1. MP3 files from flash
--> 2. Decoding MP3 to WAV by the processor
--> 3. Now WAV is gonna go through DAC, which turns the digital WAV to analog audio stream
--> 4. the stream goes through op-amp (Can be output from LO jack)
--->5. through headphone amp inside the MP3 Player(out from PO jack)
Is that right ? OR some missing point/process exists?
BTW, I heard the term pre-amp, post-amp. What roles do they play in the process?
Plus, is the headphone amp we usually talk about a pre-amp, post-amp, OR integrated model for both?