; Dividers\u003c\/a\u003e — keep your screws and speaker hardware organized\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.osha.gov\/personal-protective-equipment\" target=\"_blank\" rel=\"noopener\"\u003eOSHA on personal protective equipment\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What is a passive radiator diaphragm and how does it work in a DIY speaker build?\u003c\/h4\u003e\n\u003cp\u003eA: A passive radiator is an unpowered speaker cone or diaphragm that is acoustically coupled to an active driver inside a sealed or ported enclosure. When the active driver moves air, it also excites the passive radiator, which then moves in and out to reinforce low-frequency bass output. This allows compact enclosures to reproduce deeper bass than a similarly sized ported box, without requiring extra amplification or a large port tube.\u003c\/p\u003e\n\u003ch4\u003eQ: Is this passive radiator compatible with my Harman Kardon Racetrack Bluetooth speaker?\u003c\/h4\u003e\n\u003cp\u003eA: Yes — this 120×49mm rectangular passive radiator is specifically designed to be compatible with Harman Kardon Racetrack-style Bluetooth speaker enclosures. The overall dimensions are 121 × 48 mm with a speaker opening of 107 × 46 mm and rounded corners, making it a well-suited replacement or upgrade diaphragm for those speaker builds.\u003c\/p\u003e\n\u003ch4\u003eQ: Does installation require glue or adhesive?\u003c\/h4\u003e\n\u003cp\u003eA: No. This passive radiator comes with an included iron bracket that allows you to secure it in place using screws. This screw-mount method provides a more stable and removable installation compared to adhesive-only solutions, making it ideal for DIY builds and repairs.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What is a passive radiator diaphragm and how does it work in a DIY speaker build?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"A passive radiator is an unpowered speaker cone or diaphragm that is acoustically coupled to an active driver inside a sealed or ported enclosure. When the active driver moves air, it also excites the passive radiator, which then moves in and out to reinforce low-frequency bass output. 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This screw-mount method provides a more stable and removable installation compared to adhesive-only solutions, making it ideal for DIY builds and repairs.\"}}]}\u003c\/script\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"BreadcrumbList\", \"itemListElement\": [{\"@type\": \"ListItem\", \"position\": 1, \"name\": \"Home\", \"item\": \"https:\/\/sdf9i0-k1.myshopify.com\/\"}, {\"@type\": \"ListItem\", \"position\": 2, \"name\": \"Components \u0026 Modules\", \"item\": \"https:\/\/sdf9i0-k1.myshopify.com\/collections\/components-modules\"}, {\"@type\": \"ListItem\", \"position\": 3, \"name\": \"120×49mm Rectangular Passive Radiator Diaphragm | DIY Speaker\", \"item\": \"https:\/\/sdf9i0-k1.myshopify.com\/products\/120x49mm-rectangular-passive-radiator-diaphragm-diy-subwoofer-speaker\"}]}\u003c\/script\u003e","brand":"QXL","offers":[{"title":"1PCS","offer_id":46962028413127,"sku":"14:350853#1PCS","price":24.32,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0799\/8314\/9255\/files\/Sdfcea6f0c91e4d95b0c0b131c4c4050ec.webp?v=1786044880","url":"https:\/\/qxlcustomerservice.com\/products\/120x49mm-rectangular-passive-radiator-diaphragm-diy-subwoofer-speaker","provider":"QXL","version":"1.0","type":"link"}