{"product_id":"cayin-ru9-portable-6p1-electronic-tube-headphone-amplifier-bluetooth5-1-magnetic-rear-panel-audio-decoder-ak4493seq-dac","title":"Cayin RU9 Portable 6P1 Electronic Tube Headphone Amplifier Bluetooth5.1 Magnetic Rear Panel Audio Decoder AK4493SEQ DAC","description":"\u003cp\u003e\u003cb\u003eCayin RU9 Portable 6P1 Electronic Tube Headphone Amplifier Bluetooth5.1 Magnetic Rear Panel Audio Decoder AK4493SEQ DAC\u003cbr\u003e\u003cbr\u003eKey Features:\u003c\/b\u003e\u003cbr\u003e\u003cu\u003eFor Nutube 6P1 Application:\u003c\/u\u003e\u003cbr\u003e- Supports both single-ended 3.5mm and balanced 4.4mm PO\/LO outputs.\u003cbr\u003e- Each output can toggle between tube and solid-state modes.\u003cbr\u003e\u003cbr\u003e\u003cu\u003eClassic:\u003c\/u\u003e\u003cbr\u003e- No global negative feedback; each stage uses local feedback.\u003cbr\u003e- Tube amplification introduces higher total harmonic distortion (THD).\u003cbr\u003e- Rich harmonic texture delivers a warm, nostalgic sonic flavor — classic “tube sound.”\u003cbr\u003e\u003cbr\u003e\u003cu\u003eModern:\u003c\/u\u003e\u003cbr\u003e- Introduces global negative feedback to define total gain.\u003cbr\u003e- THD is significantly reduced.\u003cbr\u003e- Harmonically cleaner, quieter background while preserving the warmth of tubes.\u003cbr\u003e- Yields a sweet, clear, and delicate modern tube audio signature.\u003cbr\u003e\u003cbr\u003e\u003cu\u003eSolid-state:\u003c\/u\u003e\u003cbr\u003e- Based on precision-tuned op-amp ICs and peripheral circuits.\u003cbr\u003e- Offers neutral tonality, fast transients, and highly accurate audio reproduction.\u003cbr\u003e- Ideal for listening to music with its original, uncolored character.\u003cbr\u003e\u003cbr\u003e\u003cu\u003eDual AK4493SEQ DAC:\u003c\/u\u003e\u003cbr\u003e- Equipped with dual AK4493SEQ DACs, each operating in mono mode.\u003cbr\u003e- Left and right channels are decoded separately for lower crosstalk and better channel separation.\u003cbr\u003e\u003cu\u003e\u003cbr\u003e16-Core for XMOS XU316 Processor:\u003c\/u\u003e\u003cbr\u003e- Employs the latest generation XMOS XU316 USB Audio solution for high-performance digital processing.\u003cbr\u003e\u003cbr\u003e\u003cu\u003eTriple Power Supply Modes:\u003c\/u\u003e\u003cbr\u003e- Built-in 2000mAh lithium battery provides up to 4.7 hours of battery-powered use. Also supports USB power from the external device (without charging the battery), as well as external DC power supply for increased output power.\u003cbr\u003e- Compatible with QC\/PD fast charging.\u003cbr\u003e\u003cbr\u003e\u003cu\u003eHyper Mode:\u003c\/u\u003e\u003cbr\u003e- A specialized feature designed for headphone usage under DC power supply. Increases static operating current and voltage for enhanced audio performance.\u003cbr\u003e- Balanced: 1000mW + 1000mW at 32Ω; 1170mW + 1170mW at 16Ω\u003cbr\u003e- Single-ended: 420mW + 420mW at 32Ω; 610mW + 610mW at 16Ω\u003cbr\u003e\u003cbr\u003e\u003cu\u003eMagnetic Back Design:\u003c\/u\u003e\u003cbr\u003e- Magnetic rear panel allows seamless attachment to smartphones.\u003cbr\u003e- Includes a custom Cayin leather case - hand-stitched, supple leather, precise cutouts, and magnetic back for secure attachment.\u003cbr\u003e- Comes with a L-shaped USB cable, ergonomically angled to avoid hand obstruction.\u003cbr\u003e\u003cbr\u003e\u003cu\u003eVibration Isolation:\u003c\/u\u003e\u003cbr\u003e- Custom-designed anti-vibration system for the Nutube vacuum tube.\u003cbr\u003e- Features a custom-built silicon housing on an FPC flexible PCB and a pin-supported vertical suspension system to eliminate microphonics.\u003cbr\u003e\u003cbr\u003e\u003cu\u003eElegant and Compact:\u003c\/u\u003e\u003cbr\u003e- CNC-machined unibody metal chassis.\u003cbr\u003e- Weighs only 150g, and measures 15mm thick.\u003cbr\u003e\u003cbr\u003e\u003cu\u003eThoughtful Details:\u003c\/u\u003e\u003cbr\u003e- 0.96\" color display with adjustable brightness.\u003cbr\u003e- Knurled volume knob with refined tactile resistance.\u003cbr\u003e- Side-mounted multi-color indicator light for charging and sample rate\/format display.\u003cbr\u003e\u003cbr\u003e\u003cu\u003eVersatile Use Scenarios:\u003c\/u\u003e\u003cbr\u003e- USB Audio DAC:\u003cbr\u003e  Supports UAC1.0 (driverless) and UAC2.0 modes.\u003cbr\u003e  Compatible with smartphones, computers, digital audio players, tablets, and gaming consoles.\u003cbr\u003e\u003cbr\u003e- S\/PDIF Input\/Output:\u003cbr\u003e  Uses for Qualcomm QCC5125 for high-definition Bluetooth transmission.\u003cbr\u003e  Supports LDAC and other HD Bluetooth codecs.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eSpecification:\u003c\/b\u003e\u003cbr\u003e- Product size: 100 x 70 x 15mm\u003cbr\u003e- Net weight: 150g\u003cbr\u003e\u003cbr\u003e\u003cb\u003ePackage Included:\u003c\/b\u003e\u003cbr\u003e- 1 x Host\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 990px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/97645\/97645-01.jpg\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 990px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/97645\/97645-02.jpg\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 990px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/97645\/97645-03.jpg\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 990px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/97645\/97645-04.jpg\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 990px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/97645\/97645-05.jpg\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 990px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/97645\/97645-06.jpg\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 990px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/97645\/97645-07.jpg\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 990px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/97645\/97645-08.jpg\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 990px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/97645\/97645-09.jpg\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 990px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/97645\/97645-10.jpg\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 990px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/97645\/97645-11.jpg\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 990px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/97645\/97645-12.jpg\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 990px;\" 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