I have a Marantz SA-14 (SACD/CD player) that is used with a 1995 vintage McCormack DNA-1 Deluxe. I switched last year to the "custom" setting and experienced nothing but improved sound. I, too, had the same apprehension about changing the filter setting. I run the CD player thru a C-J Premier LS17-2 preamp. Recently, I had the amp upgraded by SMc to the Gold Plus level. The entire system is fantastic. I don't think there should be any problem with a quality amplifier. Good luck.