It's not a matter of how much power, but what quality of power. Yes, you can drive the speakers with the Adcom, but it will be an entirely different experience with a more robust amp.
To the question: I used the CAL Alpha DAC a while back, and to my ear most all the new players have quite a bit more resolution, several of them would sound more "forward". If you are not accustomed to this, I'm guessing it will be unpleasant. I haven't taken the time to check on the specs, but if the CAL player has a digital out, you may have two channels available to run to a tube DAC. This might serve you very well. An econonmical one which I reviewed and has beautiful tonality is the Monarchy NM-24. There are many other decent DACs which might work. You could borrow one and see if the dig coax output of the player is intact. Might save you a lot of money.
To the question: I used the CAL Alpha DAC a while back, and to my ear most all the new players have quite a bit more resolution, several of them would sound more "forward". If you are not accustomed to this, I'm guessing it will be unpleasant. I haven't taken the time to check on the specs, but if the CAL player has a digital out, you may have two channels available to run to a tube DAC. This might serve you very well. An econonmical one which I reviewed and has beautiful tonality is the Monarchy NM-24. There are many other decent DACs which might work. You could borrow one and see if the dig coax output of the player is intact. Might save you a lot of money.