I would have guessed it isn't the cable making the sound "warmer" but reducing distortion caused by noise entering the Mojo, which we are more sensitive to in the treble. Quote: Wrong cable I'd bet. You need one that is terminated in a 3.5mm TS plug, which looks like a mono version of a regular headphone plug. Looks like up-sampling mode in HF Player, which is advised against for the Mojo. The DSD up-sampling mode is good with Sabre-based DACs, because it bypasses their rather lacklustre filters, but unnecessary in the Mojo which has a completely different system. What DAP do you have? I don't know of any with a USB output.