K11 Compact Desktop R2R Architecture DAC and Headphone Amplifier (Black)

I’ve been running the FiiO K11 R2R for a while now, and it’s an incredible way to step into ladder DACs without spending a fortune. Build quality is solid, the display is clear, and it’s truly plug-and-play. Unlike the standard K11, which uses a delta-sigma DAC chip, this version employs a true R-2R resistor ladder to convert digital to analog (No DAC chip). The R2R architecture gives music an organic, textured feel, and makes its OS/NOS switch worth exploring. Here’s how the two modes behave: •Oversampling (OS) is my default. It keeps rock, classical, and movie scores lively and punchy, with tight bass and precise imaging. •Non-Oversampling (NOS) softens edges and smooths the top end — great for older masters like Silver Springs from Fleetwood Mac, bright recordings, or late-night listening sessions. Switching is instant, so you can tailor playback to the recording. My listening chain is: Bluesound Node (coax out) → K11 R2R DAC → Denon AVR-X4500H (analog in) → Emotiva BasX amp → ELAC Debut 2.0 F5.2 towers + dual REL T/1003 10″ sealed subs. I run the AVR in Stereo mode while bypassing Audyssey EQ on the mains — this gives me the transparency of Pure Direct while keeping my subs engaged. Using the Audyssey MultEQ-X PC app, I let it measure the F5.2s’ natural roll-off and it automatically set their crossovers around 40 Hz. I also keep the AVR’s bass management set to LFE + Main, which blends the RELs smoothly with the towers instead of letting the subs “bloom” separately. The result is bass that feels integrated rather than overblown. Price-wise, the K11 R2R is unbeatable. Many R-2R DACs run for about $1,000 or more, but this one is roughly $175. The high-end models may squeeze out another 30–50 % of refinement, yet they’re not 5–6× better — for most setups, that premium price tag just isn’t justified. If you’re curious about R-2R sound and want a DAC that punches way above its price, the K11 R2R is an easy recommendation. In addition, this DAC has made my Sennheiser HD650XX headphones come alive for the first time ever! This DAC is a no-brainer upgrade IMHO, however, based on the reviews you may want to buy the additional extended warranty as this product only comes with a one year warranty. Thank you for reading this and I hope it was helpful!!

This is my first real audiophile grade DAC and on day 1, I remember hearing the K11 R2R for the first time. The difference a dedicated DAC makes versus my phone DAC Dongles or previously, my Astro A40TR DAC I used for music & gaming was completely a night and day difference. I heard no static, no hiss, simply organic lossless music for the first time ever. It was beautiful like moon on a clear night sky. It was fun going through all my genres of music and favorite songs, like I was listening to them all over again for the first time. I have the DAC Set to 24-Bit 48.1Khz / DSD: 1-Bit (Which can only be achieved on the latest firmware that you have to manually install yourself.) Everything feels smooth, with a touch of warmness and clarity. Currently listening these IEM's: The AFUL Performer 5+2 & SIMGOT Supermix 4 / while using Low Gain Mode at ~45-55% Volume which is my personal sweet spot for listening on these IEMs. CONS: -My only cons with this is turning off the DAC requires you to hold the control knob down for (5) Seconds every time you want to power it off. It's not a big deal, but something to note. -No onboard EQ Functions. Not a deal breaker (software adjustments are just fine). Other FiiO Models like the K13 R2R have those more premium settings, but would have been nice to have at least on the R2R Version of the K11. -Stock Rubber Feet aren't very strong. DAC slides around a lot when pressing the 1-Button Knob. You have to order replacement rubber feet. THE VERDICT: In conclusion, for the price, you get a very nice small and compact Desktop DAC that looks elegant and from what I've heard competes with some much higher end DACs / R2R's at a fraction of the price. This is the budget king of DACs.

I tried quite a few DACs including some high end ones. I have 11-year old Denon DA-300USB that none of current DACs could even match (bifrost 2/64 would); until now - thanks to FiiO K11 R2R DAC. I find it intriguing when headphones are used to express sound stage observations - there is none whatsoever - it is all playing in your head - the sound stage is like 6-12" long. There is nothing to talk about it, really. Anyway, another intriguing findings is why other DACs failed to deliver sonic clarity, despite the excellent frequency response, low noise and distortion. I noticed that those DACs can deliver good quality to headphones users as channels do not interact - go straight to each ear. Different story with speakers, the channels do interact and if there is any phase shift at given frequency range (specially treble) - it can just cancel or reduce the final frequency response at the listening position - that would degrade experience severely. So those DACs do sound good in some compositions, but then fall apart in others. Neither my Denon, Schiit Bifrost have this issue, but many current DACs are making this mess. I am glad FiiO K11 R2R DAC is also free of this weird effects and delivers clean, slightly warm sound and good soundstage when used with speakers. Good job FiiO! PS: I noticed that with extended listening to FiiO I am getting fatigue and headache. I like elevated lows and highs in general, but in FiiO case - I was getting way more than I asked for. My advice - go to setup menu and change: OS (oversampling) to NOS (no over sampling). R2R are better without any oversampling. The sound will become more natural and neutral and you can listen to it for hours. It is still a little bit buggy, but not sound related: IDLE standby does not work, display shows signal sampling rate when there is no signal. I hope FiiO will address those bugs in the future. the LO (line out) mode makes very high voltage, well above 2V - it could cause clipping in some preamps, the only way is to switch to variable mode and reduce volume to ~96dB

I read about R2R DACs online and felt right away that this is a revolutionary breakthrough by FIIO and their engineers in delivering a DAC this good at this price point. Anything close to this DAC will cost about $ 1,000 or more. I know what a good DAC sounds like since I own two Denon DSD DACs. Wait, the balanced headphone out is an added bonus since its drives my Hifiman Sundara closed back headphones without even breaking a sweat. Wow ! I almost fell off my chair when I listened to the first song on this R2R DAC. It was Diana Krall's Temptation using my Hifiman Sundara closed back headphone bought right here on Amazon. Muddy Waters Album sounds amazing. I kid you not. This DAC is equipped with a 4.4 mm balanced headphone out which drives the Sundara Closed back without breaking a sweat using the balanced headphone output. Obviously you need a balanced 4.4mm cable of which I bought right here at Amazon at a reasonable price. First a few initial house keeping setup chores must be performed prior to using this DAC. I feel that its mandatory to have the initial setup correctly to enjoy this Treasure. Read the instruction manual first, its easy to understand. This is how I set up mine, Gain set to high. Output, switch Output PO: Front Panel headphone out with adjustable volume, SAM or sampling used is NOS, you can also select OS for oversampling for a different sound signature. The NOS gives you a Vinyl sounding unadulterated sound signature. UAC usb working mode for my Mac mini 2024 is UAC 2.0. I honestly don’t use Windows computers but I suspect that it should work fine for Windows. With my Denon DSD DAC I have two separate Headphone AMPs, A Preamp for connecting the two separate headphone AMPS and had to add an EQ to achieve the sound signature that I preferred. Imagine, with the FIIO R2R DAC you just need the DAC only and the biggest bonus is that it has balanced and unbalanced Headphone out both of which which drives the Hifiman headphones without breaking a sweat ! This R2R DAC by FIIO is a game changer. All you need is the DAC with ZERO addons and you are good to go. Don’t be fooled by an Audiophile, you can get Hifi at an unbelievable price in a DAC which punches way above it’s price point. All of this for an insane price of $ 200 Canadian Dollars. Mind you, for very high impedance headphones you will definitely need a separate headphone AMP. Most Audio Enthusiasts don’t usually use very high impedance headphone and this R2R DAC will meet the needs of ninety nine percent of Audio Enthusiasts. Now comes the sound. I am an Audio Enthusiast and prefer not to use the term Audiophile since there is no authorized designation or qualification to address oneself as an Audiophile. I use FLAC or High Res music with Audirvana Music Player and Hifiman Sundara, and a few other really good headphones. I am not loyal to any particular band, I choose headphones which correspond to my preferred sound signature. To my ears, this R2R DAC delivers a warm sound with PERFECT lows, mids and highs with a decent soundstage and excellent instrument separation in the NOS mode. The experience can be described as relaxing. Wait, you don’t have to purchase a Tube AMP. This amp sounds tube like in the NOS mode. If you prefer a different sound signature you can always choose the OS mode and it will still knock your socks off. This DAC is highly recommended and is definitely a Giant Killer. Get yours from Amazon. I am not in any way affiliated with any product mentioned here. This is my honest review and my personal opinion.

I use this on my computer for a near-field scenario. It replaced a Topping L30 and E30. The amp is unchanged. I knew I wanted an R2R ladder dac, but most of the options were > AUD 1000. I made the right choice, and now I have sound-stage and placement in abundance and an accuracy to the sound that reveals yet more of the music I have in my collection.

Works great, excellent value for the buck. Highly recomended

Good choice to recommend. Don't take up much space and the sound was good

Great sound