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FiiO

FIIO Warmer R2R Desktop Tube Buffer & R2R DAC/Amp – Fully Differential 24-Bit R2R Resistor Ladder, Dual VU Meters, 46W Linear Power Supply, USB/Optical/Coaxial Inputs, RCA/XLR Output (Silver)

Based on 74 reviews
Condition: New
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$349.99

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Availability: Only 5 left in stock, order soon!
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Arrives Thursday, Oct 29
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At a glance

Condition
New
Color
Silver
Model
WARMER R2R
Weight
3.87 kg
Maximum Supply Voltage
28 V DC
Mounting Type
Freestanding
Maximum Output Power
46W
In the box
AC power cable*1Quick Start GuideSpare fuse tube*1USB cableWarranty card*1
Warranty
1 year

Features 5

  • Four JJ Electronic E88CC Tubes for Sweet, Natural Tube Warmth Equipped with four brand-new JJ Electronic E88CC tubes imported from Slovakia, powered by a true 28V supply. With up to 10,000 hours of lifespan, the tube buffer circuit is carefully optimized to deliver sweet, natural, richly layered tube tonality.
  • FIIO Self-Developed Fully Differential 24-Bit R2R DAC with True Analog Flavor Featuring FIIOs in-house 4-channel fully differential complementary 24-bit R2R resistor ladder DAC. Built with 192 precision thin-film resistors (0.1% tolerance, 30ppm low temperature drift), WARMER R2R delivers an unmistakably analog, musical sound signature.
  • Dual-Channel LED-Backlit True Mechanical VU Meters for Retro Vibes Classic warm backlit stereo VU meters, driven by a dedicated IC. The needles dance with your music, adding a nostalgic, immersive visual experience to your HiFi setup.
  • 46W Low-Noise Linear Power Supply for a Pure, Black Background Powered by a 46W low-noise O-core audio-grade linear transformer. Its high efficiency, reduced eddy current, and even magnetic distribution ensure minimal leakage and deliver clean, stable power for superior sonic purity.

Specs 13

Manufacturer FiiO
Maximum Supply Voltage 28 V DC
Minimum Supply Voltage 28 V DC
Mounting Type Freestanding
Brand FiiO
Number of Channels 2
Maximum Output Power 46W
Model WARMER R2R

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Top Amazon Reviews

Can $350 buy a decent DAC?
Color: Silver
Review Image by Maria Ontiveros
If you're even remotely entertaining the idea of upgrading your DAC to a true R2R ladder, skip the Denafrips Enyo and save around $850 by also skipping the Denafrips Ares as well as this DAC destroys the Enyo and gets you to about 90% of the same quality of the Ares 15th. For comparison I used my Schiit multibit Gungnir A2 DAC with Unison USB implementation and did a side by side comparison with the FiiO R2R warmer DAC. Keep in mind when the Gungnir A2 came out it was priced somewhere between $1,400-$1,600. Does the FiiO warmer DAC beat it? No. But it comes incredibly close. Closer than it has any right to at a mere $350. If I had to estimate, I'd say it reaches a good 85-90% of what my Schiit Gungnir A2 DAC can do. And that's really saying a lot because the soundstage is huge and micro detail transients pop out at you. Here's the thing and one reason why I might prefer the FiiO R2R warmer DAC to my Gungnir. It gives an overall warmer presentation of the music and invites you into a cozier atmosphere. And it does it without losing the sharpness or edge, especially when using the OS mode over the NOS. So if you're looking for something that is warm and inviting without details suffering then I'd say you're not going to get a better, more competent DAC at this price. Are there better DACs out there? Of course, but you'll also be paying about $850-$1,200 more. Save money and get this. It's worth it and you'll be glad you did! ... show more
Reviewed in the United States on July 1, 2026 by Maria Ontiveros
Unremarkable at this price point, which is probably a good thing.
Color: Silver
****revised upward from 4 to 5 stars*** I think its performance at this price point deserves 5 stars. After increased critical listening time, and evaluating with various headphones and amplifiers, and A/B testing against my other DACs, im appreciating this DAC more. I still think the low end could use a little more impact and definition, and it is slightly more relaxed than my preference, but it is darn good. Also, I read a review that upgrading to a Gold Lion tubes improves the low end, and while I haven't yet tried it on this item, I did achieve similar results by swapping Gold Lions into my Muzishare tube speaker amp. I find myself gravitating more to this DAC than the others in my headphone rig (Musician Pegasus, EF400, Grace SDAC, K11 R2R). It's not the last word on detail or dynamics, or low end impact, but it is a really good DAC that is exceptional at this price point. I think the headline of my original review and the use of the word "unremarkable" may seem negative, which is not intended. Often times a piece of audio gear will have some annoying sonic trait that becomes more perceptible the more I listen to it. The absence of that with this device is a very good thing. ***Original Review**** This DAC sounds fine. At this price. If it doesnt have any annoying sonic quirks, that is a win. Like my Hifiman EF400, and unlike my Musician Pegasus, this DAC sounds better in NOS mode. It isnt as holographic as the EF400 in NOS mode, but there is more dimension to the sound with oversampling off. And, unlike the original version of the Pegasus, there isnt too much roll off without oversampling. This DAC sounds unremarkable to me. Nothing annoying about its sonics (which is a win at this price point), but nothing special about it either, except to say that the R2R implementation is devoid of any of the glassiness present in many delta-sigma DACs. I think the overall sound quality is slightly inferior to the DAC section of the EF400, but this item doesnt have the EF400's flaw where lossless files in NOS mode exhibit vinyl-like clicks, so in that regard the Fiio is superior. There is a bit of a relaxed quality to this unit's tone, which im guessing is a function of the tubes. I dislike this trait in this case, but it is a minor gripe. I generally like the harmonic content and warmth that tube bring to the table, but not a fan of what I hear with this device in this regard. Sonically it reminds me of the Monolith Cavallo Liquid Platinum hybrid tube amp, which deadens the sound to a fault, but the FIIO does this to a lesser extent. There is less resolution and detail than my otherwise unremarkable Musician Pegasus, an R2R DAC that costs 3x what this item does. If I had to pick out a sonic flaw, I would say that the bass lacks a bit of nuance and texture. The FIIO DAC does succeed in providing a sound quality that lacks the sonic drawbacks of delta-sigma DACs in this price range, and I would say that it meets or exceeds the sound quality of other DACs in its price range. Therefore I recommend it, just dont expect a sonic revelation. ... show more
Reviewed in the United States on January 11, 2026 by DiamondPilot
Nice Upgrade with VU meters, pleasing sound
Color: Black
Review Image by Seattle Techie
For me, this is a step up from the lower cost entry level DACs I've owned, including the Schiit Modi and SMSL SU-1. In comparison to my SU-1, the FIIO Warmer is gigantic. On aesthetics, I like the VU meters, which reminds me of some of the older receivers and amps that I used to own. The VU meters don't really tell me anything, but adds to the ambience. For my setup, I have a Wiim Pro outputting via coaxial to the FIIO Warmer and mainly listen to hi-res music via Qobuz. I am utilizing the unbalanced outputs since my amp does not support balanced. I've been listening to it over the last few days, and I do like the sound. It feels warmer and bass is definitely punchier compared to the SU-1. Hard to say if the improvement I'm perceiving is because of R2R, tubes or a combination. Due to the tubes, I will say that this DAC gets very warm. Definitely want to give it room for ventilation. The unit also has a Toslink and USB input. I have a CD player, but am connecting it through the Wiim to keep it simple, but nice to have the option of connect it directly to the DAC as well. For USB, I expect that I will on occasion utilize it to connect my iPhone directly to it, for when I want to use Apple Music and get lossless audio from it. The DAC also allows for switching between NOS and OS. However, I'm a bit confused if this works with the SPDIF connections as I've read that some are saying it only works with USB. With my coaxial connection, I do feel there's a difference between NOS and OS, but not 100% sure if that's the case or if I'm imagining it. In summary, I really like the DAC. It pairs well with my system and I feel is a nice step up from an entry level DAC. At this price, it's 4X the cost of a SU-1, which is a sizable jump. I do feel that it's worth it for the sound improvement I'm hearing and it looks nice. ... show more
Reviewed in the United States on June 20, 2026 by Seattle Techie
Great value-not very warm
Color: Black
Review Image by dabz
I have a very clean set of speakers (Focal) and that combination of the rather lifeless sound of digital I needed something to put some "meat on the bones " This did the trick. It sounds juicer but I would d stop short of warm. Background vocals sound a bit more present. I have heard that I need to tubes to "break in" so I might have to come back then. The light is a but bright but the VU meters are a sweet bonus! 😁 ... show more
Reviewed in the United States on July 22, 2026 by dabz
Great Dac that gives that warm tube sound
Color: Silver
Got this DAC for my CD collection. My Cd player has two outputs ran RCA Output to Preamp & ran digital coaxial output on Cd player to the Fiio Warmer R2R. With this set up I’m able to switch between the Cd player output and the Fiio Warmer R2R output and compare the difference in the sound. The Fiio gave most recordings a warmer vinyl like sound, but noticed some recordings I could hear no difference mainly newer CDs that had been remastered. The place that the Fiio really shined is when I played digital files from my laptop via the usb. This really cleaned up the sound. I’m very happy with this purchase ... show more
Reviewed in the United States on July 15, 2026 by Beer Viking
Warmer Than Warm
Color: Black
Well, it's no lie: this is indeed WARM. Too warm for my tastes, though. The FIIO Warmer R2R helped tame the high end on super edgy or sharp recordings - those certainly sounded more pleasing through this DAC, but it was evident at times that it may have been rolling off a bit too much in the high end. On already good (or "even", for lack of a better word) sounding tracks the warmth is there, but again, at the expense of the high frequencies. This was hit or miss for me, with some tracks sounding just fine, but others sounding sort of muffled or veiled; this was especially evident in vocals and percussion, affecting cymbals and high-hats, and also the impact of snare drums. It's a shame because there appears to be a good amount of detail coming through my speakers and the sound stage is fine, but for the most part the "blanket-over-the-speakers" effect dominates. The FIIO Warmer is also very well-built and has an appealing aesthetic and vibe. (I got a Denafrips Enyo 15th recently and while it's not fair to compare as that was twice as expensive, the Enyo provides that extra warmth and "musicality" I was looking for, while maintaining excellent clarity, and having a noticeably wider sound stage and more noticeable separation of sounds/instruments. ) I would definitely check out an updated version of this should FIIO release on at some point and improve upon it. I like the concept, but it just falls a bit short for now. ... show more
Reviewed in the United States on August 8, 2026 by Relayer71
Not going to come close to sound quality in price bracket great value
Color: Black
Excellent value. I have it paired with fiio k17 works great. Just make sure you use balanced connection, there is a slight dB drop with RCA. I rolled tubes in it, sounds Devine. It can play in DSD512. I wouldn't recommend rolling the tubes, it sounds slightly better with tubes I rolled in, but they cost almost as much as the warmer. Stock tubes are plenty good. ... show more
Reviewed in the United States on July 5, 2026 by sabin
Fast shipping!
Color: Silver
Great R2R DAC at an unbelievable price and built quality.
Reviewed in the United States on July 29, 2026 by Amazon Customer
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