Well, not just the source but everything matters. Everything. It is literally endless. Just for starters consider that your speakers are "hot-rodded" which means someone figured out that to get the most out of those speakers you first need to change the speakers themselves! Internal wiring, discrete component selection (better caps, etc) on and on. Speaker cables, interconnects, power cords, fuses, cones- on and on.
Do enough of these and your speakers will be sounding so much better you may eventually come around to understand that when it comes to getting great sound the speakers are no more important than anything else. They just happen to be the last link in the chain.
In terms of the best least compressed source though I think its pretty obviously the direct to disc LP. With direct to disc the signal goes directly from the microphones through a mixer to the cutter. Not a lot are made because its so difficult. Not many recording studios adjacent to cutters. Each side must be cut beginning to end complete. Not a lot of performers these days capable of playing 20 straight minutes. If its more than one song they have to physically play however many songs one after the other, no stopping, there is no "Pause" when cutting vinyl.
So the music selection can leave a lot to be desired. But hunt around, check out Sheffield (they did a lot) and when you find one it will not take long for you to appreciate what I'm talking about.
Do enough of these and your speakers will be sounding so much better you may eventually come around to understand that when it comes to getting great sound the speakers are no more important than anything else. They just happen to be the last link in the chain.
In terms of the best least compressed source though I think its pretty obviously the direct to disc LP. With direct to disc the signal goes directly from the microphones through a mixer to the cutter. Not a lot are made because its so difficult. Not many recording studios adjacent to cutters. Each side must be cut beginning to end complete. Not a lot of performers these days capable of playing 20 straight minutes. If its more than one song they have to physically play however many songs one after the other, no stopping, there is no "Pause" when cutting vinyl.
So the music selection can leave a lot to be desired. But hunt around, check out Sheffield (they did a lot) and when you find one it will not take long for you to appreciate what I'm talking about.