Excuse me but is the cd player the only change you've made? Are you the only person who hears the nastiness or is it identifiable by someone who isn't an audio enthusiast? If so, that is where I would suspect the problem lies. If you are dissatisfied with the cdp you should return it for another, and don't let the dealer sell you an integrated amp you don't want.
If I make a change to my system and things get worse instead of better I look elswhere. The suggestions on room treatment are good advice only if the room permits. I also understand this particular cdp is popular amongst Audiogoners but if it doesn't work for you, it doesn't work. If your intention is to get better sound from cds and you intend to build you entire system around this cdp, keep it. If not, look for something more suitable to your ears.
If I make a change to my system and things get worse instead of better I look elswhere. The suggestions on room treatment are good advice only if the room permits. I also understand this particular cdp is popular amongst Audiogoners but if it doesn't work for you, it doesn't work. If your intention is to get better sound from cds and you intend to build you entire system around this cdp, keep it. If not, look for something more suitable to your ears.