i've never used wadia cd player but i know that it has digital volume control that degrades the sound on lower volume levels. you can use an external passive volume control(or passive preamp) and use fixed output with much better results if your rest of electronics are compatible with passive preamp.
the regular electronic preamp will bring you less headache in terms of figuring out and matching.
the regular electronic preamp will bring you less headache in terms of figuring out and matching.