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Disclosure: I am creating this continuing thread in order to help users to better utilizing their N8ii and it features. I don’t know everything about it, and so this is a thread where everyone can contribute. Please keep it useful and don’t start trolling or bashing. If you have found a new trick or a great way to use the N8ii, please post up.
Congratulation on purchasing a DAP that I would call an engineering marvel Where physics are challenged.
First and foremost, thank you @CayinSupport for being enthusiastic about Portable audiophile, and that you challenged physics to bring to us an amazing N8ii. Hopefully you keep on innovating and bringing in more for future products, and not be discouraged because with challenging physics, you will be challenged by the complains as well.

Charging tips: The stock usb cables is recommended for Data transferring only (some charger has rapid charging complications with it) . I recommend looking for an official Apple type C-C usb charging , and Apple 29-30W official charger. If you don’t use Apple much, I still recommend it. After all, spending this much on a DAP, a charger and a cables shouldn’t be a problem. Then Anker 30W or higher With QC3.0
The N8ii has 10,000mAH battery, and while it seems slow to charge even with rapid charge enabled. Please do understand that it charges relatively super fast for such humongous battery
People don’t typically charge and play simultaneously, unless they are rushing the burn-in scenarios, which I don’t recommend at all. But if you must and you do want to do so. Please be cautious, the N8ii challenge physics but not defying it. Therefore, it will generate heats, and at a certain point, your N8ii will stop charging. Under this case scenarios, please take your N8ii out of the case, and put it on a cool surface, or an open air space to help it cool down. With adequate cooling and the safety measure being met, the N8ii Will charge rapidly and play simultaneously

The coolest operation mode: the N8ii is already a great player with just Class AB, Solid State, Low gain, and P power mode. This will be the coolest operation, and also the one that last the longest of up to 12 hours, depends on your file quality. Every other additional features will generate heats, which you have no problem for listening to it with the Case on. Even staying inside your pocket. This is the recommended mode if you must take your N8ii on the go, inside your pocket or backpack.
The hottest operation mode: this is Tube, Class A, P mode, High-gain. Under this mode, and any other modes beside the coolest operation mode. I recommend using N8ii only in the opened air space, on a cool surface, and out of it case, or only short sessions of couple hours (this must be a very common use case scenarios).
Line out features:
The N8ii has amazing Line out feature that is from Balanced 4.4mm and 3.5mm. It will answer all need and desires for balanced connection or single ended alike. The LO 3.5mm is simply plug and play, while 4.4mm will share with phone out. You will need to drop down the android menu, and access it. The Line out is the most amazing feature from N8ii. Because it has Excellent implementations of digital processing + DAC in such a small package. Keeping it short, it is desktop level for both Analog Line out or USB digital Host (transport)

USB Host/Transport
You will need a USB Type C - OTG cables from the N8ii end, then the other end for whatever your DAC requires, usually is Type B 2.0
I configured it this way and using it with my desktop systems, such as Sony TA-ZH1ES. The reason why I am using it this way is because the TAZ is Sony proprietary S-Master, so only Sony has it. From time to time, I enjoy different signatures from different systems. Don’t we all ?
Under this mode, the N8ii can last upto 60 hours. Thank to the 10,000mAh battery and amazing engineering from Cayin. It also has crazy good usb digital out performances
you can edit the drop down menu and including the “veritable flip feature”. You may also need vertical rotation lock in setting. Simply swiping down and you can flip the screen upside down to use it elegantly.

Congratulation on purchasing a DAP that I would call an engineering marvel Where physics are challenged.
First and foremost, thank you @CayinSupport for being enthusiastic about Portable audiophile, and that you challenged physics to bring to us an amazing N8ii. Hopefully you keep on innovating and bringing in more for future products, and not be discouraged because with challenging physics, you will be challenged by the complains as well.

Charging tips: The stock usb cables is recommended for Data transferring only (some charger has rapid charging complications with it) . I recommend looking for an official Apple type C-C usb charging , and Apple 29-30W official charger. If you don’t use Apple much, I still recommend it. After all, spending this much on a DAP, a charger and a cables shouldn’t be a problem. Then Anker 30W or higher With QC3.0
The N8ii has 10,000mAH battery, and while it seems slow to charge even with rapid charge enabled. Please do understand that it charges relatively super fast for such humongous battery
People don’t typically charge and play simultaneously, unless they are rushing the burn-in scenarios, which I don’t recommend at all. But if you must and you do want to do so. Please be cautious, the N8ii challenge physics but not defying it. Therefore, it will generate heats, and at a certain point, your N8ii will stop charging. Under this case scenarios, please take your N8ii out of the case, and put it on a cool surface, or an open air space to help it cool down. With adequate cooling and the safety measure being met, the N8ii Will charge rapidly and play simultaneously

The coolest operation mode: the N8ii is already a great player with just Class AB, Solid State, Low gain, and P power mode. This will be the coolest operation, and also the one that last the longest of up to 12 hours, depends on your file quality. Every other additional features will generate heats, which you have no problem for listening to it with the Case on. Even staying inside your pocket. This is the recommended mode if you must take your N8ii on the go, inside your pocket or backpack.
The hottest operation mode: this is Tube, Class A, P mode, High-gain. Under this mode, and any other modes beside the coolest operation mode. I recommend using N8ii only in the opened air space, on a cool surface, and out of it case, or only short sessions of couple hours (this must be a very common use case scenarios).
Line out features:
The N8ii has amazing Line out feature that is from Balanced 4.4mm and 3.5mm. It will answer all need and desires for balanced connection or single ended alike. The LO 3.5mm is simply plug and play, while 4.4mm will share with phone out. You will need to drop down the android menu, and access it. The Line out is the most amazing feature from N8ii. Because it has Excellent implementations of digital processing + DAC in such a small package. Keeping it short, it is desktop level for both Analog Line out or USB digital Host (transport)

USB Host/Transport
You will need a USB Type C - OTG cables from the N8ii end, then the other end for whatever your DAC requires, usually is Type B 2.0
I configured it this way and using it with my desktop systems, such as Sony TA-ZH1ES. The reason why I am using it this way is because the TAZ is Sony proprietary S-Master, so only Sony has it. From time to time, I enjoy different signatures from different systems. Don’t we all ?
Under this mode, the N8ii can last upto 60 hours. Thank to the 10,000mAh battery and amazing engineering from Cayin. It also has crazy good usb digital out performances
you can edit the drop down menu and including the “veritable flip feature”. You may also need vertical rotation lock in setting. Simply swiping down and you can flip the screen upside down to use it elegantly.

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