Want to improve sound of Silverline Prelude II

I have the Silverline Prelude II's which are the revised version of Alan Yun's original design. I currently drive them with a Creek Classic SE5250 integrated amp (85RMS)Speaker cables are 12ft runs of Analysis Plus Oval 12; My CD is a Sonographe SD-1(20 years old CD player modified and marketed by Conrad Johnson") Interconnect is an Audio Magic Spellcaster II. Overall, the sound is clean, dynamic but somewhat bright and forward, and often digital sounding.(I currently have no turntable, but will be getting back into vinyl soon)..... I am sure some of this is the Sonographe CD player which has been flawless and provides very good sound. However, I like to take a shot at improving the overall sound, that is, making them more coherent sounding top to bottom, and a more natural presentation without making it sound like a British monitor. I have considered the following equipment moves: Rega Apollo CD and/or new speaker cable. A member recommended JPS speaker cable. I have read that a tube integrated or separates are possibly more compatible with the Preludes, but the Creek(so far) provides great low level detail and depth of staging, though lack the slam, and upper harmonics of my old setup of Aragon amp and CJ preamp. I realize the solution might be to just buy a better speaker. Previously, I had Vandersteen IC's. a good speaker for the money, and have considered the 2CE Signatures, but they might be too big for my 15x22 living room; All comments and opinions welcomed,especially from Prelude II owners. Thanks, Jim