I have Arcam FMJ A19 amp Arcam FML CD17, but wanted to create playlist for dinner part, BBQ etc. rather than hopping up & down to change CDs. The Arcam rPAC DAC was brought to my attention, and having good reviews I thought it might be an inexpensive way to trial the idea. Simple to install, I did treat it to a better quality USB lead & interconnects than the ones supplied in the box ( I had them spare anyway) First off was to run it with my MacBook Pro utilising albums I had already ripped onto iTunes, using the original iTune settings. It was OK, a bit thin, but then I learnt that the preset was AAC ( a compressed format) & I had the option to rip in Apple Lossless format, which I did. The result was a whole lot better. However as a basis for a permanent digital source I took a discarded Dell Studio laptop (Windows through the window!) , and on recommendation, installed jRiver Media suite as opposed to iTunes. Then I ripped a reference CD on jRiver, being the same as iTunes AAC, and Apple Lossless. The final result was astonishingly good. I might tell the difference to my CD player if I sat and listened very hard, but it would not be easy. Note you only get out what you put in. Mp3 would never sound as good. But CDs ripped on Lossless format, and in my case on jRiver, gave a brilliant result. Just one thing with these small DACS, it seems. You have to turn the volume up a bit compared to CD Player. That's it. The supplier Nintronics were faultless. Highly recommend this product. Don't be put off by the low price. Chances are if you buy a much more expensive DAC, you will have to uprate your whole system to get the benefit.