The Alpha is an update to the Complete design, but the most excellently written manual says it better. :-) I've never heard the power amps so I can't comment.
"Complete Alpha Series is YBA's latest upgrade of it's Audio Refinement range to components. Through careful selection, matching and tuning, YBA modified the original "Complete Series" to show a vast improvement on an already acclaimed design. YBA accomplished this by carefully modifying the PCB base material with higher conductivity copper, paired with a stronger dielectric. In addition, the structural resonant was further suppressed through months of tedious fine-tuning and testing. Finally, the power supply was overhauled and upgraded to higher quality silicon steel and now uses even higher purity copper wires.
Overall, YBA's skill, ingenuity, and attention to detail have advanced the performance standard of the Complete Series making the new "Complete Alpha Series" superior to it's original design, while staying true to Audio Refinement commitment to it's discerning customers and the exclusive sonic signature and musicality that is the hallmark of YBA."
