Cayin N8ii
Cayin has made their name known in the portable players market since the release of N8, which was the first portable DAP that ever utilized Korg tube, and that shook up the industry a bit. Back then, I was also excited about this release, but when I had the chance to try it out, My impressions were that the N8 was warm, and the Tube was limited at single ended only. Additionally, the design was not as appealing either. So back then by comparison, the players that grabbed me was NW-WM1Z, DX200Titanium, DMP-Z1.
Living in the technological advances age, and modern time, these products are advancing fast, and we have come to the points that many of the new players are being released after one another, and if you keep on buying each and every one by the releases, you would end up either bankrupting yourself, or starving your family, or both. Especially with the current Covid situations. It isn’t easy to target one and swipe your plastic.
But why did I mentioned about the fast advancements of these portable products ? Well, because everything nowadays are digitals, so this hobby is enjoying the similar pace as smartphones and PC industry, with many brands, and shiny new products. But do they really bring the differences ? In my honest opinion, they do bring advancements, but their advancements are not just DAC alone, more like together with amplifier, power supplies, and other practicalities such as UI and SOC or Operating system...etc.. But, portable are limited by the form factor and the battery packs as the power source, and that forced me to look into the power output, like many others, and then the amplification and their marketing slides. It really comes to the point that I am telling myself, DAC doesn’t matter much, it is all about the amplification stages and power supplies.
From here, I have chosen then C9 as an external amplifier, the M30 as a semi-transportable, the Dx220Max/Dx300Max. Were they good ? Yes! And with advanced amplifiers, power supplies, both the Maxes will deserve a spot in your collection, or to give it a try before you move on to other products. Because for a hobbyist, the journey is what making it worthwhile right ?
Having owned both of the Max and currently keeping the Dx220Max with other stuff, I really had no desires to buy new portable players. Especially when I also have the Shanling M30 that has the Dual Korg tubes, yet mounting on the sides as well, with Line out and being modular and so on....why do I look for a new portable ? I actually don’t. Because, after all the years of different players, desktop DAC, and other forms of digital such as DAT, listening to Vynil, and or conversion offline, also reading about digital music engineering’s and so on. I have came to the point that even Andy as a sale rep from Cayin and other brands would agree, that DAC don’t matter much, but rather it is the amplifiers. But, that was the past, which is before the release of the Cayin N8ii.
So, Why am I here holding the N8ii ? And previously was so excited for the N8ii ? Anxiously waiting the shipping notifications ? But more over, why do I write and compile this review ?
My N8ii was purchased from Musicteck, as a return customer I do have some loyalty discounts, and not obligated to write any reviews, and for the willingness to work with customers, I will always rate Andrew and Musicteck to be the top tier dealer from USA. Please read on, if you would like to find out more. If you think that my disclosures about my loyalty discount will bother you, then don’t bother.
The features that intrigued me was the fact that it is “Portable” and with “Balanced Korg tubes”. How did it fit ? That was my question that popped in my mind. Yes, that marketing slides and “leaks” about the ROHM newest DAC chips were not much of an exciting factor anyways. From being a tinkerer, I do know this chip back in the end of 2020 and beginning of 2021, being a newly developed flagship DAC chips. Back then, the AKM/ESS were dominating in the industry. After all, they only carry different signatures, which can be tuned and tweaked or matched with the amplifier to get the final performances. Yet, once again, the amplifier means a lot more or so I thought. Not only that, when speaking of Sigma-Delta, there are a better ways to listen to digital music. That is to apply the sigma-delta conversion with a PC using program that do DSD conversion such as AUIconverter and HQplayerPro...etc... just like different DAC, each program has it own signatures, and you pick your poison. The technical advantage are that they are processed by the computer that play no sound and not on time sensitive to convert the song with less or the same duration Than that of the sound track duration. So less errors, and at the cost of storage. So, it only leaves room for the amplifier to be the most important factor in the chain anyways. Yes, with that presumption, the thought of ROHM chips escaped my mind as a Marketing point, which happened again, and again by using DAC chips as a sale points.
The more I look at the N8ii form factor, the Korg tubes peaking out the window, the more I am attracted. Such playful angular designs that is masculine, yet gently rounded edges, sophisticated, and not going to give you a nasty cut like Astel&Kern. Thick like a brick, but noticeably shorter than the Iphone Pro, and at 400 Gr or so, it is pocketable. However, is also the thinnest and most compact designs ever for sporting Dual Korg tubes inside. Also much Easier to hold in the palm due to the excellent balances in weight distributions. I realized that since the DMP Z1, a lot of makers is making DAP with Gold volume knob now. The N8ii gold knob and its beautiful textures is giving the overall design a nice appealing factor! It is just an attractive giant, that even if the sound performances offers nothing really exciting to me, then I will just appreciate it designs as eyes candy for a while, just as long as it has no sound performances “flaws”. Those “flaws” could be Distored Bass or sibilant trebles. Giving a quick email to Musicteck, I was fast to secure a unit even before the CanjamNYC happened and during the time that Musicteck had to be so busy preparing. Sitting at home and waiting for the N8ii, reading the excitements from Canjam, and the earlier impressions of the N8ii, a lot of it sounded like hypes and people getting too excited with a new girlfriend ..... uhm, new player. However, a couple friends whom I trusted and shared a lot with my preferences just reported that the N8ii has the tendency to be “sibilant”. I almost canceled my preorder, or I did, and yet was convinced that it would fit my preferences well. So, did I say the journey is what worth it ? So experiencing it myself would be a must! Definitely.
I am sitting here, writing this review, because the N8ii deserves to be known, and to be had.
Fore words and Notes: from the simply drop down menu, you have most of all the features easily accessible. Digital filters as an option, we only have 2 kind, slow or sharp roll off, and there are 3 others DSD filters low-mid-high. I do prefer sharp roll off and DSD-low. However, these 2 have very subtle effects. Sharp roll off will have more bites in the textures but less aggressiveness where as slow roll off is a little more gentle around the textures but more aggressive sparkles. Also the P mode will be even more picky and unforgiving than P+ mode (must scale different by gears used, I use ier-Z1R). Ultimately what I found is that loud volume with Low gain, SS, Class AB, P, Slow roll off is a very picky mode, it can easily overwhelm with trebles sharpness, glares, sibilants as in oppose of High gain, tubes, AB, P+, sharp roll off is better in the over all, and recommended. Another thing I also notice is that the N8ii is not only transparent, but also is hyper detailed, it is recommended for lower volume listeners rather than louder, and then once again, the level of details and being forgiving will scale and perform differently with different gears attached. This is the first time I hear my ier-Z1R to be unforgiving and hyper detailed but the HD800S performs beautifully (I take that multi drivers in ears may have problems if you listen loud). Burn-in is very important, you will have the excellent performances out of the box, and after 20 hours it will be aggressive, and this will carry on until 150 hours before it can settle back for a well burn in and we’ll performing as just out of the box. The N8ii Could also be unforgiving depends on different circumstances as I will try to cover it as much as I can
My early impression out of the box were mainly looking into those distorted bass and trebles sheens, sibilants. Quickly verified it with “wanna be starting something 24/96” and “Iron Maiden Senjutsu 24/96”. I am happy that it doesn’t have such traits. However, I was grabbed by the ability to express the Full mid spectrum, packed of details and vivid resolutions. If previously I thought Shanling M8, M30 were able to achieve a very full mid, then the N8ii is even better due to it transparency and dynamic expressions. I just sat there and listened for longer, and longer. I realized that the ROHM DAC chips are special. The sound signatures is a combinations of both of the most sought after, AKM and Sabres and even more. AKM has that analog textures, but overall is warmer and earlier roll off on upper highs, where as ESS is overall brighter with upper glares in trade off for clarity, which recently is improved with the newer generations of Pro series. This ROHM has AKM textures, but with better clarity and almost similar to ESS, but no glare, no ringing, and most importantly it has no specific sound signatures, it conveys the genres as is with a touch of analog liquidity and fluidity in Korg tubes mode together with beautiful bloom and decay, while being a bit faster, more neutral in Solid States. However, even with Solid states, I can not call the N8ii for being analytical. Testing solid states together with DSD files, my conclusion is that the amplifications and analog tuning were done exquisitely to achieve this level of neutrality, details, transparency, but still remaining musically smooth, a very nice balancing. As far as my experiences, all digital devices have it own sound signatures, but it isn’t the case with N8ii. The only word I can use is transparency, and even that can not express enough the performances of the N8ii.
Normally, when the devices have it own signatures, it is constrained toward a few specific genres that it would do wonderful in the while leaving out some others. The N8ii is able to render “Iron Maiden” musicality to JS Bach concertos natural timbres, and bringing both opposite genres to be enjoyable. This is sophisticated, very complex. It is like I am enjoying my LP collections, because only LP were previously able to allow me to enjoy all genres. I have long lost faith into any digital products that would be able to be so transparent and yet providing analog textures, even if any systems can be just a little closer to the LP system, then it would be my dream devices. For that quest, I sought out DAT, NOS DAC, R2R, building my own PC, tinkering with different ideas, yet I gave up, and arrived at that repeating conclusion “DAC doesn’t matter as much as amplifier”. Most of the time, giving digital systems a nice touches of warmth will bring forth that analog results, and with different touches to amplifications, one can give the system a nice touches to be different, enough to satisfy one’s preferences. Such is the case of the DMP Z1, a little warmth of AKM signatures, a very little touch of recessed mid, with exotic components, a more powerful amplifier the DMP Z1 achieved it status of being one of the most sophisticated digital player, unfortunately not portable enough.
Well, here, I am stunned at the ability to be so analog, so vivid, pristine details, great clarity and pitch black background, with no emphasizes into the textures, or sound signatures, and yet the Dynamic prowess is also jaw droppings. I have never heard the punchiness and feeling it as I am now with the N8ii. The transparency in order to represent the instruments unique acoustic housing resonances (not only the Decay, but the resonances and reverberations of the instruments housing from within), and the uniqueness of each instruments are here presenting like an LP playing, vividly, that one can not be confused between each instruments, and with closed eyes, simply listening into it, be able to follow each instruments, without having to focus. The Dynamic, the energy intensity, I am able to feel it, dare saying it that I feel it even better than the original LP of Thriller vs FLAC. I have never thought that it would be possible. I was always told that Digital has higher dynamic range, lower floor noises. But for the level of dynamic delivery, I have yet to witness anything that is closer to an LP, let alone having to surpass it ? I looked up the ROHM data sheets, and it is an current output design. The other chips recently with this design natively were AK4499EQ, which I had the pleasures of owning, it was also very dynamic and with powerful output, the Dx300Max Ti, but I didn’t stay with it long enough. After all, I don’t think I prefer AKM by much ? But with ROHM and N8ii, I crave for it. The next step is to observes the ROHM chips and the Low Pass Filters by Cayin alone from the True Line Out feature!
I turned on my TU-8900 built and customized for my own preferences, the Western Electric 300B, happily laying on the couch waiting for it to warm up the typical 30 minutes with Korg tubes and N8ii. When everything is set up. I quickly compared the DSD512 of “wanna be starting something”, and it 24/96, the original LP, and the reprinted LP.
The DSD512 by AUIConverter did wonderfully well, I was not able to tell the differences between the 3 options of DSD filters featured by the N8ii, but I picked “high” just for the fun of it. The overall presentation is with large soundstage, somewhat analytical and digital aka thinner timbres and too fast decays that is losing it tonality realism (please take notes that the analytical here is a result of the DSD conversions and not the N8ii sound signatures). The 24/96 is with fuller mid, harder slam in each notes and timbres, the realism and analog like feelings is right there, next to the original LP but it does slam harder that I can feel each flicking, tapping. Especially the track “the lady of my life”, the guitars intensity and the drum tap can clearly be picked up. This is the result of the ROHM and Cayin LPF implementations
What is a better way to render back the emotions and intentions than showing the pace and intensity ? Not only the N8ii was able to show case the intensity, the paces, but also the macro and micro dynamic, the detailed textures, but also able to render back the instruments housing resonances, acoustic bass, guitars and grand pianos have never sounded so realistic, especially when using Korg Tubes, where as Solid states will offer a nice and neutral signatures in comparison to the tubes.
I enjoy a variety of genres, with Metal being the genres that I enjoy the least, but somehow with the N8ii, I am able to understand the portray of the music being conveyed. Beside that, I can observe each E.guitarist, the resonances, and other instruments such as keyboards, drums, cymbals....etc. Now, most of the genres is with Vocals. The one thing that I also enjoy with the N8ii a lot is Vocal. Highly textures, with excellent throat energy, and highly detailed textures. But here is where it is a little tricky, in bad recording, Especially with Low and Mid gain (this is true for Line out as well), the vocal may be sibilants and harsh with those “S, Z, T, X”, but with an excellent recordings, the N8ii will greatly reward the vocal like no other players I have had previously. I can easily pick out the air controls, the lips/tongue movements. Needless to say, with this level of pristinely detailed clarity, the N8ii has the tendency to be hot and unforgiving. When the player is physically cold to the touch, it can even easily be harsh when turned on and hit play. It takes about 25-30 minutes to fully shows all of it potentials, or when the player is physically warmed to the touch, then it is the best time to listen to the N8ii. It isn’t that it needs 25-30 minutes to sound good, it just gets distinctively better after 25-30 minutes warmed up. If it was good, it became better, and if it was awesome then it would become....double awesome !
In my opinion, the N8ii has a fully detailed mid, while being very well controlled, and still packed of full and thick density energy even the kinetic energy would show. Mentioning the M8/M30 earlier in references, Shanling M8/30 have this full mid and thick density, but on the N8ii the energy is more and the mid is fuller, more vivid, more energetic with both of them to be more forgiving than the N8ii on bad recordings. In the while the N8ii does not have that induced Warmth, which I would say that it is AKM house sound. Noticeably Vocal is Pristine clear, But at the same time is also very well balanced.
Continuing into upper mid and high, the upper mid of the N8ii is very vivid with excellent resolutions, the clarity is top notch across the whole bandwidth, which is able to represent a huge soundstage with great holographic and precise imaging, each instruments clearly show itself in a fixed position by itself , the spaces that it is staying within, and the air around it, together with the house resonances of itself. Soundstage will scale exactly the way it should be, by the output power and the paired gears. Using the HD800S, I can easily confirm this holography and staging is a little less than Dx220Max, while using true line out from both, the N8ii clearly has a more accurate staging/imaging/textures/dynamic. So it is safe to say that the N8ii limitations is output power. But is it noticeably so ? IMO, there is no other portable that can drive HD800S with such beautiful tubes performances, so in this front, the N8ii is leading and pioneering.
The precision of N8ii detail retrievals is also one of it specialty. In not so well recordings, the N8ii can have hot-and harsh upper mid, or even sizzling high. But could I fault the N8ii for it being hot-harsh-sizzling ? Absolutely not, the N8ii while helping to bring joy and new life into my collections, even some recordings that I thought was not so good (in preferences of genres) are now all coming out alive, and realistic, while some of it will have hot and harsh upper mid or highs. If any devices that is able to depicts which albums in my collections were absolutely bad from the recordings, then the N8ii will be the most unforgiving one, which greatly reward good recording and heavily punishing the bad one. Especially if you often listening to a louder volume. It also helped me to understand that with some touches of colorations here and there by the analog amplification tuning, with the DAC, and specific aims, the bad recordings could be enjoyable as shown with other devices, but that is in no way to call such devices to be neutral or transparent, for example the DMP Z1, Shanling M8 and M30 are all tuned this way. Don’t take me wrong, Sony and Shanling has amazing tuning ability, with great products. But the N8ii is very different, beside the terms of being Neutral and Transparent, I think they can’t even completely explain the performances of the N8ii either. I would like to call it for being the most Honest digital player that I have owned by far. It could be the ROHM or Cayin, or both, but in my experiences with different pieces of equipments, the N8ii has no additional colorations, the typical digital like feelings from most of Sigma Delta, which is the result of Aliasing, dithering order, and modulations, which emphasizes a certain bandwidths and makes up the different sound signatures of different DAC chips by far.
For example, Cirrus chip is overly warm in mid bass, lower mid, and lower trebles, rolled off earlier in upper extensions, and the Mid is also fuller than both Sabres and AKM. The AKM usually lacks at lower mid and thicker upper mid, the Sabres is lacking it throughout, and with Sabres focusing on clarity, quicker decay which doesn’t show enough of the acoustic housing resonances of an instruments as well, together with being brighter and hence also known for that famous glares. The ROHM inside the N8ii somehow doesn’t show that it has any ringing issues, or aliasing issues at all. If I could just award it to be the best Sigma Delta chip, then I would. I am just no sure if it was Cayin developments and engineering, the implementations or it is the chips. I will be able to tell better when I get to hear more of this ROHM chips. One thing is for sure, that the N8ii is the best digital player/source (line out) in both tonal balances and Dynamic prowess, I have heard that is so honest and transparent, and I have heard most of digital topology from sigma delta, to NOS of resistor ladder or R2R, or offline modulating and converting. Such as a result, I am now able to enjoy Metal genres even more than I ever did, together with all of the other genres. Soon, I will have to start collecting more Metal. The tonal balances shows the level of realism even more with Korg tubes. When paying attentions to tonal balances, there will be a different between solid state and Korg tube, with solid states being cleaner and more decisive where as the tubes will be with better density, bloom and tubey. Korg tubes is super clean, with great dynamic, even more tubes like than C9, better punchiness and clarity than Shanling M30, while being cleaner than both. It is worth mentioning that I love soundstage and holography, but with the tonal balances of the N8ii, even though it doesn’t have as much driving power as I would like to extract the soundstage depth and width of the full-size HD800s in comparison to the desktop amplifier, or slightly less than the Cayin C9/220-300Max, I still enjoy the N8ii greatly with hd800S. Though, it has an excellent matching in synergies and driving ability to drive Sony IER-Z1R to be amazing. There are only 3 players that i came across to be able to make IER Z1R to sing up, and the DMP Z1 isn’t one of them because warmth and warmth can be cumulative, rather it is the Cayin C9, N8II -Dx300Max.
The Bass performances. I will call it for being Authenticly realistic, which I am sure will satisfy a lot of people. I am not a bass head, and I wouldn’t call the N8ii anything of being Bassy or bloomy or warm or emphasizing for any part of it. The Bass on the N8ii is simply Stunningly Amazing, even more so when using Korg Tubes and Class AB. The Bass is the one distinction between Solid States and Tubes on the N8ii, but regardless, the Bass is just amazing with deep, powerful, articulated, punching with authority, yet beautifully blooming with Korg tubes. The drum, or Bass housing resonances is driving me insane, it even shows the acoustic room resonances on top of that, together with the spaces and the reverberations clearly for example Pomplamoose recordings. The combinations of deep bass, impactful, controls, dense, together with the acoustic resonances are just a bliss to listen to all genres. Because they all suddenly feel Real! Solid states tuning has a tad less bloom, fluidity, also a tad better in clarity, but both SS/Tubes are all superbly tuned. Class A is also less blooming or impactful as Class AB. But that is probably based on your gears and what you pair it with. I prefer class AB most of the time. Not only that, but the P+ features will only be enabled with AB.
Trebles is highly addictive with great density, airiness, and excellent extensions. One thing I do notice is that by using Cayin/HIBY Apps, the mids and trebles do retrieve even more details and forward mid than Neutron player, this will even further pushing the N8ii to be not so forgiving on bad recordings. Neutron players do have the mid a little more recessed in comparison, and the trebles is a little more attenuated. If you do have problems due to the recordings and gears paired with N8ii, I highly recommend Neutron player. Also another note is that with Line Out features, the Low and Mid gain, somehow do have a different signatures than High gain. I can observe similarly as between Playback apps.
The N8ii is packed full of features such as Power to Power + mode, which raises the amplifier voltage rails a bit further, with 3 Gain level L-M-H, Dual class amplifications of A/AB, True Line out by both balanced/single ended with gain level only accessible in the sound setting menu (not the drop down menu gains, and also do notice that korg tubes are not features in line out mode). Then finally, the Korg tube balanced phones output only. The ability to render the imaging, with detailed textures, superbly clean background, be able to capture the intensity and paces, while being musical with Korg tubes or highly detailed and more neutral with solid state, but mostly the tonal balances like none that I have heard from previous digital systems from desktop to portable alike. It is safe to say that the N8ii is the best Digital Portable Audio Player that I have had the pleasure of owning by far at this very moment. If the only down side is the weak rated output for your needs to drive full size headphones ? With it level of LO performances, you will just find more love for the N8ii with a great desktop amplifier. Even if you down vote the N8ii for it rated output as said, I am afraid that you wouldn’t be able to satisfy even with external Portable amplifiers at all...and in the case that you are, then the output power from the N8ii and Korg tubes alone will surely be satisfying. My final words to Cayin is that “thank you Cayin! I love what you have achieved with N8ii, and in this fierce market with competitions in all aspects, you have proven that you are very innovative, enthusiastic, and reasonable. You have my gratitude and respect”
More Korg tubes impressions: Between the N8ii and the M30, the M30 Korg tubes with AM1 modules is obviously inferior in clarity, details retrieval and layerings, which also hibder the soundstage on the M30 to be a lot more narrow Vs it SS, which the N8ii doesn’t have to face it. With the release of the new more powerful AM2, it has improved a lot more in Korg tubes, larger staging with better resolving ability and better dynamic, but the warmth in the overall tonal balances and inner resolutions is still inferior to the N8ii. Overall, the N8ii has an amazing level of clarity, crisp and pristine details with better soundstages and transparency overall, together with the realism from the amazing acoustic housing resonances by the new ROHM together with the odd harmonics and superbly clean background by Cayin implementations. IMO, the N8ii is the best portable player with Korg implementations yet. Please do not be mislead when people say the N8ii isn’t Tubey enough….it isn’t Tubey enough when you are used with the lower level of tubes design, but it is amazingly Tubey as comparable to other summit fi tubes amplifiers. The N8ii Korg tubes is what my desktop amp and Western Electric 300B Sounds like.
Conclusions: I don’t say this often, but if you considering and weighing options, do put the N8ii on the top of your list. It is a marvelous piece of modern technologies, compact, beautiful and with a performances that will melt a lot of hearts.
Practicality: given that it comes out of the box with Android 9.0 and Google store installed, you don’t need to do anything extra beside downloading your own favorite streaming or music apps. Boot loader is also unlocked for further tinkering if you are into it.
Korg tubes will not turn on unless plugs are detected.
Battery will stop charging when the chassis is warm to the touch, and it happens easily when using the provided leather case. Also, IPad or Apple 30W+ chargers will provide quick charge to the player, or QC 3.0 compatible charger.
Each time Tubes are used, the player generate extra heating, and will be warmed up easily. It isn’t recommended to have it inside the case and plugged in the charger during Tubes operations. I recommend to have it out of the case, and put on a well ventilated areas during tubes operations.
For burn in or continuously listening with charger plugged in, please use Hgain/SS/P+/AB for best results. Even so, don’t have it inside the case or the pocket either as it will heat up easily as well. To operate it as cool as you can, run it with Lgain/SS/P/AB (your mileages May vary, I don’t find L gain and P mode to be that enjoyable)
Charging and heating scenarios :
The N8ii has a very well thought and lay out for heat dissipations. The Dual ROHM chips are a very powerful and demanding DAC chips, and there are dual Korg tubes. Cayin carved out a block of Solid Alumiun as a chassis, and carefully designed so that the 2 DAC chips will be laying against the Chassis as the main cooling mechanism or heat sink for itself. Everything that made up the N8ii are a heat monster. Let’s just look at Snapdragon 660, discrete amplifiers and ROHM Current output DAC chips. This was why even with a hefty 10,000mAh battery, the player is rated at only 10 hours playback by balanced output, during Class AB, P and solid state conditions. It is also the coolest operational conditions in which you can safely pocket the N8ii to go on a bike trips or walking inside your sport wears just fine. It will warm up a bit, but just as long as it is exposed to cool air with adequate air flows, the N8ii is very cool to the touch, certainly is a lot cooler than SP2K and M8.
The problems may arise when you are having these 3 conditions: Inside the stock case, Tubes mode and charging!
Due to the Chassis being so efficient at dissipating the generated heat, the player will heat up quiet a bit, with all of the powerful components within a small chassis as mentioned. Anything that can restrict this dissipation factors, will hinder the operations of the N8ii, even if the body only feel warm about 41C, the internal components are generating higher than 45C which triggers the protection mechanism (you absolutely don’t want to see fire from a 10,000mAh pack). A lot of users and including me, did encounter the non charging, and slow charging, draining off the battery, heat accumulated issues. Because as I mentioned, staying inside the case, you are essentially trapping up the heat and restricting airflow, dissipation factors. You can do this easily by taking it out of the case and laying a top of a cool granite counter top other cool surfaces. Even just by taking it out of the case and setting it on top of the case will help. But if you want to have it done properly, a cool aluminum block like this will do a wonderful job
You can charge + play back at the same time, despite the heavy operational conditions of tubes/classAB/P+ and H-gain. If you properly dissipating the generated heat away from the N8ii!!! Essentially and mainly the Back of the player. Just lay it a top of a heat sink or a cool surface, with QC 3.0 charger and you will be safe to continuously playing+charging all day long
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