You will discover that for a budget CD player, the Onkyo 7030 is very sensitive to the cables used. I use the Onkyo in system that has an Outlaw RR2150 receiver and Totem Mites speakers.
I initially tried both Better Cables Silver Serpent and the Signal Cable Analog One interconnects and wanted to ditch the CD player. At that point, I had been using the Onkyo for about 50 hours or so. The sound was fairly bland ... not involving, no detail, female voices were harsh. I swapped in a set of Audioquest Black Mamba II cables that are sold by Audio Advisor. The Onkyo really came to life. The Black Mamba are copper wires with silver RCA plugs.
For speaker cables, I have used the QED Silver Anniversary happily for at least six years now.
Rich