I was talking about a specific hardware player, but in general any additional signal processing has the potential to add artefacts. To hear these sorts of thin

I was talking about a specific hardware player, but in general any additional signal processing has the potential to add artefacts. To hear these sorts of things, listen for reverb tails on drum hits, high frequency percussion like cymbals, high-hats, solo human voice (we're quite good at hearing unnatural artefacts in voices) - that sort of thing. Beware it has to be good quality source material to start with though!