Probably insignificant compared to a 20 a day tobacco habit for instance.
(actually I could get almost the same kit together in a year for what I'm currently spending on Tesco ready-made smoothies
(I also don't take holidays)
It's an exageration really because anyone with reasonable hearing should be able to tell the difference with any reasonable off-the-shelf hifi.
As I'm sure Dub could explain far more eloquently than me :-
Different music places different demands on low-bandwidth digital formats. A lot of samples used in modern music are of a lower quality than 128k MP3 ... dubby bass is especially kind to the technology, in a side by side test I seem to remember thrashy punk was actually
preferred via MP3.
A lot of music I listen to though is very demanding on the equipment ...
I have recently digitised the first Renaissance Mix CDs for my MP3 player and I can assure you the sound from my CD player is remarkably superior to that from my Creative Live! card which feeds into the same amp and speakers.
.