OK so I lived with iBasso DX220 for about 3 weeks and spend at least a couple of hours every day listening to it. Why iBasso DX220? My first DAP DAC was DX80, I sold it just a few months ago to a DAP collector on Head-fi. I loved the sound, everything else was not that good, but iBasso support was outstanding. So when I was looking for a DAP proper, iBasso was on my list, together with M11 Pro. Before I bought it I had a chance to audition DX220 briefly, the sound signature reminded me of DX80, and I liked swappable amp modules. Operating System : Android 8.0, DAC : Dual ES9028Pro DAC Chip, ( Kann Cube uses Dual ES9038Pro) Analog Outputs : 3.5mm Line Out, 3.5mm Phone Out, 2.5mm Balanced Out (TRRS) Digital Out : SPDIF/Coaxial, Optical Out, USB Type-C 3.5mm Single Ended Output (TRS): Output Voltage 3.1Vrms 2.5mm Balanced Output (TRRS): Output Voltage 6.2Vrms Frequency Response: 10HZ-45KHZ+/-0.3dB And "A Total of 5pcs of Femtosecond League Oscillators, With 2 of Them Being Accusilicon Ultra Low Phase Noise Femt osecond Oscillators" !? - I have no idea what it means but the description is impressive Pros: 1. reasonably transparent, the differences I can hear between different IEMs are as pronounced on DX220 as Kann Cube or BHA-1 2. Noise floor level on every gain level is very low, lower than KC 3. Mango OS is step forward in terms of sound quality: darker background, more resolving, less colored, better bass control. That comparing to two Android players: Mango and UAPP 4. Elimination of SRC for all apps seems to be working, I did not hear any audible difference between Qobuz native player and Qobuz with UAPP. 5. Very good synergy with ER2XR and ER4SR. I really enjoy my daily walks with ER4SR and DX220. Good balance with a bit of help from EQ , good dynamic, very resolving at low volume. Without any effort I could hear the level of details that was not possible using the same IEMs with LG30, particularly using ER4SR. 6. For my IEMs DX220 is competitive with Kann Cube, with ER2XR and ER4SR I prefer DX220. KC and Vegas synergy is what I can rave about all day. But Vegas with DX220 pairing on low gain still exceeded my expectations. 7. V-Moda M100 was a good example that iBasso recommendation for burn-in has some merit. Initially it was my main disappointment: for some reason DX220 did not play very well with V Moda M100. M100 bass, which is elevated but reasonably clean, sounded boomy and unpleasant. But after 10h of burn in using supplied cable and maybe 20 hours of listening it changed a lot. Cons: 1. Mango OS UI is beyond primitive, there is no search function, and only basic equalizer 2. Driving high impedance cans is not close as good as KC, but DX220 has a half a power of Kann Cube. HD800S, HD560 sound a bit bright, HD560 which is harder to drive sounds particularly thin. I do not have AMP8 but heard it improves performance of higher impedance headphones. HE500 on high gain max volume does not sound bad but it is not even close to its full potential. The same goes for HEKv2. Again, that only in direct comparison with Kann Cube. IMO DX220, unlike KC, is not a candidate for a portable desktop setup, at least not with AMP1 mk2. 3. Battery life is not that great, and on high gain I do not think I could go past 4-5 hours. On low gain is about 8-9. I do not mean streaming for 8 hours. That would be more like 6. If you are not streaming it is better to put it in Airplane mod. In SE mode it could be better. Build: Comparing to KC, DP-X1, and Fiio M11, DX220 all sockets feel very solid, and pretty much in the right place ergonomically. When you plug in a cable it gives you a nice click when the plug is all the way in. Screen is clear, sometimes not very responsive, I would prefer slightly larger volume knob but maybe because I am used to the KC gigantic wheel. Buttons on side are customizable and work OK. Unfortunately the case that comes with the unit is a bit disappointing: there is no cut for the side buttons, the volume knob is difficult to turn. Swappable amplifier module, DX220 comes with AMP1 Nk2: 2.5mm balanced, 3.5 mm, and 3.5 mm line out jacks. Software: Two OSs, it is in the sense it is a dual boot player: ⦁ customized Android 8.1 eliminates Android SRC path for all applications. DX220 comes without Google Play but it can be side loaded if you need it for any program that need license validation. Qobuz, Tidal etc.. can be simply side loaded. iBasso comes with Mango Player app but Mango app sound quality is a bit disappointing. UAPP is better ⦁ And the second OS is Linux with UI that looks like Mango App, and it's called Mango OS. I will talk about sound differences but enough to say that Mango OS is in different league comparing to the Mango Android app in terms of sound quality. I was intrigued by this non-Android player and it definitely has potential. Sound: Listening was done with AMP1 MkII and balanced 2.5 mm jack, except V-Moda. Headphones, IEMs used: HD800S, V Moda M100, CA Vega, Etys ER4SR, ER2XR and few other borrowed IEMs. I was using Kann Cube as a sound reference. KC has the more expensive version of ES90XXPro chip. DX220 is pretty neutral, IEMs and HPs I tried do not sound any brighter or darker on DX220 than on BHA-1. Performance on low, mid, high gain is very similar it is really about how loud it gets. Soundstage is not very wide but it is precise, instrument separation is very adequate, even with large orchestral tracks. It was very clear with HD800S, if you can imagine narrow sound stage using those, but everything was still in the right place. The background noise floor is very low, better than KC. I borrowed SE535 from a friend just to check the noise level and it was none. It makes sound more airy, and I really liked very good resolution and clarity on low volume. That is what makes DX220 so appealing to me: I can walk listening on low volume and still hear every detail without any effort. For critical listening and in direct comparison DX220 is not as resolving as Kann Cube and the sound is not as clear and naturally articulated. But you need HD800S or ER4SR to hear that. Using ER2XR or any more relaxed sounding IEMS, like MD+, the difference is barely noticeable, if at all. With bassy headphones V Moda M100 or IEMs Vega I had to lower the mid bass on DX220 to improve the bass texture. Bass is not as well controlled as on Kann Cube with high gain. But slight EQ correction makes Vegas well behaving , and DX220 does not have any issues with V-Moda M100. I bought DX220 to use on my walks or use on the flights, not for critical listening. DX220 is a natural sounding player, with very good resolution and clarity, and next to zero background noise. Particularly using Etys ER2XR on the go and ER4SE for more focused listening I really get all I need, at least the way I am planning to use it. Because of DX220 close to zero background noise I am really interested how it would perform with Andromeda or Ara. The hardware on this DAP, CPU in particular, is a bit dated and I would not pay a full price for it, now $979, there are very few units left anyway. But as an open box deal, brand new unit for 30% less looked like a good deal to me.