{"product_id":"ibasso-d17-atheris-r2r-with-1bit-dual-discrete-dac-tube-amp","title":"iBasso D17 Atheris R2R with 1bit Dual Discrete DAC \u0026 Tube AMP","description":"\u003cp\u003eThe iBasso D17 Atheris is a portable DAC and headphone amplifier with two of iBasso’s own discrete DACs, a four-channel R2R ladder and a 1-bit PWM design, and a fully balanced amplifier with two Korg Nutube tubes. It delivers up to 1,200mW per channel into 32Ω balanced, with a 24-position stepped attenuator for volume and separate batteries for the DAC and amplifier, setting a new benchmark for portable DAC\/amps.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0960\/3199\/8339\/files\/IBASSOD17_970x378_95f37a6c-9f27-4bab-939d-6cae2712e3dd.jpg\" alt=\"iBasso D17 Atheris portable DAC and tube amplifier\" loading=\"lazy\"\u003e\u003c\/p\u003e\n\u003ch3\u003eThree DAC modes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNOS:\u003c\/strong\u003e PCM goes to the R2R DAC and DSD to the 1-bit DAC.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAll to R2R:\u003c\/strong\u003e oversampling mode, everything as PCM.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAll to 1-bit:\u003c\/strong\u003e sigma-delta mode, everything as DSD.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0960\/3199\/8339\/files\/IBASSOD17_790x765_cdcdc87d-df2b-4c83-aefd-b32360155fe8.png\" alt=\"The three DAC modes of the iBasso D17\" loading=\"lazy\"\u003e\u003c\/p\u003e\n\u003ch3\u003eA four-channel balanced R2R DAC\u003c\/h3\u003e\n\u003cp\u003eThe fully balanced, symmetrical R2R DAC uses 284 carefully selected film resistors with a tolerance of 0.01%, plus iBasso’s own hardware resistor compensation and software compensation algorithms. It reaches −104dB THD+N in R2R mode, more than 10dB better than mainstream R2R devices and on a par with flagship desktop R2R DACs, with a warm, delicate, natural analogue sound.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0960\/3199\/8339\/files\/IBASSOD17_790x476_80e893db-33e8-4d24-b577-f00d50fa8427.png\" alt=\"R2R DAC board of the iBasso D17\" loading=\"lazy\"\u003e\u003c\/p\u003e\n\u003ch3\u003e64 PWM DACs in 1-bit mode\u003c\/h3\u003e\n\u003cp\u003eIn 1-bit mode, each of the four channel legs (L+, L−, R+, R−) has 16 PWM-DAC units, 64 in all. FPGA-Master 3.0 manages the I\/O delay to the nanosecond and compensates for wiring delay, so the signal edges reach the DAC aligned and strictly synchronised: −114dB THD+N, with more detail and density.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0960\/3199\/8339\/files\/IBASSOD17_790x733_6c5c7db0-58a0-4d55-971c-1e72accd7c7e.png\" alt=\"1-bit PWM DAC board of the iBasso D17\" loading=\"lazy\"\u003e\u003c\/p\u003e\n\u003ch3\u003eFPGA-Master 3.0\u003c\/h3\u003e\n\u003cp\u003eiBasso’s FPGA-Master 3.0 works with two Accusilicon ultra-low-phase-noise femtosecond oscillators as a single, pure clock source. It buffers the data, calibrates delay, shapes noise, corrects THD, regenerates the global clock and removes jitter for both the R2R and 1-bit DACs, for very low jitter and distortion.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0960\/3199\/8339\/files\/IBASSOD17_790x485_c7b7dff1-5dc7-4528-bada-20b17b23bc11.png\" alt=\"FPGA-Master Gen 3.0 block diagram\" loading=\"lazy\"\u003e\u003c\/p\u003e\n\u003ch3\u003eDual Nutube amplifier\u003c\/h3\u003e\n\u003cp\u003eTwo Korg 6P1 Nutubes give a warm, mellow yet dynamic tube character. Their anodes run from a 24V high-voltage supply for better linearity, and TI BUF634A buffers provide steady, strong current, for over 1,200mW + 1,200mW into 32Ω, enough for flagship IEMs and high-impedance headphones. iBasso also uses its own custom film capacitors and vintage Sprague capacitors.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0960\/3199\/8339\/files\/IBASSOD17_790x642_0e32612e-4889-4b73-8056-08168370ec77.png\" alt=\"Korg Nutube 6P1 tubes in the iBasso D17\" loading=\"lazy\"\u003e\u003c\/p\u003e\n\u003cp\u003eA three-layer composite isolation system reduces microphonics: two circuit boards joined by pin connectors, with damping material, spread and absorb lateral stress, and the tubes sit on the second board on damping material. iBasso measured the microphonic effect below the threshold of hearing, among the best of all its tube products.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0960\/3199\/8339\/files\/IBASSOD17_790x414_0efe5d83-424c-4fbb-b022-396f9c7ef462.png\" alt=\"Layered isolation of the Nutubes in the iBasso D17\" loading=\"lazy\"\u003e\u003c\/p\u003e\n\u003ch3\u003eTwo batteries, two volume controls\u003c\/h3\u003e\n\u003cp\u003eThe DAC and the headphone amplifier run from separate batteries, so the amplifier gets a stable current and digital interference stays out, even at high gain or under heavy load. Analogue volume comes from iBasso’s 24-position, four-section stepped attenuator, a tenth of the size of a traditional one, with the channels matched within ±0.1dB; a professional DSP adds digital volume for finer steps.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0960\/3199\/8339\/files\/IBASSOD17_790x772_787ff937-ae5a-422a-b636-95bb60602779.png\" alt=\"Dual battery design of the iBasso D17\" loading=\"lazy\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0960\/3199\/8339\/files\/IBASSOD17_790x486_5334de78-9bfa-4aee-aa5a-6d54f8db52b5.png\" alt=\"24-position stepped attenuator of the iBasso D17\" loading=\"lazy\"\u003e\u003c\/p\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eR2R, 4.4mm phone out\u003c\/th\u003e\n\u003ctd\u003e7Vrms · 1,200mW + 1,200mW @ 32Ω · THD+N −76dB (tube) · SNR and dynamic range 116dB · crosstalk 129dB · 15Hz–22kHz (−1dB) · output impedance 1.9Ω\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eR2R, 3.5mm phone out\u003c\/th\u003e\n\u003ctd\u003e3.5Vrms · 320mW + 320mW @ 32Ω · THD+N −70dB · SNR 112dB · crosstalk 125dB · output impedance 1Ω\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eR2R, line outs\u003c\/th\u003e\n\u003ctd\u003e4.4mm: 2.4\/4Vrms · THD+N −104dB · SNR 126dB · 3.5mm: 2\/2.4Vrms · THD+N −103dB · SNR 120dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e1-bit, phone outs\u003c\/th\u003e\n\u003ctd\u003e4.4mm: 3.5Vrms · 340mW + 340mW @ 32Ω · SNR 109dB · 3.5mm: 1.7Vrms · 87mW + 87mW @ 32Ω · SNR 104dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e1-bit, line outs\u003c\/th\u003e\n\u003ctd\u003e4.4mm: 2\/2.4Vrms · THD+N −114dB · SNR 118dB · 3.5mm: 1\/1.2Vrms · THD+N −110dB · SNR 114dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eInputs\u003c\/th\u003e\n\u003ctd\u003eUSB-C (PCM 768kHz, DSD512) · 3.5mm coaxial (PCM 768kHz, DoP256) · 3.5mm optical (PCM 192kHz, DoP128)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOutputs\u003c\/th\u003e\n\u003ctd\u003e4.4mm balanced and 3.5mm phone outs · 4.4mm balanced and 3.5mm line outs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBattery\u003c\/th\u003e\n\u003ctd\u003eAbout 15 hours · charging about 3 hours, USB-C 5V\/3A with QC3.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSize and weight\u003c\/th\u003e\n\u003ctd\u003e145 × 86.3 × 31.6mm · 470g\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\u003eiBasso quotes about −76dB THD+N at the headphone outputs, where the Nutube amplifier adds its tube character, and −103dB to −114dB at the line outputs.\u003c\/li\u003e\n\u003cli\u003eIn the box: leather case, pouch, power cable, audio cables and user manual.\u003c\/li\u003e\n\u003cli\u003eFor iBasso’s stepped-attenuator dongle, see the \u003ca href=\"\/products\/ibasso-dc-elite-flagship-portable-dac-a-dx320-in-your-pocket\"\u003eDC Elite\u003c\/a\u003e.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"iBasso","offers":[{"title":"Default Title","offer_id":57117520888195,"sku":"IBASSOD17","price":1699.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0960\/3199\/8339\/files\/img_proxy_643255af-6d65-4f15-978b-4dfccf32a5ed.jpg?v=1767219995","url":"https:\/\/www.advancedmp3players.co.uk\/products\/ibasso-d17-atheris-r2r-with-1bit-dual-discrete-dac-tube-amp","provider":"amp3","version":"1.0","type":"link"}