In the past 2 years, I was focus on the vintage multibit DAC (Digital to Analog Converter). I think all popular vintage multibit DAC IC has been use in my DAC project built. Those built are various in many different approach for each DAC section, solely to find what is the best variation among them. I really like the sound characteristic coming from the vintage multibit DAC. For the example a complete audio system can be optimized in the sound quality by using a better source (media player). This what I found when I was a kid playing around making my own amplifier and speakers but when the same setups are using, and then I only changed the source from cassette tape to CD player, the sound quality was improving so much. The reason was because of the CD player specification are far superior than cassette tape. That finding was shocking me and then I keep continue to do the audition from many kind CD player that they are actually sound different one to another. Lately I was aware that the...