{"product_id":"cayin-ru9-usb-dac-headphone-amplifier","title":"Cayin RU9 USB DAC Headphone Amplifier","description":"\u003cp\u003eThe Cayin RU9 is a portable DAC and headphone amplifier built around a Korg Nutube 6P1 valve. Choose Classic tube, Modern tube or solid-state sound, play from USB, Bluetooth or S\/PDIF, and run it as a dongle, from its own battery or on external power, when its Hyper mode gives up to 1W per channel from the 4.4mm balanced output. Two AKM AK4493SEQ DACs, an XMOS XU316 USB processor, a magnetic back and a magnetic leather case make it a flexible upgrade for a phone, music player or computer.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0960\/3199\/8339\/files\/CAYINRU9_1000x500_89f1d9c7-f293-4cdd-8a23-86095bc90e11.jpg?v=1767216848\" alt=\"Cayin RU9 Nutube DAC and headphone amplifier\" loading=\"lazy\"\u003e\u003c\/p\u003e\n\u003ch3\u003eA Nutube with three timbres\u003c\/h3\u003e\n\u003cp\u003eThe Korg Nutube 6P1 is a modern miniature triode, and the RU9 can use it in two ways or bypass it. Classic tube gives the richest harmonic character (up to 3% distortion, by Cayin’s figures), Modern tube a cleaner tube sound (up to 0.6%), and solid-state, through OPA1662 op-amps and Nexperia transistors, the most neutral (0.008%). All three are available on both outputs, at the same power, and Cayin developed a vibration-reduction system for the tube.\u003c\/p\u003e\n\u003ch3\u003eDual DACs and four-channel balanced amplification\u003c\/h3\u003e\n\u003cp\u003eTwo AK4493SEQ DACs, fed by a third-generation 16-core XMOS XU316 USB processor, play PCM up to 768kHz\/32-bit and native DSD512. A four-channel JRC NJW1195A controls the volume, and a four-channel, fully balanced amplifier drives the 3.5mm and 4.4mm outputs, both usable as headphone or line outputs, with three gain settings (0, −6 and −12dB).\u003c\/p\u003e\n\u003ch3\u003eThree ways to power it\u003c\/h3\u003e\n\u003cp\u003ePlugged in by USB alone, the RU9 works as a dongle. With its 2,000mAh battery it supplements the source and plays for up to 4.7 hours (3.5mm, solid-state), and it recharges in about 1.3 hours with a QC3.0 or PD2.0 charger. Set the mode selector to DC and connect a power adapter, and Hyper mode raises the 4.4mm output from 620mW to 1,000mW per channel into 32Ω (1,170mW into 16Ω), and the 3.5mm output from 310mW to 420mW.\u003c\/p\u003e\n\u003ch3\u003eEvery way in\u003c\/h3\u003e\n\u003cp\u003eBesides USB audio, in UAC 2.0 or 1.0 mode, the RU9 receives Bluetooth 5.1 through a Qualcomm QCC5125 with LDAC, aptX HD, aptX LL, aptX, AAC and SBC, and has a 3.5mm S\/PDIF port that works as a coaxial input or output up to 192kHz\/24-bit. Mac, Android and iOS need no driver; Windows 10 or later may need Cayin’s USB audio driver.\u003c\/p\u003e\n\u003ch3\u003eBuilt to carry\u003c\/h3\u003e\n\u003cp\u003eThe CNC-machined metal housing weighs about 150g, a 0.96-inch OLED screen shows the settings, and a magnetic back panel lets you attach the RU9 to a phone, tablet or player with the supplied magnetic ring; the magnetic PU leather case is included too.\u003c\/p\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eDAC and tube\u003c\/th\u003e\n\u003ctd\u003e2 × AKM AK4493SEQ · Korg Nutube 6P1 · XMOS XU316 · JRC NJW1195A volume\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e4.4mm balanced\u003c\/th\u003e\n\u003ctd\u003e620mW (battery) \/ 1,000mW (DC) @ 32Ω · 1,170mW @ 16Ω (DC) · 1.0Ω · SNR 118dB (solid-state) · separation 105dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e3.5mm\u003c\/th\u003e\n\u003ctd\u003e310mW (battery) \/ 420mW (DC) @ 32Ω · 610mW @ 16Ω (DC) · 0.5Ω · SNR 118dB (solid-state)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTimbres\u003c\/th\u003e\n\u003ctd\u003eSolid-state: THD+N 0.008%, 20Hz–32kHz · Modern tube: 0.6%, 20Hz–32kHz · Classic tube: 3.0%, 20Hz–22kHz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eUSB\u003c\/th\u003e\n\u003ctd\u003eUAC 2.0\/1.0 · PCM 44.1–768kHz\/32-bit · native DSD64–512 · DoP64–256\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBluetooth and S\/PDIF\u003c\/th\u003e\n\u003ctd\u003eBluetooth 5.1 in (QCC5125: LDAC, aptX HD, aptX LL, aptX, AAC, SBC) · S\/PDIF in\/out up to 192kHz\/24-bit on a 3.5mm port\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBattery\u003c\/th\u003e\n\u003ctd\u003e2,000mAh · 3.1–4.7 hours by output and timbre · QC3.0\/PD2.0 charging about 1.3 hours\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSize and weight\u003c\/th\u003e\n\u003ctd\u003e100 × 70 × 15mm · about 150g · 0.96-inch OLED\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\u003eFor Hyper mode, set the mode selector to DC and connect a power adapter (not included).\u003c\/li\u003e\n\u003cli\u003eWindows computers may need Cayin’s USB audio driver.\u003c\/li\u003e\n\u003cli\u003eIn the box: RU9, magnetic PU leather case, magnetic ring, L-shaped USB-C OTG cable and USB-C to USB-A adapter.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Cayin","offers":[{"title":"Default Title","offer_id":57117501620611,"sku":"CAYINRU9","price":449.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0960\/3199\/8339\/files\/img_proxy_ba75ce7b-6f7e-4771-b587-588db7730192.jpg?v=1767216883","url":"https:\/\/www.advancedmp3players.co.uk\/products\/cayin-ru9-usb-dac-headphone-amplifier","provider":"amp3","version":"1.0","type":"link"}