{"product_id":"4in-subwoofer-voice-coil-d2-ohm-black-aluminum-former","title":"4in Subwoofer Voice Coil D2 Ohm - Black Aluminum Former","description":"\u003cp\u003eIn this review the 4in Subwoofer Voice Coil D2 Ohm from Springfield Speaker is evaluated for installers and hobbyists who need a robust, custom replacement voice coil. The bottom line: this is a purpose-built, high-RMS voice coil that excels where power handling and fit are the priority. Our review found the black anodized aluminum former and flat aluminum windings deliver a compact, heat-tolerant package suited to heavy-duty subwoofer builds, and the 3.965in inner diameter is the key spec to check against your driver's requirements.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n \u003cli\u003e\n\u003cstrong\u003eCustom-made fit:\u003c\/strong\u003e Built specifically for applications that require a 3.965in inner diameter, reducing the need for modification during installation.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eBlack anodized aluminum former:\u003c\/strong\u003e Provides corrosion resistance and a rigid, lightweight core that helps maintain coil shape under heat and mechanical stress.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eFlat aluminum windings:\u003c\/strong\u003e Improve thermal transfer and allow tighter winding density for reliable operation at high power.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eHigh RMS power handling:\u003c\/strong\u003e Rated for 1800W+ RMS, making it suitable for demanding subwoofer setups and long-term heavy use.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eD2 impedance:\u003c\/strong\u003e The D2 2 ohm configuration is compatible with many powerful amplifier setups commonly used in home and car subwoofer systems.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThis voice coil is aimed at audio technicians, DIY speaker rebuilders, and enthusiasts who need a high-power replacement coil with a precise 3.965in inner diameter. It works well for custom subwoofer repairs where the original coil is damaged or when building a new driver that calls for a compact, power-dense coil.\u003c\/p\u003e\n\u003cp\u003eThose who should look elsewhere include buyers seeking an OEM direct-replacement guaranteed to match a specific factory part number, or users who need a coil with different impedance or a larger diameter. Also, people who prefer copper windings for different electrical characteristics may prefer other options.\u003c\/p\u003e\n\n\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n \u003cli\u003eExcellent heat tolerance from the black anodized aluminum former and flat aluminum windings for sustained high-power use.\u003c\/li\u003e\n \u003cli\u003eCustom 3.965in I.D. fit minimizes modification time and ensures a precise installation in compatible drivers.\u003c\/li\u003e\n \u003cli\u003eVery high RMS power handling of 1800W+ makes it appropriate for demanding subwoofer applications.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n \u003cli\u003eNot an OEM part, so exact interchangeability with factory coils is not guaranteed and fit should be verified before purchase.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n \u003ctr\u003e\n\u003ctd\u003eProduct type\u003c\/td\u003e\n\u003ctd\u003e4in subwoofer voice coil\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eInner diameter (I.D.)\u003c\/td\u003e\n\u003ctd\u003e3.965in\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eFormer material\u003c\/td\u003e\n\u003ctd\u003eBlack anodized aluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eWinding type\u003c\/td\u003e\n\u003ctd\u003eFlat aluminum windings\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003ePower handling\u003c\/td\u003e\n\u003ctd\u003e1800W+ RMS\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eImpedance\u003c\/td\u003e\n\u003ctd\u003eD2 2 ohm\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eCustom-made for applications matching above specs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe Springfield Speaker 4in Subwoofer Voice Coil is a practical choice for anyone building or repairing high-power subs who needs a tight 3.965in I.D. and robust thermal performance. It delivers excellent value where power handling and a durable aluminum former matter, but installers should confirm fit since it is not an OEM direct-replacement.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eIs this an OEM replacement?\u003c\/strong\u003e\u003cbr\u003eThis is a custom-made coil, not an OEM part, so buyers should verify dimensions and fit against their driver.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat size is the inner diameter?\u003c\/strong\u003e\u003cbr\u003eThe coil has a 3.965in inner diameter designed to fit drivers requiring that specific I.D.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow much power can it handle?\u003c\/strong\u003e\u003cbr\u003eThe coil is rated for 1800W+ RMS and uses flat aluminum windings and a black anodized aluminum former for improved heat handling.\u003c\/p\u003e","brand":"Springfield Speaker","offers":[{"title":"Default Title","offer_id":48266046636251,"sku":"B00CUMYK3Y","price":52.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/61OADP1RquL._AC_SL1280.jpg?v=1778307110","url":"https:\/\/gearmusthave.com\/products\/4in-subwoofer-voice-coil-d2-ohm-black-aluminum-former","provider":"GearMustHave","version":"1.0","type":"link"}