{"product_id":"fiio-fd15-dynamic-driver-in-ear-monitors-iems-copy","title":"FiiO FD15 Dynamic Driver In-Ear Monitors (IEMs)","description":"\u003ch1\u003e\u003cstrong\u003eStainless steel IEMs with Tesla Valve bass tuning\u003c\/strong\u003e\u003c\/h1\u003e\n\u003cp\u003eThe FiiO FD15 is a single dynamic driver IEM built around a 0.54-inch (13.8mm) magnalium diaphragm with a diamond-like carbon surround. Successor to the FD5, it combines a larger vibrating area with FiiO’s patented Tesla Valve acoustic design for extended bass and a full vocal presentation. Stainless steel shells, two interchangeable tuning nozzles, and a detachable Furukawa cable with swappable plugs give you flexibility in sound, fit, and connection.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eTwo materials with distinct acoustic roles\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThe FD15 pairs a magnalium diaphragm—a blend of magnesium and aluminum—with a diamond-like carbon (DLC) surround. The rigid magnalium diaphragm helps limit distortion for clear treble, while the DLC surround combines stiffness and flexibility to control movement and reduce breakup.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eMore diaphragm area to move air\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThe 0.54-inch (13.8mm) dynamic driver provides approximately 40% more effective diaphragm area than the FD5. Its W-shaped surround also increases effective vibrating area by 30% compared with conventional diaphragms of the same size. These changes allow greater air movement, supporting a fuller presentation with more body through the midrange.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eA larger voice coil and stronger magnetic field\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eFiiO increased the voice coil diameter from the FD5’s 0.24 inches (6.2mm) to 0.34 inches (8.6mm). The longer copper winding improves efficiency and power handling. An external magnet design increases magnet volume by approximately 69.5% and achieves magnetic flux density up to 1.5T, helping maintain control over the diaphragm during demanding musical passages.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eControlled airflow for deeper bass\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eFiiO’s patented F.T.B.S. Tesla Valve design uses precisely shaped channels inside the shell to manage airflow. Air moving outward encounters resistance that lowers the cavity’s resonance frequency, extending bass response. Inward airflow passes more freely to help balance internal pressure and support consistent driver movement.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eAn acoustic prism for consistent timing\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eA frontal acoustic prism sits ahead of the driver to manage the different paths sound waves take toward your ear. By addressing small timing differences, it improves phase consistency and high-frequency diffusion, supporting clear treble alongside the FD15’s vocal-focused tuning.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eTwo nozzles to adjust the balance\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eTwo pairs of interchangeable sound nozzles let you tailor the FD15 to your listening preferences. The red nozzles emphasize bass and give vocals a lusher presentation. The black nozzles emphasize high frequencies, bringing treble detail forward.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eA fit refined around the ear\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eFiiO raised the sound nozzle angle by 6.7° while maintaining its length to improve alignment with the ear canal. Curved MMCX connector housings help reduce pressure against the back of the ear, while a narrower frontal contact surface reduces friction and movement. Fourteen pairs of included ear tips provide several options for finding a comfortable seal.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003ePolished stainless steel shells\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThe closed-back shells use 316L stainless steel formed through powder metallurgy sintering. Hand-polishing and a PVD finish create a reflective surface that follows the curves of the housing. Choose Obsidian Black or Racing Silver.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eA detachable cable with two plug options\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThe included cable combines Furukawa monocrystalline copper with Furukawa monocrystalline silver-plated copper. Four braided strands contain 480 wires in total. Expanded MMCX connectors provide a reinforced connection at each earpiece, while twist-lock interchangeable plugs let you connect to 0.14-inch (3.5mm) single-ended or 0.17-inch (4.4mm) balanced headphone outputs.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eProduct highlights\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSingle 0.54-inch (13.8mm) dynamic driver\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eMagnalium diaphragm with DLC surround\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eW-shaped surround for increased effective vibrating area\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eExternal magnet design with magnetic flux density up to 1.5T\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003ePatented F.T.B.S. Tesla Valve bass enhancement design\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eFrontal acoustic prism for phase consistency\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eTwo pairs of interchangeable tuning nozzles\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e316L stainless steel shells\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eDetachable Furukawa copper and silver-plated copper cable\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eInterchangeable single-ended and balanced plugs\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eFourteen pairs of ear tips included\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eHi-Res Audio certified\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eSpecs\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eEarphone type: Single dynamic driver in-ear monitors\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eAcoustic design: Closed-back\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eWearing style: In-ear with cable routed around the ear\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eDriver diameter: 0.54 inches (13.8mm)\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eDiaphragm: Aluminum-magnesium alloy with DLC surround\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eVoice coil diameter: 0.34 inches (8.6mm)\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eMagnetic flux density: Up to 1.5T\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eFrequency response: 10Hz–40kHz\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eImpedance: 32Ω at 1kHz\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eSensitivity: 112dB\/mW at 1kHz\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eShell material: 316L stainless steel\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eCable: Four strands totaling 480 wires of Furukawa monocrystalline copper and Furukawa monocrystalline silver-plated copper\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eCable length: Approximately 3.9 feet (1.2m)\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eEarphone connectors: Expanded MMCX\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eAudio plugs: Twist-lock interchangeable 0.14-inch (3.5mm) and 0.17-inch (4.4mm) plugs\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eWeight per earpiece: Approximately 0.42 ounces (12g), excluding cable\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eColors: Obsidian Black, Racing Silver\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eWhat’s included\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFiiO FD15 earphones\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eDetachable earphone cable\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eBalanced ear tips: Three pairs, S\/M\/L, with M pre-installed\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eVocal ear tips: Three pairs, S\/M\/L\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eBass ear tips: Three pairs, S\/M\/L\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eFoam ear tips: Two pairs, M\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eHS18 ear tips: Three pairs, S\/M\/L\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eHB11 storage case\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eMMCX quick-release tool\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eCleaning brush\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e0.14-inch (3.5mm) and 0.17-inch (4.4mm) interchangeable plugs\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eRed and black interchangeable sound nozzles: Two pairs total\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eQuick start guide\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"FiiO","offers":[{"title":"Default Title","offer_id":67965997056236,"sku":"APS-1781-1","price":164.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0225\/2721\/3642\/files\/3_b1b7cdd9-25ad-4b08-97f9-71cabf97a807.jpg?v=1793119049","url":"https:\/\/apos.audio\/products\/fiio-fd15-dynamic-driver-in-ear-monitors-iems-copy","provider":"Apos","version":"1.0","type":"link"}