{"product_id":"fiio-k15-desktop-dac-amp","title":"FiiO K15 Desktop DAC\/Amp","description":"\u003ch1\u003e\u003cstrong\u003eA fully-balanced streaming DAC\/amp \u003c\/strong\u003e\u003c\/h1\u003e\n \u003cp\u003eThe FiiO K15 is a fully-balanced DAC and headphone amplifier that combines streaming, local playback, and DAC\/amp functionality in a single high-performance package. With dual AK4497S DAC chips, a discrete Class-AB headphone amp circuit, PEQ tuning, and a wide range of inputs and outputs—including balanced 4.4mm and XLR4 headphone jacks—the K15 will revive your audio setup. Whether you're playing from Roon, Bluetooth, a CD player, or a USB flash drive, the K15 decodes, amplifies, and delivers it all.\u003cbr\u003e\u003c\/p\u003e\n \u003ch2\u003e\u003cstrong\u003eDual AKM DACs with VELVET SOUND\u003c\/strong\u003e\u003c\/h2\u003e\n \u003cp\u003eAt the core of the K15 are two AK4497S DAC chips, part of AKM’s newest generation of VELVET SOUND processors. These chips are beloved by audiophiles for their dynamic range, low distortion, and warm, lifelike tonality. \u003cbr\u003e\u003c\/p\u003e\n \u003ch2\u003e\n \u003cstrong\u003eDiscrete Class-AB headphone amplification\u003c\/strong\u003e\u003cbr\u003e\n \u003c\/h2\u003e\n \u003cp\u003eThe K15’s headphone amplifier circuit uses a discrete OP + transistor current-boosting design based on the ON Semiconductor MJE243G\/253G. This Class-AB circuit with carefully matched components and a balanced topology delivers up to 3000mW per channel, driving demanding planar magnetics and high-impedance dynamics with ease, while keeping noise low enough for IEMs.\u003cbr\u003e\u003c\/p\u003e\n \u003ch2\u003e\n \u003cstrong\u003eEight playback modes\u003c\/strong\u003e\u003cbr\u003e\n \u003c\/h2\u003e\n \u003cp\u003eFrom USB DAC to Bluetooth receiver, from Roon streamer to local file player, adaptability is the K15’s middle name. Plug in your phone via USB-C, connect wirelessly via LDAC or AirPlay, or load up a flash drive with FLACs. Balanced and unbalanced line inputs let you use it as a headphone amp only, while digital coaxial and optical inputs make it easy to integrate legacy gear like CD players. \u003cbr\u003e\u003c\/p\u003e\n \u003ch2\u003e\n \u003cstrong\u003eFully-balanced signal path from start to finish\u003c\/strong\u003e\u003cbr\u003e\n \u003c\/h2\u003e\n \u003cp\u003eThe K15 uses a fully differential circuit from digital-to-analog conversion through to the final headphone output stage. This architecture improves dynamic range, reduces noise, and cuts down on crosstalk, resulting in clean, spacious playback even at high volumes or with complex mixes.\u003cbr\u003e\u003c\/p\u003e\n \u003ch2\u003e\n \u003cstrong\u003ePhysically-isolated circuit sections\u003c\/strong\u003e\u003cbr\u003e\n \u003c\/h2\u003e\n \u003cp\u003eTo keep things quiet, the K15 separates the digital, analog, and power supply boards inside the chassis. By physically distancing these sections, the K15 reduces the risk of signal interference and keeps the sound clear and accurate.\u003cbr\u003e\u003c\/p\u003e\n \u003ch2\u003e\n \u003cstrong\u003eLow-noise power\u003c\/strong\u003e\u003cbr\u003e\n \u003c\/h2\u003e\n \u003cp\u003eThe built-in 30W power supply is low-noise, industrial-grade, and ready for global voltages from 100V to 240V AC. Want to use your own linear supply? Just plug it into the DC input. Power is also split across multiple rails to isolate digital and analog sections, with up to 14 LDO regulators keeping voltage stable for critical stages like the DAC and amp.\u003cbr\u003e\u003c\/p\u003e\n \u003ch2\u003e\n \u003cstrong\u003eAccusilicon femtosecond clocks\u003c\/strong\u003e\u003cbr\u003e\n \u003c\/h2\u003e\n \u003cp\u003eTo support ultra-precise digital playback, the K15 uses dual Accusilicon AS318-L femtosecond crystal oscillators (45.1584MHz and 49.1520MHz). These clocks minimize phase noise and jitter, ensuring stable decoding for high-res formats up to DSD512 and 768kHz PCM.\u003cbr\u003e\u003c\/p\u003e\n \u003ch2\u003e\n \u003cstrong\u003ePowerful dual-core architecture\u003c\/strong\u003e\u003cbr\u003e\n \u003c\/h2\u003e\n \u003cp\u003eA high-performance dual-core X2000 handles streaming and digital playback duties, while the ESP32-S3 microcontroller manages the system interface, display, and controls. Together, they keep the K15 responsive, reliable, and future-proof with OTA firmware support and app control.\u003cbr\u003e\u003c\/p\u003e\n \u003ch2\u003e\n \u003cstrong\u003e10-band PEQ\u003c\/strong\u003e\u003cbr\u003e\n \u003c\/h2\u003e\n \u003cp\u003eWith support for FiiO’s 10-band PEQ across all digital sources—including streaming, Bluetooth, USB, and optical—you can sculpt the sound to your taste or compensate for headphone quirks. Adjust settings from the web-based interface and store multiple presets for quick recall.\u003cbr\u003e\u003c\/p\u003e\n \u003ch3\u003e\n \u003cstrong\u003eProduct highlights\u003c\/strong\u003e\u003cbr\u003e\n \u003c\/h3\u003e\n \u003cul\u003e\n \u003cli\u003eDual AKM AK4497S DAC chips with VELVET SOUND\u003cbr\u003e\n \u003c\/li\u003e\n \u003cli\u003eDiscrete Class-AB headphone amplifier with MJE243G\/253G transistors\u003cbr\u003e\n \u003c\/li\u003e\n \u003cli\u003e3000mW+3000mW output (balanced)\u003cbr\u003e\n \u003c\/li\u003e\n \u003cli\u003eFully balanced circuit topology\u003cbr\u003e\n \u003c\/li\u003e\n \u003cli\u003eDual Accusilicon femtosecond oscillators\u003cbr\u003e\n \u003c\/li\u003e\n \u003cli\u003eUSB DAC, streaming, Bluetooth, coaxial\/optical, local playback\u003cbr\u003e\n \u003c\/li\u003e\n \u003cli\u003e10-band PEQ across all digital inputs\u003cbr\u003e\n \u003c\/li\u003e\n \u003cli\u003eTouchscreen display with remote and knob control\u003cbr\u003e\n \u003c\/li\u003e\n \u003cli\u003eBuilt-in and external power supply support\u003cbr\u003e\n \u003c\/li\u003e\n \u003cli\u003eWi-Fi (2.4\/5GHz) + Gigabit Ethernet\u003cbr\u003e\n \u003c\/li\u003e\n \u003cli\u003eRoon Ready, MQA full decoding, LDAC\u003cbr\u003e\n \u003c\/li\u003e\n \u003cli\u003ePhysically isolated analog, digital, and power boards\u003cbr\u003e\n \u003c\/li\u003e\n \u003c\/ul\u003e\n \u003ch3\u003e\u003cstrong\u003eSpecs\u003c\/strong\u003e\u003c\/h3\u003e\n \u003cul\u003e\n \u003cli\u003eName\/Model: K15\n \u003c\/li\u003e\n \u003cli\u003eHardware solution: X2000\u003c\/li\u003e\n \u003cli\u003eMCU: ESP32-S3\u003c\/li\u003e\n \u003cli\u003eDAC: AK4497S*2\u003c\/li\u003e\n \u003cli\u003eUSB decoding: XU316\u003c\/li\u003e\n \u003cli\u003eBluetooth decoding: QCC5125\u003c\/li\u003e\n \u003cli\u003eAMP: MJE243G\/253G discrete transistor current amplification\n \u003c\/li\u003e\n \u003cli\u003eWorking mode: USB DAC \/ Coaxial \/ Optical \/ Line in \/ Balanced in \/ Bluetooth \/ Streaming \/ Local\n \u003c\/li\u003e\n \u003cli\u003eColor: Black\/Silver\n \u003c\/li\u003e\n \u003cli\u003eWeight: About 2100g\n \u003c\/li\u003e\n \u003cli\u003eDimensions: About 244.6×213×66.8mm\n \u003c\/li\u003e\n \u003cli\u003eVolume control: Knob \/ Touch \/ Remote\n \u003c\/li\u003e\n \u003cli\u003eMQA: Supports full decoding\n \u003c\/li\u003e\n \u003cli\u003eDriver-free mode: Supported\n \u003c\/li\u003e\n \u003cli\u003eBluetooth receiving (5.1): SBC \/ AAC \/ aptX \/ aptX LL \/ aptX HD \/ aptX Adaptive \/ LDAC\n \u003c\/li\u003e\n \u003cli\u003eGain: Ultra \/ Super high \/ High \/ Medium \/ Low\n \u003c\/li\u003e\n \u003cli\u003eDisplay: 3.93-inch LCD (240×1020) bezel-less\n \u003c\/li\u003e\n \u003cli\u003eTouch-on-display: Supported\n \u003c\/li\u003e\n \u003cli\u003ePEQ: Supports 10-band PEQ (not in line or balanced input)\u003c\/li\u003e\n \u003cli\u003e\n FiiO Link: App supported\n \u003c\/li\u003e\n \u003cli\u003eWiFi: 2.4G\/5G dual-band\n \u003c\/li\u003e\n \u003cli\u003eFirmware upgrade:\n \u003cul\u003e\n \u003cli\u003eSOC via rear USB-A\u003cbr\u003e\n \u003c\/li\u003e\n \u003cli\u003eMCU via RS232\u003cbr\u003e\n \u003c\/li\u003e\n \u003cli\u003eXMOS via front\/rear USB-C\n \u003c\/li\u003e\n \u003c\/ul\u003e\n \u003c\/li\u003e\n \u003cli\u003eRemote control: IR remote (included)\n \u003c\/li\u003e\n \u003cli\u003eKnob indicator light: Custom color\/brightness\/RGB pulse\n \u003c\/li\u003e\n \u003cli\u003eMax. supported sampling rate (PEQ = OFF):\u003cbr\u003e\n \u003cul\u003e\n \u003cli\u003eUSB: 768kHz\/32bit; DSD512\u003cbr\u003e\n \u003c\/li\u003e\n \u003cli\u003eCoaxial: 192kHz\/24bit; DSD64\u003cbr\u003e\n \u003c\/li\u003e\n \u003cli\u003eOptical: 96kHz\/24bit\u003cbr\u003e\n \u003c\/li\u003e\n \u003cli\u003eStreaming: 384kHz\/32bit; DSD256 (DOP)\u003cbr\u003e\n \u003c\/li\u003e\n \u003cli\u003eLocal: 384kHz\/32bit; DSD256\n \u003c\/li\u003e\n \u003c\/ul\u003e\n \u003c\/li\u003e\n \u003cli\u003eAdaptive impedance: PO: 8150Ω, BAL: 8350Ω\u003c\/li\u003e\n \u003cli\u003eUSB ports:\n \u003cul\u003e\n \u003cli\u003e3× USB-C (2× data, 1× RS232 DSP)\u003c\/li\u003e\n \u003cli\u003e1× USB-A (data)\u003c\/li\u003e\n \u003c\/ul\u003e\n \u003c\/li\u003e\n \u003cli\u003eBalanced headphone out:\n \u003cul\u003e\n \u003cli\u003e4.4mm\u003c\/li\u003e\n \u003cli\u003eXLR4\u003c\/li\u003e\n \u003c\/ul\u003e\n \u003c\/li\u003e\n \u003cli\u003eHeadphone out:\n \u003cul\u003e\n \u003cli\u003e3.5mm\u003c\/li\u003e\n \u003c\/ul\u003e\n \u003c\/li\u003e\n \u003cli\u003eDigital optical in: Optical port\n \u003c\/li\u003e\n \u003cli\u003eDigital coaxial in: RCA\n \u003c\/li\u003e\n \u003cli\u003eBalanced line out: XLR3\n \u003c\/li\u003e\n \u003cli\u003eSingle-ended line out: RCA\u003c\/li\u003e\n \u003cli\u003e\n Balanced line in: 4.4mm\n \u003c\/li\u003e\n \u003cli\u003eSingle-ended line in: RCA\n \u003c\/li\u003e\n \u003cli\u003eSlide switch: Power\n \u003c\/li\u003e\n \u003cli\u003eGrounding terminal: M4 banana port\u003c\/li\u003e\n \u003cli\u003e\n Ethernet port: 1000Mbps\u003c\/li\u003e\n \u003cli\u003ePower supply: AC 100–240V~50\/60Hz; DC 12V ≥ 2.5A\u003c\/li\u003e\n \u003cli\u003eUnbalanced headphone out (6.35mm, USB DAC, Ultra high gain):\n \u003cul\u003e\n \u003cli\u003eOutput 1: 1400mW + 1400mW (16Ω)\u003c\/li\u003e\n \u003cli\u003eOutput 2: 1400mW + 1400mW (32Ω)\u003c\/li\u003e\n \u003cli\u003eOutput 3: 180mW + 180mW (300Ω)\u003c\/li\u003e\n \u003cli\u003eTHD+N: \u0026lt; 0.00054%\u003c\/li\u003e\n \u003cli\u003eCrosstalk: ≥76dB\u003c\/li\u003e\n \u003cli\u003eSNR: ≥122dB\u003c\/li\u003e\n \u003cli\u003eOutput impedance: \u0026lt;1Ω\u003c\/li\u003e\n \u003cli\u003eOutput voltage: \u0026gt;20.6Vp-p\u003c\/li\u003e\n \u003cli\u003eNoise: \u0026lt;5.3μV\u003c\/li\u003e\n \u003cli\u003eFR: 20Hz–80kHz (\u0026lt;2.8dB)\u003c\/li\u003e\n \u003c\/ul\u003e\n \u003c\/li\u003e\n \u003cli\u003eBalanced headphone out (4.4mm\/XLR4, USB DAC, Ultra high gain):\n \u003cul\u003e\n \u003cli\u003eOutput 1: 1400mW + 1400mW (16Ω)\u003c\/li\u003e\n \u003cli\u003eOutput 2: 3000mW + 3000mW (32Ω)\u003c\/li\u003e\n \u003cli\u003eOutput 3: 700mW + 700mW (300Ω)\u003c\/li\u003e\n \u003cli\u003eTHD+N: \u0026lt; 0.00059%\u003c\/li\u003e\n \u003cli\u003eCrosstalk: ≥116dB\u003c\/li\u003e\n \u003cli\u003eSNR: ≥120dB\u003c\/li\u003e\n \u003cli\u003eOutput voltage: \u0026gt;41Vp-p\u003c\/li\u003e\n \u003cli\u003eOutput impedance: \u0026lt;1.5Ω\u003c\/li\u003e\n \u003cli\u003eNoise: \u0026lt;9.5μV\u003c\/li\u003e\n \u003cli\u003eFR: 20Hz–80kHz (\u0026lt;2.8dB)\u003c\/li\u003e\n \u003c\/ul\u003e\n \u003c\/li\u003e\n \u003cli\u003ePerformance and parameters of balanced line output (XLR3, USB DAC \/ Coaxial decoding \/ Optical decoding)\n \u003cul\u003e\n \u003cli\u003eTHD+N: \u0026lt; 0.00055% (1kHz \/ –8dB @ 10kΩ)\u003c\/li\u003e\n \u003cli\u003eCrosstalk: ≥117dB (1kHz @ 10kΩ)\u003c\/li\u003e\n \u003cli\u003eFrequency response:\n \u003cul\u003e\n \u003cli\u003e20Hz ~ 20kHz: attenuation \u0026lt; 0.2dB\u003c\/li\u003e\n \u003cli\u003e20Hz ~ 80kHz: attenuation \u0026lt; 2.8dB\u003c\/li\u003e\n \u003c\/ul\u003e\n \u003c\/li\u003e\n \u003cli\u003eSNR: ≥120dB (A-weighted)\u003c\/li\u003e\n \u003cli\u003eOutput power 4: \u0026lt; 3.3μV (A-weighted)\u003c\/li\u003e\n \u003cli\u003eLine output level: 4.8Vrms (1kHz @ 10kΩ)\u003c\/li\u003e\n \u003c\/ul\u003e\n \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\u003eK15 ×1\u003cbr\u003e\n \u003c\/li\u003e\n \u003cli\u003eAC power cord ×1\u003cbr\u003e\n \u003c\/li\u003e\n \u003cli\u003eRemote control ×1\u003cbr\u003e\n \u003c\/li\u003e\n \u003cli\u003eXLR4 decorative plug ×1\u003cbr\u003e\n \u003c\/li\u003e\n \u003cli\u003eFuse ×1\u003cbr\u003e\n \u003c\/li\u003e\n \u003cli\u003eUSB data cables ×2\u003cbr\u003e\n \u003c\/li\u003e\n \u003cli\u003eHeadphone plug adapter ×1\u003cbr\u003e\n \u003c\/li\u003e\n \u003cli\u003eWarranty card ×1\u003cbr\u003e\n \u003c\/li\u003e\n \u003cli\u003eQuick start guide ×1\u003cbr\u003e\n \u003c\/li\u003e\n \u003c\/ul\u003e","brand":"FiiO","offers":[{"title":"Black","offer_id":46866217664687,"sku":"APS-1108-1","price":549.99,"currency_code":"USD","in_stock":true},{"title":"Silver","offer_id":46866217697455,"sku":"APS-1108-2","price":549.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0734\/6415\/2239\/files\/apos-audio-fiio-headphone-dac-amp-fiio-k15-desktop-dac-amp-1183265830.jpg?v=1777716315","url":"https:\/\/freshized.com\/products\/fiio-k15-desktop-dac-amp","provider":"Freshized","version":"1.0","type":"link"}