First of all are we comparing apples to apples? Usually these experiments include a much more expensive turntable/arm/cartridge. Another question is what source is the system based on. There is a difference paticularly in high frequency information between vinyl and CD therefore system assembly plays a crucial role in the end result.
One advantage vinyl has over digital is the signal remains analog. Did anyone see the movie "The Fly"? Jeff Goldbloom cuts a steak in half and sends half of the steak through his invention where the steak is taken apart and reassembled in another location. After cooking both pieces of steak it became very obvious the steak that was taken apart and reassembled did not taste quite right. Could this be the problem with some CD players?
One advantage vinyl has over digital is the signal remains analog. Did anyone see the movie "The Fly"? Jeff Goldbloom cuts a steak in half and sends half of the steak through his invention where the steak is taken apart and reassembled in another location. After cooking both pieces of steak it became very obvious the steak that was taken apart and reassembled did not taste quite right. Could this be the problem with some CD players?