The CD/Preamp sits on top of the three shelf unit that houses the Krell amp and conditioner. To tell the truth, I don't know the model of the conditioner. When I took it in and out of the system I did hear a difference and it sounded better. It was subtle but there. I plugged the amp directly into the socket and the CD/Pre-amp into the conditioner. I don't think it was psycho-acoustic subjectivity on the part of the conditioner.
Thanks for the idea about Plinius. I am going to try and audition a Pass Labs x-250 at home as well as an Edge NL-10.