Amp circuit production circuit diagram

1. Is it suitable for pushing low resistance headphones? My headphone impedance is 60 ohms.
2. What is the sound characteristics?
3. The input and output of the headphones on the circuit diagram are two channels, but my mp3 and headphones have only one plug, how can I split the two channels, is it necessary to buy the audio fork? I saw some of the physical and electrical diagrams of the ear room. This problem has not been clarified.
4. How is the ground in the circuit diagram implemented, that is, where is the ground in the actual circuit. It seems that the picture is supplied by the sound source. I don't know if it is right. Anyway, I am confused (meaning is not clear, I don’t know if everyone can understand)
5. This circuit is enough to need to add a DC blocking capacitor at the output. Is it in series with the 47ohm resistor at the output?