I am considewreing an ADCOM GFP 715 and a Parasound Halo P3. MY question which do you consider the better preamp? And, will either of them improve the sonic sound of a Rotel RC 1070 or 1090? I wish I had a better understanding of the comparitive value of the different components. Guess that comes with age and experience. I have the age (88) all I need is the experience? Thanks for your help and input? JNorth1178