System synergy is a variable and bespoke thing.
I so far have recently migrated my entire system interconnect cables array to new CARDAS CLEAR interconnects, and upgraded to new mix of CARDAS CLEAR / CARDAS GOLDEN REFERENCE power cables.
The last missing piece (and currently a WIP) in my Yellow Brick Road to Audio Oz, is an upgrade to one of its stablemate CARDAS CLEAR or CARDAS CLEAR REFERENCE speaker cable models.