[nmatheis]

The ES9018 is a quite good chip when implemented correctly. If not, it can sound quite harsh. The chip doesn't tell you much, as there are many other important factors in the chain.

True that! This is my one of my favorite implementions. Sounds nice and dynamic / energetic without veering off into harsh / sharp territory.

 

[apaar123]

what is the maximum impedance for which it can give good power?

 

[apaar123]

Can anyone compare these to xduoo xd05 or oppo ha2?

 

[jodgey4]

  what is the maximum impedance for which it can give good power?

This device states 210mW output at 32 ohms. From there, you can use Power = Voltage^2/Impedance to figure out how much power it can put into other loads (it would be 1/2x the power at 2x the load).

It's not just impedance that matters, there's also sensitivity. There should be some power threads around here to explain the concept further. What headphones did you have in mind? It can probably power most portable headphones just fine.

 

[apaar123]

How does it compare to oppo ha2?

 

[HotIce]

  This device states 210mW output at 32 ohms. From there, you can use Power = Voltage^2/Impedance to figure out how much power it can put into other loads (it would be 1/2x the power at 2x the load).

 
If the device had unlimited power rails, yes.
Those devices, unless they use a boost regulator (like the E12, the iFi iDSD, ...), they are fed with the 5V of the USB, which trims the power at higher impendances pretty massively.
The 210mW at 32 Ohms tells you that they are not using a boost regulator, this is why they list power on relatively low impedances.
They can sink current to low impedance loads, but not provide voltage for higher ones.

 

[apaar123]

does it have bass boost?

 

[nmatheis]

^^^ Nope