Going back 40 years, I have been replacing hard wired factory power cords with larger gauge wire on 100's of amplifiers ( such as Marantz model 15, Citation 12 and 16a, Phase Linear 400, SAE 2200, Nad 3020, Rotel RB850 or a Soundcraftsmen A400, CJ Premier 12, Yamaha P2050, just to name a few ). The new cable was from either Carol or Southwire, 12 gauge, unshielded, with standard Wattgate plugs. Nothing fancy. Tremendous improvement in sq, in every instance. Did it on everything, including preamplifiers, cd players, tuners, equalizers, etc, with great improvements in sq. Were all of these products produced with poorly designed power supplies ? I doubt it. Personally, I was not a fan of IEC inlets when they started showing up on gear, as I believed, and still do, hard wiring to be a superior connection, but I do understand, and have adapted to the iec standard. Power cables make a difference, and hearing is believing......Enjoy ! MrD.