{"product_id":"fiio-k9-pro-desktop-dac-and-amplifier","title":"FiiO K9 Pro ESS Desktop Bluetooth DAC\/Amp - Discontinued","description":"\u003ch2\u003e\u003cstrong\u003eK9 PRO ESS\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eFLAGSHIP DESKTOP DAC AND AMPLIFIER\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eHigh performance DAC ES9038PRO*2 | THX-AAA 788+ Tech | Dual femtosecond clocks Qualcomm QCC5124 | Supports LDAC\/aptX adaptive\/aptX HD | Truly balanced design Dual voltage linear transformer | Wide connector selection | App control\u003c\/p\u003e\n\u003ch2\u003eMoves your human “core”, and not just by a little!\u003c\/h2\u003e\n\u003cp\u003eInside the K9 Pro ESS are 2 ES9038PRO DAC chips, specifically designed for maximum performance in desktop-grade equipment. One ES9038PRO chip, with all of its 8 parallel outputs, is used for each channel to achieve richly detailed sound with minimal distortion.  \u003c\/p\u003e\n\u003ch2\u003ePure clean sound, satisfying even demanding listeners\u003c\/h2\u003e\n\u003cp\u003eThe THX AAA 788+ chips used in the K9 Pro ESS provide exemplary details and dynamics no matter if you are using low or high-impedance headphones. The K9 Pro ESS can produce an undistorted 1100mW* under a 300Ω load, and an undistorted 2100mW* under a 32Ω load, 50% higher than the original THX AAA 788 amplifier chips.\u003c\/p\u003e\n\u003cp\u003e*As tested in FiiO Labs under balanced out.\u003c\/p\u003e\n\u003ch2\u003ePrecise Design\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eFully differential, fully balanced design\u003cbr\u003e\u003c\/strong\u003eFully differential signals go through the DAC, volume adjustment, and amp for a truly balanced design. Such a design ensures minimal interference between different components in order to fully maintain all details and large dynamic swings in music for unmatched sound quality.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSix-stage audio circuit, to reveal every last detail\u003c\/strong\u003e \u003cbr\u003eEvery audio signal goes through a mammoth 6-stage circuit to reproduce music as faithfully and as detailed as possible\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSeparated analog and digital sections, partitioned design\u003c\/strong\u003e \u003cbr\u003eThe PCB of the K9 Pro ESS uses a partitioned layout, wherein not only the power supply and signals are separated, but the analog signal loop is also put in an independent section, guaranteeing the integrity of the audio signal being processed. \u003c\/p\u003e\n\u003cp\u003eElectricity is the mother of sound, so special attention was paid to optimizing the K9 Pro ESS’s power supply to ensure excellent sound. The K9 Pro ESS’s linear power supply, with its low-frequency transformer and 4 massive 4700uF capacitors, makes sure that the rest of the system gets abundant clean power.\u003c\/p\u003e\n\u003ch2\u003eElectricity is the mother of sound\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eImmensely robust, Linear power supply\u003cbr\u003e\u003c\/strong\u003eElectricity is the mother of sound, so special attention was paid to optimizing the K9 Pro ESS’s power supply to ensure excellent sound. The K9 Pro ESS’s linear power supply, with its low-frequency transformer and 4 massive 4700uF capacitors, makes sure that the rest of the system gets abundant clean power.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eJust pure sound,\u003c\/strong\u003e \u003cstrong\u003eIsolated digital and analog power delivery\u003c\/strong\u003e \u003cbr\u003eThe digital portions of the K9 Pro ESS physically receive power separately from the analog portions, for effective shielding against audio interference between the two circuits. This ensures pure and faithful reproduction of your music.\u003c\/p\u003e\n\u003cp\u003e* Due to the instability of the supply chain, some materials may be replaced due to shortage. The accompanying drawings are for reference only.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQuality and quantity, LDOs for each circuit stage\u003c\/strong\u003e \u003cbr\u003eBesides the special high-performance linear power supply, the power stabilization and filtering within the audio circuit is also a big contributor to the K9 Pro ESS’s excellent sound. Specifically, in each stage of the audio circuit, ultra-low-noise LDOs are employed for voltage regulation.\u003c\/p\u003e\n\u003ch2\u003eDual femtosecond clocks, Precise clock management\u003c\/h2\u003e\n\u003cp\u003eA dual-mode clock management design is utilized for the K9 Pro ESS. Under USB and Bluetooth decoding, dual asynchronous femtosecond clocks are used, while under optical and coaxial decoding, automatic PLL clocks are employed. A more precise clock management system makes it easier to handle any kind of source and maintain the maximum quality possible. \u003c\/p\u003e\n\u003ch2\u003eMQA Renderer, Lossless sound reproduction \u003c\/h2\u003e\n\u003cp\u003eThe K9 Pro ESS supports the unfolding of MQA tracks, allowing you to listen to high-resolution audio files that are not only reasonably sized, but also retain master-level sound quality that bring you directly into the recording studio. \u003c\/p\u003e\n\u003cp\u003e*With an appropriate music player supporting MQA, the K9 Pro ESS supports up to 8x unfolding \u003c\/p\u003e\n\u003ch2\u003eFast and reliable Hi-Res Bluetooth\u003c\/h2\u003e\n\u003cp\u003eThe K9 Pro ESS employs the Qualcomm QCC5124 to handle Bluetooth duties, with support for formats such as LDAC, aptX HD and aptX Adaptive. This chip ensures that Bluetooth connections are both reliable and quick, satisfying both the low latency needs for games\/videos and the high bitrate necessary for high-resolution audio.\u003c\/p\u003e\n\u003cp\u003e* Bluetooth format support: AAC\/SBC\/aptX\/aptX LL\/aptX HD\/LDAC\/aptx Adaptive\u003c\/p\u003e\n\u003ch2\u003eEssentiality of volume adjustment\u003c\/h2\u003e\n\u003cp\u003eAdjusting the volume may look like a simple concept, but a good execution of it is crucial to an excellent audio experience. The ADC curve reconstruction method of volume adjustment used in the K9 Pro ESS effectively minimizes any left-right channel volume imbalance and noise. It also results in a smooth change of volume across all levels. This attention paid to the simple process of volume adjustment is just another layer to making sure you truly savor your music with the K9 Pro ESS.\u003c\/p\u003e\n\u003ch2\u003eLighting up the mood\u003c\/h2\u003e\n\u003cp\u003eThe RGB indicator lights surrounding the volume knob can light up differently depending on the currently playing sampling rate.\u003c\/p\u003e\n\u003ch2\u003eDial it in with three gain levels\u003c\/h2\u003e\n\u003cp\u003eChoose between high, medium, and low gain with a physical switch to fit exactly your needs when listening to your particular pair of headphones. Thanks to the pure hardware gain circuit, even when listening at low gain with high-sensitivity headphones both dynamic range and musical fidelity remain uncompromised.\u003c\/p\u003e\n\u003ch2\u003ePlentiful connectors to choose from\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eFront:\u003c\/strong\u003e XLR 4-pin, 4.4mm balanced, 6.35mm single-ended headphone outputs \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eRear:\u003c\/strong\u003e 4.4mm balanced line in; coaxial, optical, Bluetooth, RCA, USB input; RCA SE out and XLR*2 balanced out \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSide:\u003c\/strong\u003e USB Type-C port \u003c\/p\u003e\n\u003ch2\u003eRefreshingly modern, custom stand\u003c\/h2\u003e\n\u003cp\u003eThe included custom stand not only reduces the amount of space the K9 Pro ESS takes on your desktop, it also allows for more efficient dissipation of heat through convection – making the stand a true example of both form and function.\u003c\/p\u003e\n\u003ch2\u003eA true Renaissance man\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eDrive power-hungry headphones (desktop USB audio + Headphones)\u003c\/li\u003e\n\u003cli\u003eConnect to home audio setup (desktop USB audio + active speakers)\u003c\/li\u003e\n\u003cli\u003eSide-mounted Type-C port for easy connection to mobile devices\u003c\/li\u003e\n\u003cli\u003eRCA+XLR balanced line out (for active speakers, monitor speakers, external amplifiers)\u003c\/li\u003e\n\u003cli\u003eConnect to mobile devices (players, computers)\u003c\/li\u003e\n\u003cli\u003eApp-controllable desktop amp Built-in Bluetooth Low Energy (BLE) technology allows you to use the FiiO Control App to control functions like filter selection, channel balance, etc. even when not in Bluetooth mode.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003ePacking list:\u003c\/h2\u003e\n\u003cp\u003e1. K9 Pro *1 \u003cbr\u003e2. Power cord*1 \u003cbr\u003e3. Square port USB data cable*1 \u003cbr\u003e4. Bluetooth antenna *1 \u003cbr\u003e5. 6.35mm male to 3.5mm female Headphone jack adapter*1 \u003cbr\u003e6. Quick start*1 \u003cbr\u003e7. Warranty card*1 \u003cbr\u003e8. Instruction card for voltage selection*1 \u003cbr\u003e9. Fuse*1 \u003cbr\u003e10. Voltage protection plug*1\u003c\/p\u003e\n\u003ch2\u003eGeneral specifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eName \/ Model No.\u003c\/td\u003e\n\u003ctd\u003eK9 Pro ESS\u003c\/td\u003e\n\u003ctd\u003eHardware solution\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003eDAC: ES9038PRO*2, USB: XMOS XUF208, Bluetooth: QCC5124, LPF: OPA1612 * 2,\u003c\/p\u003e\n\u003cp\u003evolume IC: NJU72315 * 2, AMP: THX AAA 788+ * 2, linear transformer：THAILIN\/BingZi\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eColor\u003c\/td\u003e\n\u003ctd\u003eBlack\u003c\/td\u003e\n\u003ctd\u003eVolume Scroll\u003c\/td\u003e\n\u003ctd\u003ePotentiometer+ADC Sampling\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e≈2750g\u003c\/td\u003e\n\u003ctd\u003eChannel balance\u003c\/td\u003e\n\u003ctd\u003eL12~R12 (0.5dB per level)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGain\u003c\/td\u003e\n\u003ctd\u003eL\/M\/H\u003c\/td\u003e\n\u003ctd\u003eFiiO Control\u003c\/td\u003e\n\u003ctd\u003eSurpported\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBluetooth format indication\u003c\/td\u003e\n\u003ctd\u003eSurpported\u003c\/td\u003e\n\u003ctd\u003eSampling rate indication\u003c\/td\u003e\n\u003ctd\u003eSurpported\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFirmware upgrade\u003c\/td\u003e\n\u003ctd\u003eSystem firmware and Bluetooth version can be upgraded via USB\u003c\/td\u003e\n\u003ctd\u003eDeep standby\u003c\/td\u003e\n\u003ctd\u003eLong press the multi-function button for about 3s\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLow battery reminder\u003c\/td\u003e\n\u003ctd\u003e\/\u003c\/td\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e≈200x224.5x72mm (excluding feet)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBluetooth transmission\u003c\/td\u003e\n\u003ctd\u003e\/\u003c\/td\u003e\n\u003ctd\u003eBluetooth receiver (5.0)\u003c\/td\u003e\n\u003ctd\u003eAAC\/SBC\/aptX\/aptX LL\/aptX HD\/LDAC\/atpX Adaptive\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBluetooth format indicator\u003c\/td\u003e\n\u003ctd\u003eSBC: blue, AAC: cyan, aptX HD: yellow, aptX: purple, aptX LL: purple, LDAC: white, atpX Adaptive: green\u003c\/td\u003e\n\u003ctd\u003eCharging indicator\u003c\/td\u003e\n\u003ctd\u003e\/\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd rowspan=\"3\" colspan=\"1\"\u003eMaximum supported sampling rate\u003c\/td\u003e\n\u003ctd\u003e384kHz-32bit\/DSD256（USB DAC）\u003c\/td\u003e\n\u003ctd rowspan=\"3\" colspan=\"1\"\u003eRecommended headphone impedance\u003c\/td\u003e\n\u003ctd rowspan=\"3\" colspan=\"1\"\u003e16~600 Ω\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e192kHz-24bit (coaxial)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e96KHz-24bit (optical)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd rowspan=\"1\" colspan=\"4\"\u003eButtons and interfaces\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eButton\u003c\/td\u003e\n\u003ctd\u003ePhysical key + toggle switch\u003c\/td\u003e\n\u003ctd\u003eUSB\u003c\/td\u003e\n\u003ctd\u003eType-C, USB B (data transmission)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSingle-ended line input interface\u003c\/td\u003e\n\u003ctd\u003eRCA socket\u003c\/td\u003e\n\u003ctd\u003eBalanced line input interface\u003c\/td\u003e\n\u003ctd\u003e4.4mm balanced socket\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpdif in\u003c\/td\u003e\n\u003ctd\u003eOptical fiber socket\u003c\/td\u003e\n\u003ctd\u003eDigital coaxial input interface\u003c\/td\u003e\n\u003ctd\u003eRCA socket\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBalanced output interface\u003c\/td\u003e\n\u003ctd\u003e4.4mm socket, XLR4 balanced socket\u003c\/td\u003e\n\u003ctd\u003eHeadphone output interface\u003c\/td\u003e\n\u003ctd\u003eStandard 6.35 mm socket\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBalanced line output interface\u003c\/td\u003e\n\u003ctd\u003eXLR3 balanced socket\u003c\/td\u003e\n\u003ctd\u003eSingle-ended line output interface\u003c\/td\u003e\n\u003ctd\u003eRCA socket\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd rowspan=\"1\" colspan=\"4\"\u003ePower parameters\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower supply\u003c\/td\u003e\n\u003ctd\u003eAC 110-115V~\/AC 220-230V~ （Recommended）\u003c\/td\u003e\n\u003ctd\u003eBattery capacity\u003c\/td\u003e\n\u003ctd\u003e\/\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCharging time\u003c\/td\u003e\n\u003ctd\u003e\/\u003c\/td\u003e\n\u003ctd\u003ePO battery life\u003c\/td\u003e\n\u003ctd\u003e\/\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd rowspan=\"1\" colspan=\"4\"\u003e\u003cstrong\u003eAudio parameters\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd rowspan=\"1\" colspan=\"4\"\u003e\u003cstrong\u003eSingle-ended line output performance parameters\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTHD+N\u003c\/td\u003e\n\u003ctd\u003e＜0.00042%(1kHz\/10kΩ\/dbA)\u003c\/td\u003e\n\u003ctd\u003eSNR\u003c\/td\u003e\n\u003ctd\u003e≥123dB (dbA)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCrosstalk\u003c\/td\u003e\n\u003ctd\u003e≥115dB (1kHz\/10kΩ)\u003c\/td\u003e\n\u003ctd\u003eNoise floor\u003c\/td\u003e\n\u003ctd\u003e＜1.9μV（dbA）\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFrequency response\u003c\/td\u003e\n\u003ctd\u003e20Hz~20kHz (-3dB)\u003c\/td\u003e\n\u003ctd\u003eLine Level\u003c\/td\u003e\n\u003ctd\u003e2.5Vrms (1kHz\/10kΩ)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd rowspan=\"1\" colspan=\"4\"\u003eBalanced line output performance parameters\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTHD+N\u003c\/td\u003e\n\u003ctd\u003e＜0.00025%(1kHz\/10kΩ\/dbA)\u003c\/td\u003e\n\u003ctd\u003eSNR\u003c\/td\u003e\n\u003ctd\u003e≥128dB (dbA)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCrosstalk\u003c\/td\u003e\n\u003ctd\u003e≥125dB (1kHz\/10kΩ)\u003c\/td\u003e\n\u003ctd\u003eNoise floor\u003c\/td\u003e\n\u003ctd\u003e＜1.9μV（dbA）\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFrequency response\u003c\/td\u003e\n\u003ctd\u003e20Hz~50kHz (-1.5dB)\u003c\/td\u003e\n\u003ctd\u003eLine Level\u003c\/td\u003e\n\u003ctd\u003e5Vrms (1kHz\/10kΩ)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd rowspan=\"1\" colspan=\"4\"\u003e\u003cstrong\u003eSingle-ended headphone output performance parameters（6.35mm）\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eContinuous undistorted output power 1\u003c\/td\u003e\n\u003ctd\u003e≥1.1W（16Ω \/ THD+N＜1%， AUX IN)\u003c\/td\u003e\n\u003ctd\u003eOutput impedance\u003c\/td\u003e\n\u003ctd\u003e＜1Ω（32Ω）\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eContinuous undistorted output power 2\u003c\/td\u003e\n\u003ctd\u003e≥1.0W(16Ω\/THD+N＜1%，UAC\/SPDIF\/BT IN)\u003c\/td\u003e\n\u003ctd\u003eCrosstalk\u003c\/td\u003e\n\u003ctd\u003e≥75dB (1 kHz\/32Ω，AUX IN)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eContinuous undistorted output power 3\u003c\/td\u003e\n\u003ctd\u003e≥281mW（300Ω \/ THD+N＜1%，AUX IN)\u003c\/td\u003e\n\u003ctd\u003eTHD+N\u003c\/td\u003e\n\u003ctd\u003e＜0.00033% (1 kHz\/32Ω\/dbA)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNoise floor\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e＜2μV（dbA，AUX  IN)\u003c\/p\u003e\n\u003cp\u003e＜3μV（dbA，UAC\/SPDIF\/BT IN）\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003eSNR\u003c\/td\u003e\n\u003ctd\u003e≥129dB (dbA)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFrequency response\u003c\/td\u003e\n\u003ctd\u003e20 Hz~50kHz (-1.5dB)\u003c\/td\u003e\n\u003ctd\u003eMAX Output Voltage\u003c\/td\u003e\n\u003ctd\u003e＞26Vp-p\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd rowspan=\"1\" colspan=\"4\"\u003e\u003cstrong\u003eBalanced headphone output performance parameters（4.4mm\/XLR4）\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eContinuous undistorted output power 1\u003c\/td\u003e\n\u003ctd\u003e≥1.1W（16Ω \/ THD+N＜1%)\u003c\/td\u003e\n\u003ctd\u003eOutput impedance\u003c\/td\u003e\n\u003ctd\u003e＜1Ω（32Ω）\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eContinuous undistorted output power 2\u003c\/td\u003e\n\u003ctd\u003e≥2.1W（32Ω \/THD+N＜1%)\u003c\/td\u003e\n\u003ctd\u003eCrosstalk\u003c\/td\u003e\n\u003ctd\u003e≥114dB (1 kHz，AUX IN)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eContinuous undistorted output power 3\u003c\/td\u003e\n\u003ctd\u003e≥1.1W（300Ω \/ THD+N＜1%)\u003c\/td\u003e\n\u003ctd\u003eTHD+N\u003c\/td\u003e\n\u003ctd\u003e＜0.0003% (1 kHz\/32Ω\/dbA)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNoise floor\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e＜3μV（dbA， AUX IN）\u003c\/p\u003e\n\u003cp\u003e4.5uV(dbA,UAC\/SPDIF\/BT)\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003eSNR\u003c\/td\u003e\n\u003ctd\u003e≥123dB (dbA)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFrequency response\u003c\/td\u003e\n\u003ctd\u003e20Hz~50kHz (-3dB)\u003c\/td\u003e\n\u003ctd\u003eMAX Output Voltage\u003c\/td\u003e\n\u003ctd\u003e＞52Vp-p\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003eComparison\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e \u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eK9 Pro\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eK9 Pro ESS\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd rowspan=\"5\" colspan=\"1\"\u003e\u003cstrong\u003eappearance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003eDimensions\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e200*224.5*76mm (height including feet)\u003c\/td\u003e\n\u003ctd\u003e200*224.5 * 72mm (height excluding feet)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eweight\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003eAbout 2750g\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003eAbout 2700g\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003eVolume knob\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003eStainless steel PVD silver\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003eAluminum alloy PVD gold\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003eHeat emission hole\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\/\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003eOn both sides\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u0026amp;color\u003c\/td\u003e\n\u003ctd\u003eAll aluminum alloy, black\u003c\/td\u003e\n\u003ctd\u003eAll aluminum alloy, black\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd rowspan=\"6\" colspan=\"1\"\u003e\u003cstrong\u003eInterfaces\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003epower supply\u003c\/td\u003e\n\u003ctd\u003eAC + built-in Linear Power Supply\u003c\/td\u003e\n\u003ctd\u003eAC + built-in Linear Power Supply\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd rowspan=\"1\"\u003eDigital input interface\u003c\/td\u003e\n\u003ctd rowspan=\"1\"\u003eUSB; Optical; Coaxial; Bluetooth\u003c\/td\u003e\n\u003ctd rowspan=\"1\"\u003eUSB; Optical; Coaxial; Bluetooth\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAnalog input interface\u003c\/td\u003e\n\u003ctd\u003eRCA;4.4mm balanced input\u003c\/td\u003e\n\u003ctd\u003eRCA;4.4mm balanced input\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUSB interface\u003c\/td\u003e\n\u003ctd\u003eUSB B ;Type C\u003c\/td\u003e\n\u003ctd\u003eUSB B ;Type C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeadphone output\u003c\/td\u003e\n\u003ctd\u003eBalance: XLR-4;4.4mm; Single-ended:6.35mm\/3.5mm\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003eBalance: XLR-4;4.4mm;\u003c\/p\u003e\n\u003cp\u003eSingle-ended:6.35mm\/3.5mm\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLine out\u003c\/td\u003e\n\u003ctd\u003eRCA\/Balanced XLR * 2\u003c\/td\u003e\n\u003ctd\u003eRCA\/Balanced XLR * 2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd rowspan=\"12\" colspan=\"1\"\u003e\n\u003cp\u003e\u003cstrong\u003eConfiguration\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003ePower supply unique design\u003c\/td\u003e\n\u003ctd\u003eDigital and Analog Isolation Design\u003c\/td\u003e\n\u003ctd\u003eDigital and Analog Isolation Design\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAudio processing layers\u003c\/td\u003e\n\u003ctd\u003e6 layers\u003c\/td\u003e\n\u003ctd\u003e6 layers\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClock design\u003c\/td\u003e\n\u003ctd\u003edual mode dual crystal oscillator\u003c\/td\u003e\n\u003ctd\u003edual mode dual crystal oscillator\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003efilter\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e6 kinds\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e7kinds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUSB CHIP\u003c\/td\u003e\n\u003ctd\u003eXMOS XUF208\u003c\/td\u003e\n\u003ctd\u003eXMOS XUF208\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMQA\u003c\/td\u003e\n\u003ctd\u003eRenderer\u003c\/td\u003e\n\u003ctd\u003eRenderer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBluetooth\u003c\/td\u003e\n\u003ctd\u003eQCC5124\u003c\/td\u003e\n\u003ctd\u003eQCC5124\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAudio clock\u003c\/td\u003e\n\u003ctd\u003eHigh precision PLL + dual crystal oscillator\u003c\/td\u003e\n\u003ctd\u003eHigh precision PLL + dual crystal oscillator\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAudio DAC\u003c\/td\u003e\n\u003ctd\u003eAK4499EQ*1\u003c\/td\u003e\n\u003ctd\u003eES9038Pro*2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput mode\u003c\/td\u003e\n\u003ctd\u003eHP\/LO\/DAC\u003c\/td\u003e\n\u003ctd\u003eHP\/LO\/DAC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGain\u003c\/td\u003e\n\u003ctd\u003eThree gears\u003c\/td\u003e\n\u003ctd\u003eThree gears\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAmp chip\u003c\/td\u003e\n\u003ctd\u003eDual THX AAA 788+\u003c\/td\u003e\n\u003ctd\u003eDual THX AAA 788+\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd rowspan=\"5\" colspan=\"1\"\u003e\u003cstrong\u003eOutput performance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003eOutput power (PO)\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e2000mW(32 Ω), 278mW(300 Ω)\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e2100mW(32 Ω),281mW(300 Ω)\u003c\/p\u003e\n\u003cp\u003eBalance: 2100mW(32 Ω),1100mW(300 Ω)\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003eOutput power (BAL)\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e2000mW(32 Ω),1100mW(300 Ω)\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e2100mW (32Ω)\u003c\/p\u003e\n\u003cp\u003e1100mW (300Ω)\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePeak output voltage\u003c\/td\u003e\n\u003ctd\u003e51Vpp\u003c\/td\u003e\n\u003ctd\u003e52Vpp\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003eTHD+N\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e≤ 0.0003%\u003c\/td\u003e\n\u003ctd\u003e≤ 0.00025%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003eSNR\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e≥ 123dB\u003c\/td\u003e\n\u003ctd\u003e≥ 129dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"FiiO","offers":[{"title":"Default Title","offer_id":40746985619646,"sku":"K9 Pro (US PLUG)","price":849.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0065\/4432\/6771\/products\/5346777_1200x1200_0ffe91f4-2978-406b-9735-1d208b780bec.png?v=1762458560","url":"https:\/\/audio46.mom\/products\/fiio-k9-pro-desktop-dac-and-amplifier","provider":"Audio46 Headphone Store","version":"1.0","type":"link"}