QUOTE(Tim_HKG @ May 5 2011, 04:18 PM)
The limitation of the source? Is it the TDA7370B, or from the sound card, the computer? So, for fun purpose as well as improvement, what else cound be done on it at this moment?
Added on May 5, 2011, 4:19 pm
Yes, S5532 is NE5532. It has a big "S" before the printed model number, and they were manufactured in the older days, someone said those older-manufactured stocks is good at sound. By the way, I have no idea of it.
Not sure about that, but most use NE5532 from Texas Instruments, which i also found to have good quality fabrication. Use a DIP8 socket so you can swap it anytime.