There are too many variables in cable design and your system, that will affect the sound notcieably, so any general statements about silver or copper would be deemed worthless...
Please describe your components (including current cabling) and what your thoughts are on their sound. Perhaps you tried some other cables and have some impressions how they worked in your system. It would be useful to tell a little bit about your taste in sound attributes that you value the most. Some people are bass freaks, some want extreme reproduction of ultrasound to drive their dog away... Some just like it "hot"... All this information would give other readers a lot more clues as to what actual commercial or DIY cables might "fix" your problem, assuming it is a cable issue in the first place. Sometimes it's just a wrong component...
Please describe your components (including current cabling) and what your thoughts are on their sound. Perhaps you tried some other cables and have some impressions how they worked in your system. It would be useful to tell a little bit about your taste in sound attributes that you value the most. Some people are bass freaks, some want extreme reproduction of ultrasound to drive their dog away... Some just like it "hot"... All this information would give other readers a lot more clues as to what actual commercial or DIY cables might "fix" your problem, assuming it is a cable issue in the first place. Sometimes it's just a wrong component...