I like Blindjim's post. In my own system, the analog and digital sources represent the most expensive components by a clear margin but not an overwhelming one. That's just the way it worked out, but I do recall listening with less good sources in the system at times. It was easy to hear their deficiencies.
If you want to know if source improvements will make a difference, try Blindjim's suggestion and swap in a new power cord, some good footers ( try Herbie's Audio Lab ) or an isolation transformer. You can use these items on a new player if and when you get one, or resell without losing much if they turn out to have no effect. IME, though, they do work, and well enough to be considered indispensable.
If you want to know if source improvements will make a difference, try Blindjim's suggestion and swap in a new power cord, some good footers ( try Herbie's Audio Lab ) or an isolation transformer. You can use these items on a new player if and when you get one, or resell without losing much if they turn out to have no effect. IME, though, they do work, and well enough to be considered indispensable.