My out of the box impression of the X1 compared to the X3 and X5 initially was not great and FiiO did warn me that I might not like it. The X1 sounded a bit thick, bass heavy and not as resolving as I had hoped with a narrow center focused soundstage. It seemed the X1 was struggling a bit for air also with an attenuated treble response. That was the first 30 minutes or so. Fair enough maybe it’s not for me but I have clocked up about 50 hours on it solid now over the last few weeks and comparing it with the X3, X5, the HM-700, a borrowed Sansa Clip and even my old Zune HD I have tempered my thoughts a little and maybe, just maybe a little burn in has helped clean it up because it sounds far less thick now than my first listening session. Compared with the other $100 or less DAP’s it is perhaps the most complete sounding DAP for hi-res and general musicality.

X1, X3 and X5

Tonally the X1 is warm to neutral and more in line with the X5’s neutral but smooth tonality than the warmer and more laid back Wolfson driven X3. The X5 sounds more detailed and controlled than the X1 with a much blacker background. The mid range on the X1 is slightly more forward and center focused than the X5’s more reference type signature but the X5’s wider and more accurate soundstage can leave the X1 sounding a bit congested. The X5 also sounds much cleaner and more spacious than the FiiO X3 but there will be some who will stick religiously with the X3 on account of that warm musical Wolfson sound that used to be the house sound of FiiO for many years.

Truth be told I initially dismissed the X3 when reviewing the X5 but I have come back to it time and time again for the way it the way it gels with husky female jazz vocals and other lazy day slow paced genres. Placing the X1 against the X3 in these genres and the X3 for me shines and pulls ahead of the X1. Both are decidedly musical and fun but the X3 is just more pleasurable and forgiving especially on female vocals. Shelby Lynn’s ‘Revelation Road” just sounds that bit sweeter and more lush on the X3 over the X1. Both the X3 and X1 though are more colored DAP’s than the X5. Both the X1 and X3 have more elevated bass responses than the X5.

Overall for acoustics, jazz and slow paced genres I still prefer the X3’s more lush, detailed and forgiving presentation over the slightly thicker and bassier but more neutral X1. There is still some magic in that old Wolfson house sound. The X5 reference sound and more convincing and accurate presentation should be the audiophile’s choice. I wouldn’t pretend that the X1 at $99 is getting you 99% of the sound of the X5, because it simple is too colored, thick and lacking in clarity to get close enough to justify saving the money. It would seem FiiO have the trinity of DAP’s separated quite nicely in that respect.

X1 versus the Sansa Clip

The X1 is more balanced, detailed and has less background noise than the minute Clip (Rockboxed). The Clip’s bass signature is more dominant than the X1 but at times it came across as boomy and soft rather than tight and impactful. The X1’s bass presence might be more noticeable than the X3 and X5 but it has better detail and texture than the Clips low end. For the first few minutes you might think “oh wow the Clip slays the X1 bass wise” but after spending some more time with it actually just feels one dimensional and with a much slower decay making it almost frustratingly omnipresent.

The X1 also displays a higher degree of control in the mids and upper mids and not as peaky as the clip is in the lower treble. The Clip can sound harsher and less smooth than the X1 as well as exhibiting a higher tendency for sibilance on vocals. Diana Krall’s husky jazz vocals on “Where or When” are far more believable and clean on the X1 compared to the Clip’s sibilant snake pit performance. In its favor the Clip has a bit more energy in it’s treble than the relaxed FiiO X1’s treble response which can come across as bit flat and lacking in sparkle.

The Clip does very well for its lower price and it has a type of tonality that works well indeed for those are comfortable with a bassy but musical sound signature with some decent extension in the highs but not too fussy on the details. Just for me personally the Clip lacks the X1’s superior balance, control and noise free background as well as at times sounding a bit too boomy.


X1 versus my old Zune HD

I still have it and I still like it. The interface and form factor still make it a fun and sexy looking DAP though its lack of Flac and lossless codec support in general usually means it doesn’t get the same airtime as my other DAP’s. I remember when it first came out people were critical of the UI saying it was hard to use compared to an iPod but fast forward 2014 and it’s the bedrock of Windows on the mobile phone (Metro UI) so going back to it now I can’t see people having the same degree of difficulty. Certainly it’s a lot more visually appealing than FiiO’s UI though lacking in the same audiophile options like line out and EQ. It still can push 20 hours plus also on the battery life using MP3 320k so they got a few things right with the Zune that modern audiophile DAP makers are forgetting. Plus it has an Analog radio!

Playing lossy 320k MP3 (Pink Martini’s 1969 album) unamped on the Zune HD it certainly has the edge on the Clip with a much more balanced and even response and a higher degree of clarity. Using a nice smooth earphone like the Westone W4 it’s actually quite pleasurable without any undue harshness. It still possesses a degree of sibilance in the female vocals, much less than the Clip actually but a bit more than the X1. The X1 also has a slightly richer and weightier bass the mid range making the Zune HD sound slightly thinner but soundstage wise the Zune HD held its own sounding reasonably wide and spacious.

X1 versus the Hifiman HM-700

The X1 is more powerful than the HM-700 and has a much thicker and more weighted warm to neutral sound than the brighter but ever so slightly thinner HM-700. The HM-700 struggles more with full sized headphones and is more comfortable with careful matching with IEM’s than the X1. Neither the X1 or the HM-700 have the biggest soundstages but the HM-700’s slightly more forward treble response might give listeners the impression the HM-700 has slightly better high end extension than the X1. In it’s favor though the HM-701 does have that balanced mode and seems tailor made for their own RE-400 and RE-600 earphones.

X1 versus the DX90

Don’t even go there unless you totally hate the DX90’s sound signature and want something far less dynamic, crystal clear and wonderfully engaging to use. It’s like trading your V8 (by popular demand, not the V6) Mustang for a Fiesta Sports hatch. Of course you are paying a fistful more for the DX90 but then that is the whole point. I do not expect the X1 to even compare favorably to the DX90 and it does not but for those cost conscious people thinking they might have a secret bargain in sound and functionality you simply do not. The DX90 already bests the X5 in my review of it a while back and it my go to choice of mid range DAP for some time now for sound quality.



Of all the non FiiO DAP’s tested the X1 has the most grunt for driving headphones and high impedance earphones. The Clip performed a lot better than I thought it could to be honest but it started to struggle a little bit more on more demanding headphones such as the HE-400 whereas the X1 actually drove them significantly better if not as good as the X3 or X5. Strapping the X1 to a small but capable amp like the E11k in line out mode produces an even better and cleaner performance with headphones with a very low noise level. The E11k is a total revamp of the original E11 sounding more mature and balanced but still retaining good power and portability. The E11k and the X1 combined are a potent budget combination that does very well at driving a lot of medium powered headphones. If you really want to amp the X1, using line out combined with small portable amps such as the E11k, E12 or the E18 is probably going to be the most sensible option before we lose that budget appeal. Having done the majority of my testing with a Westone W4 I can also tell you the X1 is more than capable of working with a wide range of higher sensitivity earphones with minimal background noise.

Click here for final thoughts…

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About The Author


Founder & Owner of I first started reviewing in the late 80s (ouch!). Back then it was albums, rock concerts and interviews with a typewriter for the local rag. Now its desktop/portable and digital 2.1 audio on a rather nice laptop. How time flies.

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  • brcmrgn

    Another major advantage of the X1 over the HM-700 is that the X1 can actually play all of my 16/44 CD rips. The HM700 can’t play about 1/3 of my CD rips (those ripped with EAC). These files play fine on the AK100, AK240, X1, X3, X5, DX50, DX90, and HM-901 and show the correct bit depth and frequency on all of those players. I contacted HIFIMAN support and they acknowledged the issue and refuse to fix it. Their reasoning is their engineer’s time is much more valuable the their customer’s time. They suggested that I convert the files to WAV and back. Customer support at it’s finest!

    • 24bit


    • headfonics

      So in short you were told the Jobsian equivalent of “holding it the wrong way”.

      • brcmrgn

        True. I’m very surprised by this behavior from HIFIMAN. All of their other products that I have are quite good. I think that this refusal to fix a known software bug is outrageous. I now ise it for MP3 files only.

        I am really enjoying the X1. I really like the form factor (without the silicone case). The controls make sense and work well.

        • headfonics

          Don’t you think its a bit funny that FiiO did sterling work on the new button design and labelling it only to pack it with a silicon case that hides it all?

  • oldandcurious

    Oh, okay…. Thank you for this forthright review. I was intent to get one for its form factor being smaller and lighter than my X3, planning to mainly use the latter as a DAC for my O2. This article changed my opinion that either I get another X3, save up for the X5, or wait for the X3K 🙂

    • headfonics

      ha! X3k, nothing would suprise me on that front. I would encourage you to think DX90 over the X5 but that is just my personal taste.

  • Keith Cassinger

    Radio? puhleez.

    • headfonics

      I personally love radio. so yes pls 🙂

      • Keith Cassinger

        Wow, with satellite and car radio do you need it on your DAP? Lame.

        • headfonics

          Do you walk around with a car or a satellite on your head Keith? Last I checked malls dont allow you to bring them in either and there a ton of countries that do not have satellite radios.

  • lenin reddy

    What amplifier you would suggest for my fiio x1 , I have sennheiser hd7dj headphones and shure se 215 for better soundstage and clarity ?