{"product_id":"binary-ep321-mems-6-driver-tribrid-iem-2dd-3ba-mems-direct-drive-hi-res-audiophile-in-ear-monitor-earphone-hifi-music-earbuds","title":"Binary EP321-MEMS 6-Driver Tribrid IEM 2DD+3BA+MEMS Direct Drive Hi-Res Audiophile In-Ear Monitor Earphone HiFi Music Earbuds","description":"\u003ch1\u003eSPECIFICATIONS\u003c\/h1\u003e\n\n\u003cp\u003e \u003c\/p\u003e\n\n\u003cp\u003e\u003cspan\u003eActive Noise-Cancellation\u003c\/span\u003e: \u003cspan style=\"color:#333333\"\u003eNo\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e \u003c\/p\u003e\n\n\u003cp\u003e\u003cspan\u003eCategory\u003c\/span\u003e: \u003cspan style=\"color:#333333\"\u003eEarphones \u0026amp; Headphones\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan\u003eCharging Method\u003c\/span\u003e: \u003cspan style=\"color:#333333\"\u003ecable\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan\u003eCommunication\u003c\/span\u003e: \u003cspan style=\"color:#333333\"\u003eWired\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan\u003eControl Button\u003c\/span\u003e: \u003cspan style=\"color:#333333\"\u003eNo\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan\u003eFeature\u003c\/span\u003e: \u003cspan style=\"color:#333333\"\u003eHiFi In-ear Earphone\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan\u003eFeatures\u003c\/span\u003e: \u003cspan style=\"color:#333333\"\u003eDetachable Cable\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan\u003eFrequency Response Range\u003c\/span\u003e: \u003cspan style=\"color:#333333\"\u003e8 - 40000\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan\u003eFunction\u003c\/span\u003e: \u003cspan style=\"color:#333333\"\u003eHiFi Headphone,Monitor Headphone\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan\u003eHeadphone Pads Material\u003c\/span\u003e: \u003cspan style=\"color:#333333\"\u003eSilicone\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan\u003eHigh-concerned chemical\u003c\/span\u003e: \u003cspan style=\"color:#333333\"\u003eNone\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan\u003eImpedance Range\u003c\/span\u003e: \u003cspan style=\"color:#333333\"\u003eup to 32 Ω\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan\u003eIs wireless\u003c\/span\u003e: \u003cspan style=\"color:#333333\"\u003eNo\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan\u003eLine Length\u003c\/span\u003e: \u003cspan style=\"color:#333333\"\u003e1.2\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan\u003eMaterial\u003c\/span\u003e: \u003cspan style=\"color:#333333\"\u003ePC\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan\u003ePackage List\u003c\/span\u003e: \u003cspan style=\"color:#333333\"\u003eUser Manual,Carrying Bag,Replaceable Pads Set,Detachable Audio Cable\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan\u003ePlug Type\u003c\/span\u003e: \u003cspan style=\"color:#333333\"\u003eLine Type\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan\u003eResistance\u003c\/span\u003e: \u003cspan style=\"color:#333333\"\u003e13\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan\u003eSensitivity\u003c\/span\u003e: \u003cspan style=\"color:#333333\"\u003e122\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan\u003eStyle\u003c\/span\u003e: \u003cspan style=\"color:#333333\"\u003eWired in-ear headphones\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan\u003eTotal Harmonic Distortion\u003c\/span\u003e: \u003cspan style=\"color:#333333\"\u003e1\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan\u003eVocalism Principle\u003c\/span\u003e: \u003cspan style=\"color:#333333\"\u003eHybrid Technology\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan\u003eVoice assistant built-in\u003c\/span\u003e: \u003cspan style=\"color:#333333\"\u003eno\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan\u003eVolume Control\u003c\/span\u003e: \u003cspan style=\"color:#333333\"\u003eNo\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan\u003eWaterproof\u003c\/span\u003e: \u003cspan style=\"color:#333333\"\u003eNo\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan\u003eWireless Type\u003c\/span\u003e: \u003cspan style=\"color:#333333\"\u003eNone\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan\u003eWith Microphone\u003c\/span\u003e: \u003cspan style=\"color:#333333\"\u003eNo\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e \u003c\/p\u003e\n\u003cdiv\u003e\n\u003cp style=\"font-family:Cabin, sans-serif;font-size:1.5rem;font-weight:700;letter-spacing:normal;text-align:start;white-space:normal;color:rgb(34, 34, 34);background-color:rgb(255, 255, 255);margin:2rem 0px 1rem;margin-bottom:1rem;margin-top:2rem;margin-left:0px;margin-right:0px;box-sizing:border-box\" align=\"start\"\u003e\u003cspan\u003e💡\u003c\/span\u003eAbout EP321 MEMS Driver\u003cspan\u003e👇\u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp style=\"font-family:Cabin, sans-serif;font-size:16px;font-weight:400;letter-spacing:normal;text-align:start;white-space:normal;color:rgb(77, 77, 77);background-color:rgb(255, 255, 255);margin-bottom:1rem;margin-top:1rem;box-sizing:border-box\" class=\"ds-markdown-paragraph\" align=\"start\"\u003e\u003cspan\u003eThe EP321 is equipped with an ultra-compact MEMS tweeter unit, with a package size of only 15.4mm³, which may be the smallest MEMS speaker unit in the \u003c\/span\u003eaudio industry\u003cspan\u003e today. Based on PZT thin-film piezoelectric technology, the diaphragm and driving structure are integrated and fabricated entirely using MEMS processes. In terms of acoustic performance, it offers excellent high-frequency extension and can easily extend beyond 40kHz, delivering an exceptional sound quality experience that meets Hi-Res certification standards.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"font-family:Cabin, sans-serif;font-size:16px;font-weight:400;letter-spacing:normal;text-align:start;white-space:normal;color:rgb(77, 77, 77);background-color:rgb(255, 255, 255);margin-bottom:1rem;margin-top:1rem;box-sizing:border-box\" class=\"ds-markdown-paragraph\" align=\"start\"\u003e\u003cspan\u003eTo achieve the required sound pressure level (SPL) technical specifications, existing piezoelectric MEMS speaker solutions on the market currently need an additional dedicated PA chip to maintain a high drive voltage. The new MEMS unit on the EP321 can easily achieve SPL≥100dB @ 6kHz~40kHz with just a 1Vrms drive voltage, meaning it can deliver high-fidelity treble audio directly using existing headphone driving equipment without PA amplification, significantly lowering the application threshold for new MEMS speaker technologies.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"font-family:Cabin, sans-serif;font-size:16px;font-weight:400;letter-spacing:normal;text-align:start;white-space:normal;color:rgb(77, 77, 77);background-color:rgb(255, 255, 255);margin-bottom:1rem;margin-top:1rem;box-sizing:border-box\" class=\"ds-markdown-paragraph\" align=\"start\"\u003e\u003cspan\u003eBenefiting from excellent MEMS structural design and semiconductor process capabilities, it has outstanding response speed and consistency in sound pressure level (±1dB) and phase (±1°). Unlike similar products in the \u003c\/span\u003eaudio industry\u003cspan\u003e that use surface mount and wire bonding packaging schemes, it adopts AAC's specially developed \"quasi-flip-chip\" packaging process, achieving high reliability while ensuring high performance and ultra-compact package size.\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cp style=\"text-align:left\" class=\"heading-2 ace-line old-record-id-UW5Of2YbOd25Q0ctfJUccG92nhc\" align=\"left\"\u003e\u003cstrong\u003e\u003cspan style=\"font-size:22px\"\u003e2DD+3BA+MEMS Tribrid Drivers\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cdiv style=\"text-align:left\" class=\"ace-line ace-line old-record-id-PuNKfjYwkdJTYhc3sUfcb44Gnpg\" align=\"left\"\u003eBinary EP321 features a six-driver tribrid setup each side: 10mm dynamic driver + 6mm passive diaphragm, 3 balanced armature drivers, and 1 direct drive MEMS driver. A professionally designed three-way frequency crossover ensures powerful, clean, and high-resolution sound performance.\u003c\/div\u003e\n\u003c\/div\u003e\u003cp\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/Secfe3491cf8848ffbf71642727d7da8e8.jpg\" slate-data-type=\"image\"\u003e\u003c\/p\u003e\u003cdiv\u003e\n\u003ch2 style=\"text-align:left\" class=\"heading-2 ace-line old-record-id-X3Zwf4LaYdzMoNc9qHNcddRYncg\" align=\"left\"\u003e\u003cstrong\u003e\u003cspan style=\"font-size:22px\"\u003eAdvanced Three-Types of Driver Configuration\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cdiv style=\"text-align:left\" class=\"ace-line ace-line old-record-id-BDqhfdkD0dS4D6cTzBDcJnzRnwe\" align=\"left\"\u003eEquipped with an advanced multi-driver configuration, combining dynamic, balanced armature, and MEMS technologies. The precise three-way crossover optimizes each frequency band, delivering wide dynamic range, rich details, and coherent, engaging sound across all music genres.\u003c\/div\u003e\n\u003c\/div\u003e\u003cp\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/Seaee908c20c04e4993e996d8d838cf3dm.jpg\" slate-data-type=\"image\"\u003e\u003c\/p\u003e\u003cdiv\u003e\n\u003ch2 style=\"text-align:left\" class=\"heading-2 ace-line old-record-id-B8l8fG9pVdguwbc3A5Sc7lSYnIf\" align=\"left\"\u003e\u003cstrong\u003e\u003cspan style=\"font-size:22px\"\u003eDirect Drive MEMS Technology\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cdiv style=\"text-align:left\" class=\"ace-line ace-line old-record-id-UcROfBudcdME8lcfyR9cvN3EnAg\" align=\"left\"\u003eAs the world’s first IEM with Direct Drive MEMS technology, it features a built-in energizer that powers the MEMS driver—no external amplifier needed. The MEMS unit is dedicated to the ultra-high-frequency band, delivering super-fast transients, clean and high-resolution performance with no sharpness.\u003c\/div\u003e\n\u003c\/div\u003e\u003cp\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/S94a332e22dee436381198684e9c25eb8J.jpg\" slate-data-type=\"image\"\u003e\u003c\/p\u003e\u003cdiv\u003e\n\u003ch2 style=\"text-align:left\" class=\"heading-2 ace-line old-record-id-WzamfcY8Ydre6XcEcFXcLRGgnoa\" align=\"left\"\u003e\u003cstrong\u003e\u003cspan style=\"font-size:22px\"\u003eStrong Details, Rich Tone\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cdiv style=\"text-align:left\" class=\"ace-line ace-line old-record-id-ACkKfDE4Od8CQ4c0VahcMmCmnoe\" align=\"left\"\u003eThe composite high-frequency BA + MEMS design enhances detail retrieval and tonal richness. It accurately reproduces instrument timbre, maintains clarity in complex passages, and renders every note, overtone, and texture vividly for an immersive high-resolution listening experience.\u003c\/div\u003e\n\u003c\/div\u003e\u003cp\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/Sf556c31f4bd64a06b0747a4501d49f01q.jpg\" slate-data-type=\"image\"\u003e\u003c\/p\u003e\u003cdiv\u003e\n\u003ch2 style=\"text-align:left\" class=\"heading-2 ace-line old-record-id-N8OkfMCzfdGzGgcHtQkcU692nxd\" align=\"left\"\u003e\u003cstrong\u003e\u003cspan style=\"font-size:22px\"\u003ePrecise Imaging \u0026amp; Accurate Vocals\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cdiv style=\"text-align:left\" class=\"ace-line ace-line old-record-id-OUvjfAf6SdIrqjcQVnZc09x4nzc\" align=\"left\"\u003eOne full-frequency balanced armature driver delivers exquisite midrange details and accurate vocal reproduction. With precise soundstage imaging, vocals sound smooth, expressive, and lifelike—ideal for vocals, jazz, and acoustic music.\u003c\/div\u003e\n\u003c\/div\u003e\u003cp\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/S4a35602af20547b59db06fa25a2c67e3l.jpg\" slate-data-type=\"image\"\u003e\u003c\/p\u003e\u003cdiv\u003e\n\u003ch2 style=\"text-align:left\" class=\"heading-2 ace-line old-record-id-XOEUf3ak8dLNovc5WZ7cvAPunEf\" align=\"left\"\u003e\u003cstrong\u003e\u003cspan style=\"font-size:22px\"\u003eActive+Passive Composite Bass Module\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cdiv style=\"text-align:left\" class=\"ace-line ace-line old-record-id-UxvJfzxRbd3hrncDN09ccqABndc\" align=\"left\"\u003eFeaturing a dual-dynamic bass module: 10mm dynamic driver + 6mm passive diaphragm. This setup produces strong, sensational bass with solid sub-bass rumble and punchy mid-bass, handled with full precision and no muddiness.\u003c\/div\u003e\n\u003c\/div\u003e\u003cp\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/S2b39425546804b1ea5b345f5dbd0dde0e.jpg\" slate-data-type=\"image\"\u003e\u003c\/p\u003e\u003cdiv\u003e\n\u003ch2 style=\"text-align:left\" class=\"heading-2 ace-line old-record-id-JcsYfMuKqdNbhgcMyxocw64Vn5f\" align=\"left\"\u003e\u003cspan style=\"font-size:22px\"\u003e\u003cstrong\u003eSound Frequency Response\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cdiv style=\"text-align:left\" class=\"ace-line ace-line old-record-id-OPDnftmpndwi90cWVczcIsPvn9g\" align=\"left\"\u003eBoasts an ultra-wide frequency response of 8Hz~40kHz, with a smooth, linear curve. It delivers deep sub-bass impact and crisp, extended ultra-high frequencies, ensuring true-to-original audio without harsh peaks or dips.\u003c\/div\u003e\n\u003c\/div\u003e\u003cp\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/S925336c8cf2342dd9f099a80413f5c2a1.jpg\" slate-data-type=\"image\"\u003e\u003c\/p\u003e\u003cdiv\u003e\n\u003ch2 style=\"text-align:left\" class=\"heading-2 ace-line old-record-id-V2iQfprQmdcvIlcueETc879mnxe\" align=\"left\"\u003e\u003cstrong\u003e\u003cspan style=\"font-size:22px\"\u003eExciting Design \u0026amp; Lightweight Shells\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cdiv style=\"text-align:left\" class=\"ace-line ace-line old-record-id-J5G4f2fg7d2TWhcl1x9cMk4Ansv\" align=\"left\"\u003eFeatures CNC-machined stainless steel face panels with irregular geometric elements that reflect different colors at different light angles. Each earbud weighs only 7.5 grams, offering lightweight comfort for all-day listening.\u003c\/div\u003e\n\u003c\/div\u003e\u003cp\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/Sffa865dd5c564217a5da33625ae796e4X.jpg\" slate-data-type=\"image\"\u003e\u003c\/p\u003e\u003cdiv\u003e\n\u003ch2 style=\"text-align:left\" class=\"heading-2 ace-line old-record-id-THw9f05yUdWROrcVhLdce7CZn9d\" align=\"left\"\u003e\u003cstrong\u003e\u003cspan style=\"font-size:22px\"\u003eHigh-Precision 3D Printed Ear Cavity\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cdiv style=\"text-align:left\" class=\"ace-line ace-line old-record-id-XGNTf9cB1dXlaVcnaXMcv852nEr\" align=\"left\"\u003eThe ear housings are crafted using high-precision 3D printing with high-quality resin. The ergonomic shape fits naturally to the ear canal, ensuring a secure, pressure-free fit for long listening sessions and daily use.\u003c\/div\u003e\n\u003c\/div\u003e\u003cp\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/Sbf9175b69c8d4ae1b404e9bbcdf6dd50A.jpg\" slate-data-type=\"image\"\u003e\u003c\/p\u003e\u003cdiv\u003e\n\u003ch2 style=\"text-align:left\" class=\"heading-2 ace-line old-record-id-Eo7QfjZVXd9rnxcRgZwcupuEnVc\" align=\"left\"\u003e\u003cstrong\u003e\u003cspan style=\"font-size:22px\"\u003eUniversal 0.78mm 2-Pin Connector\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cdiv style=\"text-align:left\" class=\"ace-line ace-line old-record-id-TDvWfXeoodOG1zcGIwccosPInHg\" align=\"left\"\u003eEquipped with standard 0.78mm 2-pin connectors for easily swappable detachable cables. The high-quality oxygen-free copper silver-plated cable ensures low-loss audio transmission, with 3.5mm\/4.4mm termination plug options.\u003c\/div\u003e\n\u003cdiv style=\"text-align:left\" class=\"ace-line ace-line old-record-id-Ff5lf7PvMdRA6vcUV0xcKBcGnBg\" align=\"left\"\u003e\n\u003cstrong\u003eRelated Specs:\u003c\/strong\u003e Connector Type: 0.78mm 2-Pin | Termination Plug: 3.5mm\/4.4mm\u003c\/div\u003e\n\u003c\/div\u003e\u003cp\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/S8d6c82d095154dd592b062d87a83cfa6L.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/Sbefff402e45646d282f81521f94807abW.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/S402aea9ab0864b058e8078fbcab31708h.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/A9d2e5daad14e406b9d6f5f70e87be566Z.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/A21ac3157e57f4e55a2fd1b63cce7f5b9r.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/Ae57d8fa773a344d99f1c921ea4a76c47l.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/Aebb9968cb42f4d3a9968fae87ad45453H.jpg\" slate-data-type=\"image\"\u003e\u003c\/p\u003e","brand":"Peter's Electronics","offers":[{"title":"EP321 MEMS-4.4mm","offer_id":52545391558938,"sku":"14:29#EP321 MEMS-4.4mm","price":427.99,"currency_code":"USD","in_stock":true},{"title":"EP321 MEMS-3.5mm","offer_id":52545391591706,"sku":"14:10#EP321 MEMS-3.5mm","price":427.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0997\/8973\/4170\/files\/S5212b4c77e0d4878940301b86e3ff225J.webp?v=1784398542","url":"https:\/\/peterselectronics.com\/products\/binary-ep321-mems-6-driver-tribrid-iem-2dd-3ba-mems-direct-drive-hi-res-audiophile-in-ear-monitor-earphone-hifi-music-earbuds","provider":"Peter's Electronics","version":"1.0","type":"link"}