I am merely sharing my views based on responses here and other threads. It was not my intention to offend or isolate anyone. @antigrunge2 and my experience with an external clock are nothing but exemplary. I must admit, implementation and choice of components (including clock cables) are the key when pursuing such ultra high resolution endeavors. For most folks, internal DAC clock would be sufficient and provide plenty of thrills. Also, whether one can hear the differences with a master clock synchronizing multiple components such as DAC, Streamer and Switches would largely depends on the downstream components.
You don’t need to take my word for it, just study the systems that are using high quality external master clock. Peace!