Tuning my system towards a darker tone

I am trying to tune my system in a darker direction; as I have a bright ( lots of glass) listening area and have been directed by my interior designer ( aka wife) not to add room treatments.  Starting with power cords, then possibly ICs would like to find a natural sounding power cord but with a darker tone.  System includes: leben cs 600 amplifier, Linn Akurate Streamer DAC, Feikert Volare TT, Luxman CD player.  Current power cords include Luna, Audio Art and Raven.  Note: my speaker cables are not in play as they are within the walls and were picked to appease building codes in our area.  My price range for cord 500-1000.
MP