The ripping procedure you use is not the problem. I have both a MAC and PC and listen to Apple Lossless and WMA Lossless. Both formats work very well with my Crimson.
I have not heard the AMR CD player, but if you are looking for something to be SOTA, look at Gordon's Crimson. The Cosecant is a wonderful DAC, but there is better.
I have not heard the AMR CD player, but if you are looking for something to be SOTA, look at Gordon's Crimson. The Cosecant is a wonderful DAC, but there is better.