Need an upsamler with the Audio Logic or a CDP that puts out the 24 bit signal.
Here is a link to all you ever wanted to know about the 24mxl. You will really like it.
Power cords and tubes make a big difference. There are a few threads on other's thoughts.
I am currently using Siemens 7308 gold pins and Wolff Carbon Source cords. I am very happy with the results.
Jerry Ozment is very nice guy and always available to discuss your DAC with you.