Using a good digital cable is very important. Most of the DACs that I tired in my system made a difference over the stock players. There are many different DACs and they all have a sound. You need to pick one that you like in your system. There are plenty used on Audiogon that you can buy and resell for about what you pay for. Tube vs solid state is your first decision and then the amount you want to spend to get better sound.
Happy Listening.
Happy Listening.