veiled sound? Re: Pink Floyd CDs

Ok, I just got a cpoy of Pink Floyd Dark Side & Animals, put them in the ARC CD 3 and they sounded compressed and veiled, I checked and they were an issue from Argentina! So with that I used my Ultrabit on them to see if it would help some.... still no where what I expected the presentation is still quite compressed (Dark Side) and both have a veiled or hazy quality about them, should I buy new U.S. issued copies or is this just the way they sound from the origional mastering?