Cables to settle brightness

Cardas! If you need a lot of taming go for old used Golden Reference. I used them for decades to warm up my system. Contemporary Cardas are still warm, but not nearly to the extent. But are still excellent cables.

You will want copper as the conductor for sure. Nothing silver or silver coated. 

@w123ale Which PowerPlant did you get, and when? If it is not broken in, give it time. If you have a current hungry amp and are plugging it into the PowerPlant, unplug it and go straight from the wall. I’ve owned a few PowerPlants and had to do this every time. I’ve since moved to the Synergistic Research PowerCells (first the UEF 12 SE and now the Galileo) and those solved any brightness issues for me. 

Otherwise, cabling and component upgrade suggestions above also help.

Audioquest cables are probably the right cables for you.

PowerPlant is new—about a week—and probably has only 30 hrs on it so far actively playing. I’ll try plugging the amps into the wall.

Yeah, as @blisshifi mentioned I’d give the Power Plant more time to settle in.  It’s hard to believe a Mac and SF Olympica combo could sound bright, but I’m not familiar with their DACs so that might be something to explore as well.