{"product_id":"fiio-m33-r2r-digital-audio-player","title":"M33 R2R Digital Audio Player","description":"\u003cp\u003eThe FiiO M33 R2R brings FiiO’s own R2R resistor-array DAC, originally designed for its desktop equipment, to a portable player for the first time. Tuned by FiiO’s acoustic engineers and refined with feedback from audiophiles around the world, it combines the lush, analogue-like warmth associated with R2R with balanced, high-fidelity performance. Around it are a multi-stage TI amplifier with up to 1,100mW + 1,100mW, the M27’s DAPS digital audio purification system, Android 13 on a Snapdragon 680 with 8GB of RAM and 128GB of storage, a 5.5-inch 1080p screen, a 4,400mAh battery for up to 15.5 hours and a patented Desktop Mode for use at home.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0960\/3199\/8339\/files\/fiio-m33-r2r-digital-audio-player-photo-hero.jpg?v=1791337502\" alt=\"FiiO M33 R2R music players in gold, dark blue and black\" loading=\"lazy\"\u003e\u003c\/p\u003e\n\u003ch3\u003eFully differential 24-bit R2R resistor arrays\u003c\/h3\u003e\n\u003cp\u003eInstead of a delta-sigma DAC chip, the M33 R2R converts with precision resistor arrays: four channels, fully differential, using a total of 192 precision thin-film resistors with 0.1% accuracy and low temperature drift. In local playback you can choose OS mode (upsampling to 352.8kHz or 384kHz, the default) or NOS mode (native sample-rate output), and two selectable sound profiles, Flat (natural) and Warm (warmer), shape the character.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0960\/3199\/8339\/files\/fiio-m33-r2r-digital-audio-player-photo-r2r.jpg?v=1791337506\" alt=\"The R2R resistor array inside the FiiO M33 R2R\" loading=\"lazy\"\u003e\u003c\/p\u003e\n\u003ch3\u003eDAPS: the M27’s digital audio purification system\u003c\/h3\u003e\n\u003cp\u003eThe M33 R2R uses the same ultra-high precision, ultra-low jitter unified clock as FiiO’s flagship M27: a high-capacity FPGA with two custom femtosecond oscillators (45.1584MHz and 49.152MHz), which handles the OS\/NOS processing and feeds the R2R arrays. FiiO says it is a big step up in digital processing efficiency and fidelity over the M23; the new FPGA has 4,480 logic units, 288.89% more than the previous one. The low-jitter coaxial circuit rivals dedicated digital transports, with jitter as low as 71.5ps.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0960\/3199\/8339\/files\/fiio-m33-r2r-digital-audio-player-photo-fpga.jpg?v=1791337511\" alt=\"The FPGA and clocks of the FiiO M33 R2R, and its larger FPGA compared with the previous one\" loading=\"lazy\"\u003e\u003c\/p\u003e\n\u003ch3\u003eA multi-stage audio circuit, powered by TI\u003c\/h3\u003e\n\u003cp\u003eTwo TI Burr-Brown OPA1637 fully differential op-amps handle I\/V conversion and signal conditioning for a natural, expansive soundstage, followed by OPA1662 low-pass filters and an NJW1195A precision volume control with very low noise. The output stage uses four TI INA1620 chips in parallel, which keep the channels free of interference even when driven hard, for up to 1,100mW + 1,100mW into 32Ω from the 4.4mm balanced output and 470mW + 470mW from the 3.5mm output. Eight Rubycon film capacitors give natural, transparent mids and smooth, fatigue-free treble.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0960\/3199\/8339\/files\/fiio-m33-r2r-digital-audio-player-photo-circuit.jpg?v=1791337517\" alt=\"The TI op-amps, NJW1195A volume control and INA1620 output stage of the FiiO M33 R2R\" loading=\"lazy\"\u003e\u003c\/p\u003e\n\u003ch3\u003eFour gain levels, including super high gain\u003c\/h3\u003e\n\u003cp\u003eChoose low, medium, high or super high gain. Super high gain, FiiO’s over-ear headphone mode, appears when a PD2.0 or PD3.0 fast charger is connected to either USB-C port: it switches the amplifier to a higher-voltage supply, raising the balanced output from 900mW to 1,100mW per channel into 32Ω (and 240mW into 300Ω), enough for demanding high-impedance over-ear headphones.\u003c\/p\u003e\n\u003ch3\u003eA precision power supply and shielding\u003c\/h3\u003e\n\u003cp\u003eThe digital and analogue stages have independent supplies, and the analogue stage has three separate circuits for the R2R arrays, the preamp and the amplifier, each with low-noise LDOs, for a more refined, natural sound. A 15W power management system, 65A high-current MOSFETs and large storage capacitors give ample headroom. The digital processing, R2R arrays, amplifier and power sections sit in separate, individually shielded zones, for a blacker background and a clearer soundstage.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0960\/3199\/8339\/files\/fiio-m33-r2r-digital-audio-player-photo-power.jpg?v=1791337522\" alt=\"The power supply system of the FiiO M33 R2R\" loading=\"lazy\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0960\/3199\/8339\/files\/fiio-m33-r2r-digital-audio-player-photo-shield.jpg?v=1791337528\" alt=\"The shielded zones inside the FiiO M33 R2R\" loading=\"lazy\"\u003e\u003c\/p\u003e\n\u003ch3\u003eAndroid 13 on a Snapdragon 680\u003c\/h3\u003e\n\u003cp\u003eA Qualcomm Snapdragon 680 (6nm, up to 2.4GHz) with 8GB of RAM and 128GB of storage (about 112GB available) gives smooth streaming and multitasking, with headroom for future updates; a microSD slot takes cards up to 2TB. Choose Android, Pure Music, AirPlay, USB DAC or Bluetooth receiver mode. A global 10-band PEQ works with FiiO Music and third-party apps, with AUTO EQ to match your headphones’ frequency curve automatically, presets such as pop, jazz and classical, and per-band tuning; global SRC bypass and All to DSD are system-wide too.\u003c\/p\u003e\n\u003ch3\u003eA 5.5-inch HD screen with cassette, spectrum and VU themes\u003c\/h3\u003e\n\u003cp\u003eThe fully laminated 5.5-inch 1080 × 2160 screen, with an oleophobic coating and a pre-fitted tempered screen protector, is made for high-fidelity entertainment, and new cassette-tape, spectrum and VU-meter themes make every track more immersive.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0960\/3199\/8339\/files\/fiio-m33-r2r-digital-audio-player-photo-themes.jpg?v=1791337534\" alt=\"FiiO M33 R2R screens and leather cases\" loading=\"lazy\"\u003e\u003c\/p\u003e\n\u003ch3\u003eA dedicated XMOS chip for USB\u003c\/h3\u003e\n\u003cp\u003eA dedicated XMOS XU316 gives ultra-low latency as a USB DAC (up to 768kHz\/32-bit and native DSD512), so sound stays in sync with video on every device.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0960\/3199\/8339\/files\/fiio-m33-r2r-digital-audio-player-photo-xmos.jpg?v=1791337540\" alt=\"The XMOS XU316 USB chip of the FiiO M33 R2R\" loading=\"lazy\"\u003e\u003c\/p\u003e\n\u003ch3\u003eOutputs for headphones, speakers and DACs\u003c\/h3\u003e\n\u003cp\u003eThe 3.5mm and 4.4mm outputs drive single-ended and balanced headphones (one at a time, in the order you plug them in), and switch to line outputs (2Vrms and 4Vrms) with dedicated line-amp circuitry for speakers and amplifiers; line-out volume can be fixed or adjustable. The 3.5mm socket also gives coaxial S\/PDIF up to 384kHz\/24-bit and DSD128, and USB audio output goes up to 768kHz\/32-bit and DSD512, so the M33 R2R can feed an external DAC, or pair with FiiO’s DK1 PRO dock as a streaming transport. Two-way Bluetooth 5.0 transmits LDAC, LHDC, aptX HD, aptX and SBC, and receives LDAC and SBC.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0960\/3199\/8339\/files\/fiio-m33-r2r-digital-audio-player-photo-ports.jpg?v=1791337546\" alt=\"The headphone outputs and two USB-C ports of the FiiO M33 R2R\" loading=\"lazy\"\u003e\u003c\/p\u003e\n\u003ch3\u003e4,400mAh, fast charging and Desktop Mode\u003c\/h3\u003e\n\u003cp\u003eThe 4,400mAh battery gives up to 15.5 hours from the 3.5mm output or 13.5 hours balanced, longer than the M23, and low-temperature fast charging fills it in about 1.5 hours with a PD3.0 PPS charger. There are two USB-C ports: the USB 3.0 port handles data, charging and USB host\/OTG, while POWER IN is for charging and power only. Switch on FiiO’s patented Desktop Mode (D.MODE, patent ZL202321946664.8) and the M33 R2R runs directly from USB power without charging or draining the battery, reducing charge cycles to extend its life. If the battery falls below 15%, it charges until full.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0960\/3199\/8339\/files\/fiio-m33-r2r-digital-audio-player-photo-battery.jpg?v=1791337552\" alt=\"The 4,400mAh battery of the FiiO M33 R2R\" loading=\"lazy\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0960\/3199\/8339\/files\/fiio-m33-r2r-digital-audio-player-photo-dmode.jpg?v=1791337557\" alt=\"Desktop Mode on the FiiO M33 R2R\" loading=\"lazy\"\u003e\u003c\/p\u003e\n\u003ch3\u003eSlim, light and easy to hold\u003c\/h3\u003e\n\u003cp\u003eLike the M21, the M33 R2R has clean, minimalist lines: an 18:9 shape, dual-bevelled edges and an AG matte glass back, at about 258g and 17mm thick. A customisable multifunction button gives one-press access to features you use often, such as favourites, the EQ, USB DAC or Bluetooth receiver mode, or cassette mode. A leather case comes fitted: khaki with the retro gold version, colour-matched with dark blue and black.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0960\/3199\/8339\/files\/FIIOM33_1000x602_4477e32f-ea48-4429-bfcd-e347cc661869.jpg?v=1773119309\" alt=\"FiiO M33 R2R players in their protective cases on a desk\" loading=\"lazy\"\u003e\u003c\/p\u003e\n\u003cp\u003eIt also pairs perfectly with FiiO’s SNOWSKY \u003ca href=\"\/products\/fiio-snowsky-retrobox-beatbox-active-speaker\"\u003eRETRO BOX\u003c\/a\u003e cassette-style Bluetooth speaker (LDAC, 5W × 2), sold separately.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0960\/3199\/8339\/files\/fiio-m33-r2r-digital-audio-player-photo-retrobox.jpg?v=1791337563\" alt=\"FiiO M33 R2R with the SNOWSKY RETRO BOX speaker\" loading=\"lazy\"\u003e\u003c\/p\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eDAC\u003c\/th\u003e\n\u003ctd\u003eFiiO fully differential 24-bit R2R (4 channels, 192 thin-film resistors, 0.1%) · OS\/NOS · DAPS: FPGA + 2 femtosecond oscillators\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAmplifier\u003c\/th\u003e\n\u003ctd\u003e2 × OPA1637 · OPA1662 · NJW1195A volume · 4 × INA1620 · 8 Rubycon film capacitors\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e4.4mm balanced\u003c\/th\u003e\n\u003ctd\u003e1,100mW @ 32Ω and 240mW @ 300Ω (super high gain) · 900mW @ 32Ω and 165mW @ 300Ω (high) · SNR ≥116dB · noise floor \u0026lt;10.3µV · \u0026lt;1.5Ω\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e3.5mm\u003c\/th\u003e\n\u003ctd\u003e470mW @ 32Ω (super high gain) · 300mW @ 32Ω (high) · 60mW @ 300Ω · SNR ≥117dB · noise floor \u0026lt;5.5µV · \u0026lt;0.8Ω\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePerformance\u003c\/th\u003e\n\u003ctd\u003eTHD+N: PCM 0.0183% (3.5mm), 0.0171% (4.4mm); DSD 0.0033% · crosstalk ≥74dB (3.5mm), ≥104dB (4.4mm) · 20Hz–20kHz (\u0026lt;1.3dB), 20Hz–40kHz (\u0026lt;3dB)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eLine and digital out\u003c\/th\u003e\n\u003ctd\u003e3.5mm 2Vrms · 4.4mm 4Vrms · coaxial 384kHz\/24-bit, DSD128 · USB audio 768kHz\/32-bit, DSD512\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFormats\u003c\/th\u003e\n\u003ctd\u003eLocal playback 384kHz\/32-bit, DSD256 native, MQA · USB DAC 768kHz\/32-bit, DSD512\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSystem\u003c\/th\u003e\n\u003ctd\u003eAndroid 13 · Snapdragon 680 · 8GB RAM · 128GB (about 112GB available) · microSD up to 2TB · 5.5-inch 1080 × 2160\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWireless\u003c\/th\u003e\n\u003ctd\u003e2.4\/5GHz Wi-Fi, DLNA, AirPlay · Bluetooth 5.0: transmit LDAC, LHDC, aptX HD, aptX, SBC; receive LDAC, SBC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBattery\u003c\/th\u003e\n\u003ctd\u003e4,400mAh · 15.5h (3.5mm) · 13.5h (4.4mm) · about 1.5h fast charge (PD3.0 PPS) · Desktop Mode\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSize and weight\u003c\/th\u003e\n\u003ctd\u003eAbout 138.2 × 71.5 × 17mm · about 258g · retro gold, dark blue or black\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\u003eSuper high gain needs a PD2.0\/PD3.0 fast charger; other chargers charge normally (FiiO suggests 5V 1A or 2A).\u003c\/li\u003e\n\u003cli\u003eFiiO Link lets you control it from the FiiO Music app on a phone: over Wi-Fi or Bluetooth from Android, Wi-Fi only from an iPhone.\u003c\/li\u003e\n\u003cli\u003eLine output is at full volume unless you enable adjustable line-out volume, so unplug headphones before switching to it.\u003c\/li\u003e\n\u003cli\u003eSee also FiiO’s \u003ca href=\"\/products\/fiio-m23-portable-high-resolution-music-player\"\u003eM23\u003c\/a\u003e and its flagship \u003ca href=\"\/products\/fiio-m27-reference-class-compact-desktop-smart-hifi-player\"\u003eM27\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003eIn the box: M33 R2R, leather case and screen protector (both fitted), USB data cable, quick start guide, warranty card and GPL V2 manual.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"FiiO","offers":[{"title":"BLACK","offer_id":57551128985987,"sku":"FIIOM33-BLACK","price":669.99,"currency_code":"GBP","in_stock":true},{"title":"BLUE","offer_id":57551129018755,"sku":"FIIOM33-BLUE","price":669.99,"currency_code":"GBP","in_stock":true},{"title":"GOLD","offer_id":57551129051523,"sku":"FIIOM33-GOLD","price":669.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0960\/3199\/8339\/files\/img_proxy_21c6581d-482f-49ec-8e7b-8321a9819434.jpg?v=1773119334","url":"https:\/\/www.advancedmp3players.co.uk\/products\/fiio-m33-r2r-digital-audio-player","provider":"amp3","version":"1.0","type":"link"}