I did the comparison between CA 640 V2 and 840. The system consisted of CA 840A integrated amp and I connected AKG K601 headphones to this amp. Both CDPs were connected at the same time and I was listening to the same discs running in both players in the same time. Then I switched between two inputs to hear the difference.
And I didn't heard any ... to be honest. It was big disappointment having in mind the technology built into CA 840. And 840 costs about twice as much as 640 V2. It may be that 840A is not good enough to show the differences, but it should be ... AKGs are excellent headphones and they are certainly not the reason for this disappointment.
Anyway, the only player that I heard until 1000 euro mark that does make a difference is Naim CD 5i.
And I didn't heard any ... to be honest. It was big disappointment having in mind the technology built into CA 840. And 840 costs about twice as much as 640 V2. It may be that 840A is not good enough to show the differences, but it should be ... AKGs are excellent headphones and they are certainly not the reason for this disappointment.
Anyway, the only player that I heard until 1000 euro mark that does make a difference is Naim CD 5i.