Recently I've been upgrading a lot of my existing LPs to earlier pressings if I can get hold of them at a decent price. I guess the question I'm asking would really apply to vintage pressings from the 60s and 70s.
For example, one of the recent finds was Fragile by Yes. This was a 1st UK on the Plum Atlantic Labels with A1/B1 matrix. You may like to refer to a recent post about this here about that with my thoughts:viewtopic.php?f=41&t=127&start=9856
Weekend just gone, I picked up Genesis - Lamb Lies Down.. This again was an earlier press than my existing one. (Beige Mad Hatter Charisma replaced the Blue Hatter version). I noted that the replacement was also a 'Porky Prime cut'. not bad for £2 in Ex condition.
Spun this one and again could not believe what I was hearing. There were subtle instruments that I've never heard before. Guitar parts which I swear were not audible on my original copy. Vocals were way more 'up front', bass shone through.
How is this possible? It seems that so much detail is lost in later pressings. Can anyone explain why this is and how earlier copies sound so much better in so many different ways?