I have just tested a 2-channel DSD 256 on DMP, I buy this level of quality because you have a significant difference with a 24/192 type Qobuz, the DSD 64, it is said that it is still close to certain recordings in 24 /192, depends on who is listening. From a DSD 128 resolution, the difference is more obvious. I find the DSD 256 an interesting format, above there is the 512, longer download and large file size (I've never listened). In general, the DSD brings more fluidity in listening, very small details become perceptible, it is especially in the extension of the treble that we reach peaks without harshness, the bass is well defined, it is less obvious than for the treble. Little difference on the width and depth of the soundstage. The contours of the instruments better defined. I haven't tested the DSD 64 in 5.1 via HDMI, I'm thinking of buying one to see. In any case, in DSD, I found the DMP very transparent and of great musicality, excellent for the price of this player.