1st upgrade was an economy priced Kimber Kablel USB, then upgraded to the silver coated copper Wireworld Platinum 8, .6m, for $325 purchased through Perrotta Consulting. Noticeable difference as soon as it was plugged in. Also upgraded the RCA interconnects from Morrow Audio economy model to the Wireworld Silver Eclipse. Again a cleaner sound with more detail . Next, upgraded the Luxman DAC and Integrated Amp power cords with Wireworld Power cords, no noticeable difference I could hear.