Celtic66,
A music server is the ultimate way to go. But, before he can make that move, he still has the problem of a CDP playing back with a high jitter rate.
Dylanfan, In your other thread you asked the same question, "new CD or DAC?" First, forget about the Emotiva; it will never sound close to analogue. Second, $3000 will get you a very good "close to analogue" sounding CDP such as a used Ayre or ARC. Is it worth it, probably not, since you will have spent all your money and eventually you will want a DAC in your system.
Start researching DACs. I see your Marantz 6005 has a digital coax output, get a high quality coax cable for input to the DAC.