Reviews by artpiggo


Headphoneus Supremus
Pros: Incredibly Euphonic vocal, Micro details, Depth Staging, Extended treble, Warm Presentation, Great Battery Life, DSD Mode
Cons: Speaker quality could be better, sound stage could be wider, no Line out, Hi/Low gain mode, no micro SD slot. Might be fatiguing for some people.
          At first I didn’t expect myself to buy another phone after 9-month-old Letv Max which is still in solid condition and still use as one of in-house source from time to time which really makes full experience of watching movie. Thanks to its big screen and wide soundstage sound.
          But then I just think that maybe…maybe… I should try again. I need to choose between onkyo granbeat and vivo xplay6. I think for days. Granbeat has balanced mode which is really nice but it comes with higher price tag with micro sd slot and japan quality. While vivo on the other hand, is also spec-wise, TOTL Chinese smartphone, Good camera, high quality of sound and also cheaper. At last, I choose vivo xplay6 this time just because I now wonder how they will implement newly-launched ESS9038 chip to see if it worth keeping in my phone collection.
Tested condition: 
-  FW Version Tested: PD1610_D_1.20.5
-  Music Player: Stock Player (iMusic)
-  Set Airplane Mode ON
1. Writer Introduction:
Prior to jumping into sound section, I just want to provide all of information I know about my tested cans and my sound preference. In case I have different opinion on cans’ matching differently from others’ opinion or review, you can understand that various factors might make review different. 
This part will also include unboxing and accessories and some essential picture of the unit and the UI for reader to visualize easier.
Lastly, there is a sound comparison section with some phones for pointing out the character and quality of this phone as well.
1.1  List of owned cans and stuffs
IEM Tips, earbud foams
Module / Special Mod
UIEM: 64 audio U12
Brimar Supreme Reference x4
Eidolic both 2-pin and 2.5 mm plug
Ortofon M
Module G1
CIEM: 64 audio V6S
Brimar Quantum SXC
3.5 mm Plug Gold Oyaide
Remolded by UM
Earbud: Rose Mojito
Brimar Quantum SXC
2.5 mm plug Ranko
Mr. Chote light blue foam
Adapter used to convert from Balanced plug to Single End
- 2.5 mm female to 3.5 mm male Viablue plug DIY (since my cans are all 2.5 mm balanced but the line out and used external amp itself are 3.5 mm Single End)
1.2  My Sound Preference:
I love fun sound signature but not basshead type, prefer balanced sound. Crazy on big 3D soundstage and black background (low noise floor)
1.3  My Song Preference:
JPOP, Anisong, Movie OST
1.4  List of Song used for testing purpose
Artist name
Song name
Testing Purpose
Drum, Impact, Bass
Benjamin Anderson
Next of Kin
Lonely Chaplin
Hanaoka Natsumi
Tokyo Cloudy
Wagakki Band
Senbon Zakura
Instrument Separation
BlackYooh vs. Siromaru
Black or White?
Kimi ga tame
DSD 2.8 MHz
DSD Mode
1.5 Unboxing and Accessories
Figure 1 shows the size comparison among 4.7” DX200, 5.2” xplay 6 and 6.3” Letv max
Figure 2 shows the box package of xplay6 which comes in 13” square white box with silver screen of xplay6 logo at center and vivo at side view.
Figure 3 shows the gold-color front screen film, transparent TPU case, and Black rubber case with “vivo” screened at back coming as accessories
Figure 4 shows other essential stuffs like fast charge power adapter, micro usb cable, sim card needle, and iphone-look-alike earphone called vivo xe680 (I didn’t test it. Don’t ask me to.)
Figure 5 and 6 show front UI and back cover which comes with 12 MP f1.7 Dual Cameras.  Yes, bokeh mode is nice. 
Figure 7 shows iMusic UI. Please see Pros and Cons below
Pros: Support CUE playlist, Local song separated in Artist/Albums/All songs/Folders and one click music scan button., Native DSD. Lyric Support. Beautiful and clean interface.
Cons: a little clicking noise when changing songs with different sampling rate “44.1kHz to 48/96kHz”and vice versa and when playing DSD list, Hard to find online album covers if missing,
Special Note: HQ (High Quality) = DSD format while SQ = FLAC (either CD quality or Hi-Res) 
Figure 8 shows DSD mode meaning and Hi-Fi compatability.
2. Sound Quality and Character
2.1 Speaker comparison with Letv Max
2.2 from 3.5 mm headphone out
Let me introduce my cans’ sound signature first.
  1. 64 audio U12
Can signature: balanced sound, fun, warm mid, deep bass, good separation and 3D stage, subbass extension.
  1. 64 audio V6S
Can signature: smooth treble, 3D stage, neutral, vocal stood out. Might not best at separation.
  1. Rose Mojito
Can signature: wide soundstage, analytical, bright treble. It’s strange that that its spec has low impedance and normal sensitivity, it does need volume more than the other two.
Please see 1.1  List of owned cans and stuffs for detailed info.
Rose Mojito
Drum, Impact, Bass
Nothing to say much. Perfect. Fun sound, live, good dynamics, bass quantity is right. Impact attack makes me deep in Budokan concert.
Compare to Letv max, I wish it could have a little more impact attack and bigger bass note for this set up to enjoy.
For earbud, it does give enough unique tight bass and impact with good instrument separation. No interference among each frequency.
Give clear and resolute string movement and accurate position.
Give smooth sounding of string. Still not see the movement of string much as with U12
Perfect matching. Same impression as U12.
Really its strength. I never feel this euphonic vocal since meizu mx4 pro. Vocal imaging does really stand out at front. “Can I just enjoy music and leave this review behind?”
Crystal clear. Extended treble already. Perfect.
Stand out from songs. Give a smooth treble. Not thunderous but crystal clear
Treble seems to be tame while it is still crystal clear and presentation. But not bright peak as it usually is.
Instrument Separation
Separation is perfect in this set-up. Layering is top notch. Field of depth is mind-blown.
Instrument separation still not good enough to my expectation. Wish it more airy, wider.
It is only can that gives airy transparent presentation (might because wide soundstage of mojito.) Instrument separation is top notch.
Feel lively with EDM-speed song thanks to tight bass and good dynamics
Subbass is already there. Perfect matching already
Subbass could be a little more would be perfect.
Subbass already good enough for EDM.
DSD Mode
Really beyond my expectation. If the records is high quality. Vocal is really real. String does really stand out and see string movement without concentration. Micro details are revealing. “Can I just use this phone as DSD player only now?” this is what I really think.
From trying 3 of my iems and earbud, I summarize xplay6 as
  1. Euphonic/Syrupy vocal: You are feeling sitting near with vocalist. Sweet Natural. Outstanding Vocal image is so beautifully shaped without any interference with other frequency.
  2. Depth soundstage is mind blown. Never see the drum impact transmission from the backside at specific position this much before. Layering is also top-notch. There is no feeling of congestion of each instrument and vocal. Well, I would like to say soundstage should be wider in order to give more airy presentation which will be beneficial for big band music.
  3. Extended treble. Really feel the treble coming out so clear and crystal without any suffer or fatigue (at least for me).
  4. Bass is tight enough to enjoy rock music with fun with adequate quantity. Not muddy or leave too much decay or feel bass shaking.
  5. Deep Bass does nicely extend to the enjoyable extent but not their strength compared to DAP which really does fullest deepest experience which warps you to another world.
  6. Impact is so powerful. Well it might not such an overwhelm imaging / full compared to DAP experience. But yup there it is. Can lighten up rock music alive.
  7. Micro Details really comes out above my expectation for stand-alone smartphone without much concentration. People who love smooth sound might find it fatiguing. But as I have stated at first about how I am thrilled with noticing more micro-details from small quiet instrument like shaker or tambolin.
3. Phone comparison 
Disclaimer: I owned Letv Max and LG V20 is my friend's. I tested it with 64audio U12 + G1 module only. Anyway please take this comparison with grain of salt.
Figure above is only representing warm/cold tonal comparison.
  1. Letv Max (FW 20S)
    1. Treble: Letv max has more thunderous treble extension than Xplay6. In my playlist, I love Letv Max's treble more.
    2. Vocal: Letv max vocal become dead silent when comparing to Xplay6's epic vocal imaging.
    3. Bass: Xplay6 and Letv Max share similar bass quantity and tightness. while Letv max has a little more subbass.
    4. Worth-mentioning Note: Letv Max sound stage is like one dimensional wider and airier sound stage while Xplay6 is 3D stage having two dimensional atmosphere with better layering and field of depth.
  2. LG V20 (low gain because my IEM is low impedance and sensitive enough) (forget to check FW version sorry guys!)
    1. Treble: Xplay6 and V20 share similar controlled treble feeling that it is crystal clear and stand out. Xplay 6 just has a little sparkle of treble.
    2. Vocal: Both share similar natural sweet and euphonic vocal with Xplay6 vocal is closer to listener than LG V20's. 
    3. Bass: Both shares similar warm midbass sounding.
    4. Worth-mentioning Note #1: LG V20 shares quite similar tonal with Xplay6 in my opinion. while I think Xplay 6 is more lively sounding with micro details and strings can be observed much easier.
    5. Worth-mentioning Note #2 If activate V20's external mode to my IEM, sound will become thicker for vocal and boomy mid bass with more powerful impact which I think low gain is better matching in my case. This is why my review can be different with others' thought.
Loudness/volume matching
A little bit add up from review: I forget to talk about power output (loudness/volume matching). 
using 64audio U12 
50% volume of vivo xplay 6 HIFI mode equals ~65% volume V20 normal mode 
50% volume of vivo xplay 6 HIFI mode equals ~50% volume V20 external mode 
using HD800
85% volume of vivo xplay 6 HIFI mode equals 100% volume Letv max HiFi mode 
I really would like to say that vivo xplay6 has done everything right with this flagship device being the first company that implements ESS9038 in their device and done a good sound tuning. Even though there are few constraints. For example, Hi-Fi mode should be applying for all apps like Letv did and clicking noise when changing songs with different sampling rate, it does have DSD mode which works perfectly with iMusic App which pushes listening experience standard up beyond among other audiophile phones. The sound character is a little warmish, good resolution, lively, depth staging with top-notch layering for smartphone. 
Lastly, I just have only one wish that it could be wider and comes with 2.5 balanced option for next generation’s flagship line :)))
Man, what kind of music is that? Is it too modern music and phone can play it easily, how about some real oldtimer music like classic baroque and such, we oldtimers want nice audio too!
@Kyrts Please have my apology. I will try practicing listening to some classics music too. I just need more time to digest and understand the music genre I have no confidence to express in words for a while. 
It's a very nice review mate, no worries whatsoever, but if you really mean to get into such classical stuff, then I can suggest something very easy to find around, Handel's Dixit Dominus by Minkowski with Kozena, Massis etc, best tracks towards the end of it.


Headphoneus Supremus
Pros: Neutral Sound, Build quality, low noise floor, high power output, Amp module option in the future, nice screen resolution, smooth UI android
Cons: Not fast charging, slow response in Pure mode, Lots of Bugs from early period of FW, Not native sampling rate for 3rd party app
Tested condition: 
-  AMP Module: AMP1          
-  FW Version Tested: 2.0.78 (WindowsX Free Version) which automatically includes google playstore and support all of google services!
Remind that in stock FW, Google services are removed and unsupported which makes app installation more difficult.
1. Introduction:
Prior to jumping into sound section, I just want to provide all of information I know about my tested cans and my sound preference. In case I have different opinion on cans’ matching differently from others’ opinion or review, you can understand that various factors might make review different. 
This part will also include unboxing and accessories and some essential picture of the unit and the OS for reader to visualize easier.
1.1  List of owned cans and stuffs
IEM Tips, earbud foams​
Module / Special Mod​
IEM: 64 audio U12
Brimar Supreme Reference x4
Eidolic both 2-pin and 2.5 mm plug
Ortofon M
Module G1
FZ: HD800
Cardas Clear
2.5 mm plug from Luna Shop
- SDR mod
- Mimimamo mod
Earbud: Rose Mojito
First batch of stock cable (4 x braided black cable)
2.5 mm plug ranko
Mr. Chote light blue foam
Other stuffs (used to test line out):
- 2.5 mm female to 3.5 mm male Viablue plug DIY (since my cans are all 2.5 mm balanced but the line out and used external amp itself are 3.5 mm Single End)
- Lisa L3 Amp
- Silver Eagle Mini to mini
1.2  My Sound Preference:
I love fun sound signature but not basshead type, prefer balanced sound. Crazy on big 3D soundstage and black background (low noise floor)
1.3  My Song Preference:
JPOP, Anisong, Movie OST
1.4  List of Song used for testing purpose
Artist name​
Song name​
Testing Purpose​
Drum, Impact
La La Land Cast
Another Day of Sun
FLAC Tidal
Benjamin Anderson
Next of Kin
Utada Hikaru
Prisoner of Love
Hanaoka Natsumi
Natsu no Tsumi
Wagakki Band
Senbon Zakura
Bass and Deep Bass
BlackYooh vs. Siromaru
Black or White?
1.5 Unboxing and Accessories
IMG_20170311_122710.jpg     IMG_20170311_122725.jpg
Very beautiful grey-black marble-like box of DX200 with logo and "DX200 ibasso Audio" in white at side of box which gives a professional and formal welcome to us. On the front. it has a skin stamp of ibasso logo and "DX200" at the top.
IMG_20170311_122740.jpg     IMG_20170311_122912.jpg
Disclaimer: I didn't use any cutter or samurai sword or anything! It is being like this out of box
You might notice that I have already peeled off the sticker sheet which is written "DX200 - Reference DAP - Dual ES9028 PRO" in gold color which is their unique selling point.
IMG_20170311_123004.jpg     IMG_20170311_123112.jpg    IMG_20170311_122409.jpg    IMG_20170311_123243.jpg    IMG_20170311_123604.jpg
Inside, there are 3 separated box. In the left top box, there is warranty card, Start guide card and sturdy nice brown case for DX200!
Even the case is very beautiful and solid. I didn't use it much because it makes Perfect design, curves and convex of fully-CNC DX200 device less stand-out!
In the top right box, it is cables box including coax cable, balanced plug burn-in cable (I really love this!) and most picturesque USB-C cable for data transfer and charging.
Testing the sound with some of my favorite song out of box on my bed with 2.5 balanced 64 audio U12 is bliss!
ibasso! How dare come with just one micro SD slot! This is why I need to use OTG to cover all of my music. In short, the device is supporting USB OTG to access to second card. Even External HDD is also working which is good thing.
Note: it doesn't need to have the gadget in middle called "ifi isilencer" - I am just kind of making it more complicating and test if sd card still can be read. (it also worked)
1.6 Build Quality and Interface Picture Sample
What favors me most from this DAP is very nice screen resolution (720p) on 4.2” which makes us easily enjoy watching music video, cartoon from either web browser or Youtube thanks to its Android functionality too. DAP's touchscreen is also top-notch responsive compared to among DAP either in higher or lower price range.
ppnv.jpg    ll.jpg     ur.jpg
Left Picture: The right hand of DAP contains volume wheel control, Forward, Play-Pause, Rewind. The bottommost is the AMP module which tighten with 2 tiny screws
Middle: The Left hand of DAP contains the micro SD card slot. At the bottom output shows 3.5 line out, 3.5 mm simgle end and 2.5 mm balanced from left to right.
Right Picture: show the top side of DAP containing Power on/off, usb type C port and coax out
The back of DX200 is in black background having smooth edges and corrugated plastic at top making hand grip more tightly.
Android Mango Player: The song list in album is in alphabetic order instead of Tag ID number which should be fixed in future FW.
Size comparison with my Letv Max and also showing how bright and colorful DX200's screen is.
Also, all third party music apps are working perfectly despite the fact that it is all downsampling to 44.1kHz only for now. But Paul has promised for fixing.
DSC05310.jpg      DSC05319.jpg
Left: Mango OS: Album is nicely separated and show cover image. One screen can contain 7 different albums. The space of each album is nicely distributed compared to 
Right: Android Mango Player: One screen can only contain 4 different albums without showing the artist name. Instead it shows the number of song in each album.
Mango OS UI
 DSC05308.jpg    DSC05305.jpg      DSC05307.jpg
Here is the Mango OS interface. It contains only offline playback only. 
Android OS UI
DSC05311.jpg   DSC05314.jpg
Left: Android Lock screen with Date and Time
Right: Swipe down to see the drop down function controls including: wifi, bluetooth, airplane mode and screen rotating etc.

DX200 Android UI is nicely arranged and so pure and clean. coming with default apps including calculator, clock, web browser, calendar, downloads, file explorer and gallery
Android's Mango music app UI is picturesque and smoothly responsive than Mango OS's Pure music mode.
2. DAP sound quality from out-of-box to fully Burning-in  (Tested with U12 with G1 module)
Interested Topic
0 Hour Mark
250 Hour Mark
Bass is not tight resulting in decay left in the music and leak into mid frequency
Bass is become tighter and enough quantity(neutral) to enjoy music of variety choices and not leak into vocal frequency anymore
Towards dry vocal and have striking /z/ /s/ phonic compared to fully-burnt-in. Vocal is not clear due to leak of bass decay which creates foggy.
Vocal is clear, transparent and express in very natural way. It is not considered as forward or laid back. It is in a balanced position.
Treble is the most part I really found it most beautifully tuned. Extended treble but not create any annoying peaky. It is a crystal clear treble and also controlled with no disappearance of any details.
This is not the most impactful DAP I listen to but it is still impactful enough for enjoy rock, trance and EDM. Not too boomy or muddy.
Soundstage & Imaging
Really impressive big 3D soundstage even out of box. Separation is good.
The atmosphere becomes more enjoyable to listen due to no foggy vocal. Every instrument is more harmonized with stable position.
Cans Matching’s Opinion (all are tested with 2.5 mm Balanced, Slow Filter #5 Mango OS)
Sound Result
64audio U12
Low gain ~75 - 80
It has very syrupy vocal. Listening to Utada’s song makes me fall into her ocean of vocal expression.  Very spherical 3D soundstage. It has both crispy treble and impactful. I can enjoy both rock and edm music. Bass is tight and has sufficient quantity to enjoy dynamics of every song. Imaging is so real and lively. Separation is great. Very musical yet detailed at the same time. I feel like I am flowing into music and left the real world behind.
High Gain ~105
DX200 with AMP1 module is powerful enough to drive this hi-end fullsize. The strings song is its strength from this synergy.  The vocal is euphonic but a bit laid back. The treble is extended and controlled (no high frequency peak). Bass has body and a little warmth. Impact is not that slam. Imaging and separation is top-notch. Even though the bass has body and tight, impact is not bashing enough to enjoy EDM with fun. EDM music seems not to the best matching out from this couple due to its analytical signature. For the vocal, string, jazz including OST, I can enjoy the music with ease and peace without need to lining out to desktop tube amp.
Rose Mojito
Low gain ~80 - 90
Seem not to be best synergy for some kind of music. It lacks some low-end bass and impact. Even if the bass is tight, EDM song is too boisterous to listen to. Vocal seems to be a bit thin but still transparent without laid back. The separation is still perfect among every instrument. Wide soundstage and have all details. The treble is still crispy and extended. However, depth soundstage seems to be lacking. Strings movement is distinctive to listen. The cans seems to be too analytic when matching with DX200 + AMP1
From testing with various cans above, I can confirm that DX200+ AMP1 = neutrality and balanced. It is not towards basshead or vocal-centric or treble-head. It has equally distributed of frequency response which I consider as a good decision from ibasso where leaves every IEM, earbud and Full-size show their own signature with no dressing up the sound a lot. If you are going to review the can’s sound signature, using this DAP will be very beneficial. DX200 + AMP1 is considered as truly "REFERENCE" as stated in the loading screen.
4. Line Out Testing
My Set up: HD800 2.5 balanced > DIY Viablue Adapter to 3.5 mm > Lisa L3 Amp > 1.2 m Silver Eagle Mini to Mini > DX200 Line out (with Low gain setting at Full volume)
Result: The sound is very impressively clean. low noise floor. No grain of treble sound cracking as adjusting volume of the amp. Give very good separation and pull all micro detail. The strings voice is very clear and euphonic vocal. Strings movement is clearer to listen to. However, the impacts is still a little shy with this set up though it is as much as possible this little portable amp can provide.  But in no doubt, EDM is more pleasant and enjoyable to listen to by using DX200 line out as source.
5. OS difference in various aspects
The Interface of Android is very user-friendly and so pure. Almost all functions we can utilize from this DAP are no different than android smartphone nowadays at all except calls and recording.
On the other hand, Pure music mode create some slow response to our touches, slides and tapping which is room for improvement for ibasso to make it more smooth operation.
Below are the comparison Table shows the different/Pros & Cons from variety aspects.
UI Smoothness
Really impressive, very comparable to 2014 android phone. Swiping left right and tapping is so responsive. There is a bit difficult to swipe down the screen which I need to press before I swipe it.
Has around 1 second delay response after swiping or clicking but still impressive considering it is a DAP, not the smartphone.
Library management
For Mango stock music app, I found this to be a little disappointing.
  1. Each album not follows the Track ID.  
  2. In the Album mode, each album uses too large space. One screen can show up only 4 albums which make it tiresome swiping to the bottom part of Library
  3. .cue album cover not showing
  4. A lot of classified –as–Unknown Album if ID3Tag is not fully fill up while Mango OS doesn’t have this problem
  5. Random Pause out of while
In sum, Library management still not very impressed compared to other third party music app i.e. power amp alpha or neutron
So far so good. I find Mango OS has better library management. All Albums are separated correctly even if some of my album contains no ID3Tag (due to my laziness). I think this OS’s Logic is separating by Directory.
 Moreover, each album is nicely spaced. One screen can show up to 7 albums. Also The .cue’s cover image is shown during playback.
There is one big bug which makes me annoyed that is random popping noise when playback is 24bit/96 or 192kHz Hires music. However I believe ibasso Dev will surely fix in future FW.
So far so good. No popping sound. Very impressive.
Scanning Time for 128 GB Card
2 minute 45 second
Third Party App Installation
The stock 2.0.78 Beta is not coming with Playstore yet you can download APK search from Google to install. (don’t forget to set “unknown app from outsource” in Setting)
While WindowsX Free Version coming already with Google Play which makes me comfortable to install everything and update so easy.
(2.5 balanced)
A bit dryer vocal and less quantity of bass and impact compared to Mango OS. Feel Airy than Mango OS.
More impactful and engaging than Android with thicker vocal.
The detail and separation is comparable.
Battery life (screen off most time; 2.5 mm balanced)
  1. Wifi + Tidal = 5 hr 30 minute
  2. No wifi + Mango Player = 6 hr 30 minute
7 hr 30 minute
6  Gain Difference
There are two gains to choose out: is low gain and High gain. Low gain is designed for most IEM while High Gain is used for High impedance Full-size.
While using Low gain will give a balanced tonal while High gain will make crispy treble and high bass and impact quantity. That is why I set U12 + G1 module and Rose Mojito in Low gain while HD800 is in High gain. Nonetheless, in Line out mode, I normally set it at low gain and let external amp does the job.
Since it has adjustable line out, it means you can adjust digital volume control to your line out. Of course, if you are using it for external amp, you can just keep it at max volume (150). It can also be used to High Impedance full-size directly as well by adjusting the volume down and you can enjoy the sound which has been buffer-bypassed which makes the sound cleaner and fuller atmosphere compared to conventional 3.5 mm single end port.
Filter Difference
As we have already known that DX200 comes with various choices of DAC filter in 7 formats.
[1] Fast Roll Off (Linear)            [2] Slow Roll off (Linear)                [3] Apodizing (linear)
[4] Fast Roll off (minimum)          [5] Slow Roll off (Minimun)          [6] Fast Roll Off (hybrid)
[7] Brick Wall
I am quite unsure if my thought is 100% correct in this section. The difference among one another is slight but some are noticeable. I will start by pairing case by case.
By the way, in this section, I use Album “Leo Ieiri – Little Blue”, 24 bit Lossless track from, as Tested Album.
Fast Roll Off VS Slow Roll Off
[1] vs [2]
[4] vs [5]
Fast Roll Off – feel brighter, noticeable treble peak. Vocal is farer.
Slow Roll Off – Less Fatigue and more natural. Vocal is nearer.
Minimum Phase vs Linear Phase
[5] vs [2]
[4] vs [1]
Minimum – Has more micro detail (strings are more noticeable)
Linear Phase – Each instrument is more harmonize
Special Cases which I hardly find difference with common 4 cases above
[6] Despite the fact that it is Fast Roll off. The signature is like [5] which is slow roll-off.
[3] The signature is like [2]
[7] sounds a little strange to my taste. It gives a laid-back presentation but not smooth movement especially when violin and vocal is drawling. All instruments seem farer and lacks body compared to its siblings’ filter.
DAP Comparison
Disclaimer: I do not own any of these DAPs myself. I ask the local headphone shop for generosity to compare with demo units. I come test around 3 times to make sure the comparison is accurate enough and I don’t mess up. Anyway, please take it with grain of salt. All units are tested with U12 + G1 Module
My DX200 set-up: Low gain, filter 5, balanced output. volume ~70 - 80 
AK380 Volume ~90
AK's mid is more forward and bass has more body.
Both seems to be very close in terms of staging, separation, depth and speed.
In term of treble, details and airy presentation, I would give DX200 an upper hand. AK380 give more relaxing and smooth treble.

QP1R (low gain ~35)
QP1R does give more V shape sound. Treble is more extended. Impact is so powerful than DX200.
Soundstage width is a little wider but less depth. While DX200 is 3D staging.
Bass is tighter but same quantity. Listening to rock music is satisfying with QP1R.
However,I can feel that it does give shy vocal presentation. While DX200 vocal is more forwarded and smoothly-pleasing to listen.
Separation is equally good for both
HM901 (low gain ~ 2.5, balance card)
HM901 gives very smooth listening. Not even fatigue thanks to its dark / warm presentation.
Speed is slower than DX200. I do enjoy slow BPM vocal-centre song.
The treble is not extended as DX200, it is very smooth when compared to DX200.
Impact is lesser. But in the same time, I do feel that female vocal becomes too warm and soften.
Resulting in, I do prefer DX200' s treble and female vocal more. DX200 bass is tighter feel lesser in quantity.
Opus#2 (middle gain volume ~105)
Opus 2's vocal does share similar sound signature which is transparent and natural. While DX200 vocal is a little more forward.
Both also share the balanced and neutrality signature very well.
However, I do believe Strings and purcussion 's detail is more noticeable in opus 2. 
The quantity of impact are same for both. Bass has similar in quantity and tightness.
While DX200 has more deep bass in particular. Listening to instrumental in Opus 2 is opening more detail and more analytical.
Separation in Opus 2 is better while managing all detail including jingle sound more pleasant, crispier and fascinating.
I feel that soundstage of Opus 2 is slightly bigger 3D presentation than DX200.
Fiio X7 AM2 (low gain ~65-70)
Fiio's vocal is dryer for x7. Bass is less tight than dx200 and it gives an echo of bass and make me feel like bass is trying to overwhelming the music presentation which creates muddy and foggy atmosphere. Fiio x7 has smoother and less crystal clear treble. Smaller 3D soundstage. Listen EDM with fiio x7 is cramped. DX200 gives a better details and stage and separation.
Disclaimer for comparing with SONY DAPs: I am not having 2.5 to 4.4 adapter. Thus it is not quite fair since balanced mode is believe to be far better claimed by many users. so take this review with some buffer.
WM1A (single end, normal gain ~67.)
Bass is more in 1A. And give the warmer atmosphere while Separation and stage for dx200 is better both width and depth.
Sony has thick vocal - darker and fuller. slightly laid-back compared to DX200.
Treble seems to be harsher while dx200 treble is extended but also controlled.
WM1Z (single end normal gain ~67)
The signature is keeping 'fun' into music. Vocal is smoother and so euphonic.
Bass is a bit less tight and gives a little echo but it doesn't overwhelm the music.
Instead it gives a nicely warm while keeping airy and space. so this DAP is warmer and has fuller vocal than DX200.
It is towards basshead people and listener who love lush rhythm.
Treble is extended and controlled as same as DX200.
Separation and stage is better. I can feel the instrument more "colored", "fun", "lush" and less neutral than DX200.
Fiio x5 iii (70 low gain slow roll off) FW 1.0.9

Fiio give so smooth treble tonal while DX200 is detail monster.

Bass and impact is less than DX200.
Fiio has lesser quantity of bass but tight bass as same as DX200. 
Fiio has clearer vocal but a bit laid back compared to DX200's juicy vocal.
X5iii seems to lack engaging into music which I can noticeably feel in DX200.
Separation and resolution is good but not in the same level as dx200. I also feel less depth soundstage in Fiio X5 iii
9. Conclusion
Considering DX200 is TOTL DAP under $1000 which is able to compete with many DAPs with higher price tag. I consider it as a valuable DAP and make a noticeably huge improvement from my Letv Max, my current audiophile smartphone which also impressed me so much before. As a previous owner of DX100 and AK240, I truly accept it is quite a big improvement in terms of both sound quality and UI & functionality. Despite all the fact mentioned, it still has a lot of room for improvement to get rid of the bugs. Although there are still other TOTL DAPs such as OPUS 2 or SONY 1Z which are widely considered as sound-wise Giants compared to DX200. However, considering the DX200's price, uniquely impressive sound quality, various functionalities and Smooth UI from DX200, as of now, I truly believe I do not need to upgrade to any other TOTL DAP or feel itchy anymore.
@moonstar I have that screen issue from time to time. I use 5kHz router and found no noise while playing spotify.

@jamato8, I have installed Lurker USB app and it compatibles bit perfect with third party app already. So I cant consider this as not problem with iBasso. User themselves need to develop solution which is not right imo.
Are you guys saying that in stock firmware installing spotify apk is not going to be bitperfect? Like android will do up and down samples and make sound poor?