Go "borrow" a few DACS and use that instead of the internal DAC in the NAD unit and hear the difference. Same for other components and cables. Try them out in your system before you purchase. But, since you asked, my order would be:
1. Audition various external DACs.
2. Cables. They do make a significant difference in the impedence and sound.
enjoy
1. Audition various external DACs.
2. Cables. They do make a significant difference in the impedence and sound.
enjoy