Thanks for this!!!
Although I have 2 different enhancing discs XLO and Isotek, I have been negligent to use them. 3 days ago I reinstalled my Marantz HDCD 1 and while it sounded appreciably better than my Oppo 105 with upgraded PS (though also unenhanced in a long time), the HDCD 1 was sizzly on top. First I replaced the $250 WW power cord with a ~$750 PC from Tekline. That helped, but the images were still a little fuzzy. I put my XLO disc in for a complete run-through. Images were much better focused as well as location on the sound stage