{"product_id":"fiio-fd15-magnalium-dynamic-driver-iems","title":"FiiO FD15 Magnalium Dynamic Driver IEMs","description":"\u003cp\u003eThe FiiO FD15 is a single dynamic driver in-ear monitor and the successor to the much-loved FD5. Its large 13.8mm driver combines a magnalium (magnesium-aluminium) diaphragm with a W-shaped DLC surround, a long voice coil and a 1.5T external magnet, for a spacious, relaxed and natural sound with new levels of detail. FiiO’s patented “Tesla valve” design deepens the bass, a frontal acoustic prism keeps the FD5’s celebrated vocals, and the 316L stainless steel shells are polished to a mirror finish. Two pairs of sound nozzles and a 480-wire Furukawa copper cable with 3.5mm and 4.4mm plugs are included. It is Hi-Res Audio certified and won VGP awards in 2024 (Gold) and 2025.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0960\/3199\/8339\/files\/fiio-fd15-magnalium-dynamic-driver-iems-photo-silver.jpg?v=1791323312\" alt=\"FiiO FD15 in racing silver\" loading=\"lazy\"\u003e\u003c\/p\u003e\n\u003ch3\u003eIn the engineer’s words: “grand”\u003c\/h3\u003e\n\u003cp\u003eOne of FiiO’s engineers calls the FD15 one of FiiO’s most balanced in-ear monitors for vocals: dense and lush, capturing both mid and low voices and their emotion without losing resolution. The large driver and its structure give deep, cohesive bass, so drums sound solid and powerful. It may not match the very best multi-armature earphones for ultra-high-frequency detail, they say, but in dynamic, complex passages the treble stays clear, and it shows the large soundstage expected of a magnesium-aluminium driver. If they had to choose one word: “grand”, for its solidity, dynamics and soundstage.\u003c\/p\u003e\n\u003ch3\u003eMagnalium diaphragm, DLC surround\u003c\/h3\u003e\n\u003cp\u003eThe FD15 brings a truly high-end driver design to the line. The magnalium diaphragm, a scientifically calculated blend of magnesium and aluminium, is hard and moves with low distortion for clear, detailed treble. The DLC (diamond-like carbon) surround is both rigid and flexible, so there is less break-up and higher-quality sound.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0960\/3199\/8339\/files\/fiio-fd15-magnalium-dynamic-driver-iems-photo-diaphragm.jpg?v=1791323318\" alt=\"The magnalium diaphragm of the FiiO FD15\" loading=\"lazy\"\u003e\u003c\/p\u003e\n\u003cp\u003eFiiO also brings a high-end headphone principle to an earphone: a W-shaped surround, which increases the effective vibrating area by 30% compared with a conventional diaphragm of the same size. With more area and greater movement, the driver delivers a denser, more solid sound.\u003c\/p\u003e\n\u003ch3\u003eA bigger driver, a longer coil, a stronger magnet\u003c\/h3\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003e13.8mm driver\u003c\/th\u003e\n\u003ctd\u003eAbout 40% more effective diaphragm area than the FD5, moving more air for more efficient conversion and vocals that feel close to your ear\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eΦ8.6mm voice coil\u003c\/th\u003e\n\u003ctd\u003eUp from the FD5’s Φ6.2mm: 1.38 times the coil, for 78% more driving power, better efficiency and transients\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e1.5T external magnet\u003c\/th\u003e\n\u003ctd\u003eAbout 69.5% more magnet volume, for abundant, uniform energy\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0960\/3199\/8339\/files\/fiio-fd15-magnalium-dynamic-driver-iems-photo-coil.jpg?v=1791323323\" alt=\"The FiiO FD15 voice coil and driver parts\" loading=\"lazy\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0960\/3199\/8339\/files\/fiio-fd15-magnalium-dynamic-driver-iems-photo-magnet.jpg?v=1791323326\" alt=\"The FiiO FD15 external magnet and its magnetic field simulation\" loading=\"lazy\"\u003e\u003c\/p\u003e\n\u003ch3\u003e“Tesla valve” bass\u003c\/h3\u003e\n\u003cp\u003eFiiO’s patented F.T.B.S. “Tesla valve” design uses channels in the shell, made possible by high-precision powder metallurgy, whose length, angle and number are precisely calculated. As FiiO explains, when air flows out of the cavity the channels make it behave viscously, lowering the cavity’s resonance for deep, impactful bass; when air flows back in, nothing hinders it, so the pressure balances quickly and the driver can work at its best.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0960\/3199\/8339\/files\/fiio-fd15-magnalium-dynamic-driver-iems-photo-tesla.jpg?v=1791323330\" alt=\"The FiiO FD15 Tesla valve bass channels\" loading=\"lazy\"\u003e\u003c\/p\u003e\n\u003ch3\u003eA frontal acoustic prism\u003c\/h3\u003e\n\u003cp\u003eAn acoustic filter in front of the driver keeps the FD5’s acclaimed vocals while adapting to the new driver and spreading the treble. It corrects the tiny delays caused by sound waves taking different paths, for consistent phase and precise control.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0960\/3199\/8339\/files\/fiio-fd15-magnalium-dynamic-driver-iems-photo-exploded.jpg?v=1791323333\" alt=\"Exploded view of the FiiO FD15 with its frontal acoustic prism\" loading=\"lazy\"\u003e\u003c\/p\u003e\n\u003ch3\u003eBuilt for comfort\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNozzle angle:\u003c\/strong\u003e based on user feedback, the nozzle is raised 6.7° along the Y-axis (same length), so it fits the ear canal better and sits more securely.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCurved MMCX connectors:\u003c\/strong\u003e instead of a rigid right angle, a curve that suits more ear sizes and doesn’t press behind the ear.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFront contact surface:\u003c\/strong\u003e narrowed for a better fit, less movement and less friction.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0960\/3199\/8339\/files\/fiio-fd15-magnalium-dynamic-driver-iems-photo-comfort.jpg?v=1791323339\" alt=\"FiiO FD15 comfort testing on a measurement head\" loading=\"lazy\"\u003e\u003c\/p\u003e\n\u003ch3\u003e316L stainless steel, mirror finished\u003c\/h3\u003e\n\u003cp\u003eThe closed-back shells are 316L medical-grade stainless steel, made by powder metallurgy sintering at 1,400°C in ten composite processes for durability, then hand-polished and PVD-plated for a mirror finish, with surfaces that play with light and shadow. Choose obsidian black or racing silver.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0960\/3199\/8339\/files\/fiio-fd15-magnalium-dynamic-driver-iems-photo-shell.jpg?v=1791323346\" alt=\"The 316L stainless steel shells of the FiiO FD15\" loading=\"lazy\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0960\/3199\/8339\/files\/fiio-fd15-magnalium-dynamic-driver-iems-photo-black.jpg?v=1791323351\" alt=\"FiiO FD15 in obsidian black\" loading=\"lazy\"\u003e\u003c\/p\u003e\n\u003ch3\u003eTwo sound nozzles\u003c\/h3\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eRed nozzle\u003c\/th\u003e\n\u003ctd\u003eMore bass, lusher vocals and a more emotional sound\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBlack nozzle\u003c\/th\u003e\n\u003ctd\u003eMore treble, making details easier to hear\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0960\/3199\/8339\/files\/fiio-fd15-magnalium-dynamic-driver-iems-photo-nozzles.jpg?v=1791323355\" alt=\"FiiO FD15 with its red and black sound nozzles and their frequency responses\" loading=\"lazy\"\u003e\u003c\/p\u003e\n\u003ch3\u003eA Furukawa cable, without the mark-up\u003c\/h3\u003e\n\u003cp\u003eCables made from Furukawa’s high-purity monocrystalline copper have been sought after since FiiO used them with the FT3. The FD15’s cable (identical to FiiO’s LC-RC 2024) is coaxially braided from four large strands, each of 100 Furukawa monocrystalline copper wires (0.05mm) and 20 Furukawa silver-plated copper wires (0.08mm): 480 wires in all, 22AWG, after secondary refining at 1,050°C and 744 hours of isothermal sintering. Expanded MMCX connectors give a more stable connection, and twist-lock 3.5mm and 4.4mm plugs (a design licensed from FABRILOUS) let you match your source.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0960\/3199\/8339\/files\/fiio-fd15-magnalium-dynamic-driver-iems-photo-lifestyle.jpg?v=1791323361\" alt=\"FiiO FD15 in-ear monitors next to a laptop\" loading=\"lazy\"\u003e\u003c\/p\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eDriver\u003c\/th\u003e\n\u003ctd\u003e13.8mm dynamic · magnalium diaphragm · W-shaped DLC surround · Φ8.6mm voice coil · 1.5T external magnet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eImpedance and sensitivity\u003c\/th\u003e\n\u003ctd\u003e32Ω · 112dB\/mW (1kHz)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFrequency response\u003c\/th\u003e\n\u003ctd\u003e10Hz–40kHz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCable\u003c\/th\u003e\n\u003ctd\u003eAbout 1.2m · 480 wires, Furukawa copper and silver-plated copper, 22AWG · expanded MMCX · 3.5mm and 4.4mm plugs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eShell and weight\u003c\/th\u003e\n\u003ctd\u003e316L stainless steel, closed-back · about 12g per earpiece\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eColours\u003c\/th\u003e\n\u003ctd\u003eObsidian black or racing silver\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch3\u003eGood to know\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFiiO ships either the new or the older design of interchangeable plug; both are genuine and the cable is the same.\u003c\/li\u003e\n\u003cli\u003eIn the box: FD15, cable with 3.5mm and 4.4mm plugs, red and black sound nozzles, balanced (M fitted), vocal, bass and HS18 ear tips (S, M, L), two pairs of foam tips, HB11 case, MMCX quick-release tool, cleaning brush and quick start guide.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"FiiO","offers":[{"title":"BLACK","offer_id":57117259465091,"sku":"FIIOFD15-BLACK","price":139.99,"currency_code":"GBP","in_stock":true},{"title":"SILVER","offer_id":57117259497859,"sku":"FIIOFD15-SILVER","price":139.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0960\/3199\/8339\/files\/img_proxy_93f2fbf3-7727-4510-852f-7cd1f0d512b8.jpg?v=1767202222","url":"https:\/\/www.advancedmp3players.co.uk\/products\/fiio-fd15-magnalium-dynamic-driver-iems","provider":"amp3","version":"1.0","type":"link"}