I believe I have not made many mistakes because I have done my homework prior to each upgrade, first reading professional journals on equipment within my means, then carefully auditioning the equipment. I always looked at compatibility by comparing specifications and published measurements even though I believe the latter is not that useful because they are most often taken in an anechoic chamber and not a real life environment. As technology improved over the years, and my spend increased, every system improvement produced noticeable SQ improvements. I did make one setup error when I first moved from a PC server to an Aurender. The combined voltage output of the server and DAC overload the input of the preamp causing clipping distortion. It took me a while to research the problem, blaming the Aurender at first My quality engineering background told me to tolerance stack the specification and I found the problem which was easily solved by lowering the voltage output of the DAC. Also, I do not make system changes often. I become comfortable with my system and enjoy the music. One professional reviewer whose name and journal I do not remember stated some audiophiles have the FOMO (fear of missing out). While I know better is out there, I am happy where my system stands and I do not suffer the FOMO