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Fiio K11 (and K11 R2R) dac-amp

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A quick roundup of my purely subjective comparison between the standard K11 (non R2R) and Mojo 2 bearing in mind level matching was probably imprecise. Using a Sennheiser 58X and HM Sundara, the former both balanced/unbalanced, the latter unbalanced only on the K11 and both unbalanced on the Mojo's single ended outputs. Chord Mojo settings flat. Roon with Quobuz and Tidal HQ streams, BBC Radio. Roon EQ and Xfeed applied to headphones:

Build; The K11 feels very light but solid with it's nicely shaped aluminium casing. The rotary encoder is stepped and feels good to operate. An acceleration sensitive mode would have been nice but I really can't expect that at this price. The LCD is small but very useful and can be dimmed or switched off. The top RGB lighting can be dimmed or switched off. I have it and the front LCD at the lowest setting and it changes colour according to track resolution. Neat.

The Mojo 2 is superbly made and feels solid. I absolutely adore it's idiosyncratic colour changing balls. Kudos to being different. After a short while it becomes very intuitive. The one big black mark is micro USB charging. In this day and age a device should have USB C. Still, first world problems ... .

Features; I wont go into this in any detail, others have done and just google the respective devices for a full run down.

Sound stage; The K11 sounds very transparent in both depth and width and with very precise placement, obviously recording dependant. The equal of the Mojo 2. The Chord perhaps having slightly better height but its difficult to confirm this for certain. Taking this one step further, the K11 may even have better separation as the Chord sounds marginally fuller.

Dynamics, both small and large are largely equal on both at the volume I listen to. If you listen super (!) loud the K11 in balanced mode may have it but the Mojo 2 is far more powerful than any of my headphones require.

Timbre is perhaps a little better on the Mojo 2, with slightly more texture and weight to notes (sounding a little fuller) but the difference is relatively small. Still, I enjoyed listing to single instruments tremendously on the FiiO, they also sound full and life like.

Timing; The Mojo's forte and it's excellent, on point. K11 is surprisingly almost as good. Very engaging. I have used the K11 on its Number 2 filter setting since it arrived and have not changed this.

Bass; Relatively precise on both. Listen to them back to back I was almost tempted to reduce the Mojo's bass a little but I have dialled Roon's EQ in to my headphones quite some time ago and won't change this. What it says about the K11 is simply that bass seems very good. Lean if the recording is like that and full and bouncy if ... .

Mid's; Natural on the K11 with occasionally slightly less texture but on the whole, totally enjoyable and seemingly true to life (spoken word Radio).

Highs; Fairly precise but here is probably where the Chord pulls a tiny bit further ahead with highs that seem to float in air, both sweet and precise with lovely decay if the recording has it. The K11's highs are by no means bad. They are quite precise but can, occasionally lack a little of the full/sweetness of the Mojo 2 and 'air' is a little more constricted. Tail ends of cymbals don't quite "disappear in the ether' as on the Chord. There can be a little more 'grain' on badly recorded stuff. If it's good, it's good. There is no sibilance whatsoever though and the treble never stands out in a distracting way or as a different entity to the rest of the recording (or voice). It's simply that the Chord seems exceptional there to me which is unfortunate for the K11. I am sure that in isolation not many would notice with a reasonably priced/lower end headphone set-up such as mine.

I am not a great reviewer nor do I have the equipment to do level matched tests or measurements (or indeed compare several products with each other) but as I said before, the K11, to me at least, is a remarkable achievement for such little money. At the Mojo's original RRP the FiiO was less than a quarter of the price (less than a third now at Chord's current price reduction).

Yes, the Mojo 2 is better (and offers EQ and battery operation too) but I could happily just live with the K11. Whilst the Chord sounds a little more 'organic' or flowing the K11 is in no way sterile or devoid of musicality. The differences, whilst audible are not night and day (are they ever with modern, well implemented DAC's?). In favour of the Chord is also it's unusual Rob Watts implemented FPGA and that it is made by a true HIgh End company and made in the UK. Bravo to FiiO though for coming relatively close at a fraction of the cost and there is also balanced operation for more power if you need this. I couldn't detect much, if any difference in SQ in balanced mode.

Thanks

IMG-2150.jpg
 
My K11 R2R arrived from Amazon a few weeks ago. My main dac is an SMSL SU-9. I connected the fiio to the same pc running roon, with both dac outputs to my amp, and did some a/b testing between the dacs. Some of it was blind with the help of some friends. The consensus is that the SU-9 is the cleaner, more detailed dac and the fiio was a more full, warm, and analog sound, similar to vinyl. I still prefer the SU-9 for pure hifi, but the fiio is easy to listen to.
Although, the fiio dac has become my favorite now that I am upsampling using hqplayer to 384/24. With the upsampling the fiio really shines, warm and detailed. FYI the OS (oversampling) mode in the K11 R2R does nothing more than upsample the input sample rate to 384/24. I've gotten better results with HQP though.
 
My K11 R2R arrived from Amazon a few weeks ago. My main dac is an SMSL SU-9. I connected the fiio to the same pc running roon, with both dac outputs to my amp, and did some a/b testing between the dacs. Some of it was blind with the help of some friends. The consensus is that the SU-9 is the cleaner, more detailed dac and the fiio was a more full, warm, and analog sound, similar to vinyl. I still prefer the SU-9 for pure hifi, but the fiio is easy to listen to.
Although, the fiio dac has become my favorite now that I am upsampling using hqplayer to 384/24. With the upsampling the fiio really shines, warm and detailed. FYI the OS (oversampling) mode in the K11 R2R does nothing more than upsample the input sample rate to 384/24. I've gotten better results with HQP though.
Did you a/b on headphones or speakers? Could this k11 r2r run something like a Hifiman Sundara without issues? Thanks
 
Did you a/b on headphones or speakers? Could this k11 r2r run something like a Hifiman Sundara without issues? Thanks
I use my k11 r2r w planars, incl the closed back Sundara Closed Back, and it's more than enough power w way more headroom than you could possibly need for them, in both SE and balanced. I just leave it in high gain w everything and it's great.

I love it, and huge upgrade from my Apple dongle > Valhalla 2 combo I was using before, which apparently was introducing huge amounts of noise that I thought was just the amp. Now quiet, clean as a whistle, and plenty of power from both in my new setup (fiio k11 r2r > valhalla 2). Just ordered a Vali 3 though as I was missing some of that tube depth for my planars.
 
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Did you a/b on headphones or speakers? Could this k11 r2r run something like a Hifiman Sundara without issues? Thanks
I a/b'd with Elac Dbr62 speakers. The k11 r2r was able to properly drive my sennheiser hd650s to a very high volume. The Sundara has a very low impedance, so the k11 r2r should be able to easily drive them. I haven't tried iems with it, so I can't tell u if it is noisy. I currently use an SMSL SH-9 as my main hp amp, and I have to say, when fed from the k11 r2r, the SH-9 sounds much better than just using the headphone amp built into the k11 r2r. But, the $169 for the k11 r2r is about half the cost of the SH-9 alone and it definitely punches above its price range. If I was looking for a low cost dac/hp amp combo, this would be the one.
 
I now have the SR11, R2R and K11 here and both the R2R and K11 Delta Sigma are quite a bit different in sound signature. I have them hooked up to an SMSL AO-300 which also performs very well across all of its own inputs and outputs.
There are notable differences as mentioned but I have not spent long enough with the R2R (as it only arrived today) to ground any opinion yet but what I can say so far is bass was immediately noted as were vocals.
I want to give it a couple of weeks before any evaluation of sonic difference can be served up. Very good value though to say the least.
 
I now have the SR11, R2R and K11 here and both the R2R and K11 Delta Sigma are quite a bit different in sound signature. I have them hooked up to an SMSL AO-300 which also performs very well across all of its own inputs and outputs.
There are notable differences as mentioned but I have not spent long enough with the R2R (as it only arrived today) to ground any opinion yet but what I can say so far is bass was immediately noted as were vocals.
I want to give it a couple of weeks before any evaluation of sonic difference can be served up. Very good value though to say the least.
Obligatory reminder that sound comparisons are useless unless done blind and volume-matched :)
 
I am getting a chance to listen to the K11 R2R in my system now at soft/moderate levels and I'm really enjoying it. There is something smaller about the sound stage, but the tonality is very nice and non-fatiguing.
 
Obligatory reminder that sound comparisons are useless unless done blind and volume-matched :)
I was chatting on some other channel recently to somehow who kept talking about all the difference in DACs. I mentioned that I haven't yet been able to discern any difference between the DACs I have, including WiiM Ultra internal, Qudelix 5k, Topping D50III and was told they sound the same because they all use same chipset and to hear all these wonderful differences that I would need to listen to something like an R2R DAC.

So just for fun and my own interest, I have a K11 R2R coming next week. I have a Topping A50III that will take an SE and a balanced input and can be switched between the two. If I were to level match the output of the K11 and my D50III outputs, then connect the K11 to the SE input and the D50 to the balanced input, would that cause an issue i.e. would they still be considered "level matched" if I then used the 4.4mm balanced headphone output on the A50III?

Alternatively, I could use a little RCA switching box I have and take the RCA SE output from both the K11 and D50 and go through the switching box into the SE input of the A50.
 
If I were to level match the output of the K11 and my D50III outputs, then connect the K11 to the SE input and the D50 to the balanced input, would that cause an issue i.e. would they still be considered "level matched" if I then used the 4.4mm balanced headphone output on the A50III?
According to Topping's spec sheet, the A50III has identical gain at each gain setting, between SE in->Bal out and Bal in->Bal out.

In theory then, a level-matched set of DACs should remain matched after passing through the A50III.

Still, you should definitely check the A50III's output voltage while switching to make sure that this holds true in practice.
 
I also have the Fiio R2R, using it on the desk with the SR11. I sold the K11 delta sigma after hearing the R2R. Also using an iFi PowerX improved clarity and detail.
If anybody is using the WiiM Pro Plus with the iFi Power 2 or iFi Power X then I highly recommend this little USB C adapter suitable for 5v applications. It’s a perfect and flush fit for both the iFi power supply and the WiiM Pro Plus. It reduces the extra cable length and imo, better than the supplied option. These are from Kenable online and have a slimmer body than some Amazon alternatives with a pinch at the head for a discreet fit. The actual usb head is uni-body with no join and reversible, nice and clean. I’m not on commission for this link but just thought this might benefit someone whom wants a more tidy connection and less wire. These are also better for those whom use the Fiio K11, K11 R2R and the Fiio SR11 due to the slimmer build on the body of the adapter as the USB C power and audio inputs a quite close together on those Fiio products. In short, very good quality and not expensive either at £1.01p!

One moment, please...
 
I heard that k11 or k11 r2r would be an upgrade to k5 pro ess, is there really a significant improvement? If yes, How does k11 (non r2r version) compare to k5?
 
FiiO should send both versions to the forum owner for assessment.

Agreed. :)

The feature-set on the k11 is exactly what I’m looking for. Would love to know how it measures and if there are any issues with hardware and software. If the manufacturer’s claims were to be independently verified I’d buy the delta-sigma in a heartbeat.

EDIT:

I still think the picture is showing digital waveforms of the recording and that if seen in oscilloscope , the pristine sine wave would appear and not the choppiness and stair effect shown in the example. I'm basing this on the famous video about stair effect as shown below


If anyone wants to delve a little deeper into the subject, I would recommend this video:


Really shows what a less-than-perfect DAC can output…
 
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I gave up on the K11 R2R and am returning it. It doesn't sound natural, especially in the high frequencies, and it's even worse in NOS mode.
 
A few days ago I also came across this wonderful web page illustrating the role of filters in digital-to-analog conversion:

 
I gave up on the K11 R2R and am returning it. It doesn't sound natural, especially in the high frequencies, and it's even worse in NOS mode.
It’s a ‘Marmite’ situation for some with the R2R, you either love or hate it. Personally I found it much more enjoyable to listen through using my Senhiesser 560s headphones than the Delta K11. Also I don’t have any experience with expensive dacs or at least anything over £200 so for me it sounds good enough out of that price range and compared to the same it’s a sound that stands out from the herd enough for me to keep it with the richer vocal tones, punchier bass and smooth highs. I quite like the soundstage too.
I might be a bit more picky with £500 disposable dac money but I’m not so affluent so it’s not something, thankfully, that would bother me but curiosity, is as I have said before an expensive trap, so I avoid wondering too as much as possible. I do not wish to be found in a meaningless want.
 
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