Playing around with power cords is something you do after you put in Mundorf sliver/gold in oil coupling caps!!! Coupling caps are directly in the signal path along as with grid stopper resistors which I had Dan put in a quad of Audio Note Tantalum resistors and a pair of Mundorf silver in oil caps. My Sony 9000 is very detailed and yet very smooth. My pre is a passive autoformer which lets through all the detail and dynamics the machine has to offer.