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vinyl is the best. it's analogue so there is no approximation, it's precision is limited only be the quality of the record, the stylus and the turntable.
CD is next best, it has a pretty good frequency range, most people can't hear any lower or higher. the sample rate for CD is 44,100khz or 44 thousand times a second the sound is sampled.
that's pretty good, but not as good as vinyl.
MP3 and Minidisc are a distant 3rd and fourth. they use compression, which throws out some stuff to make the file smaller. it's stuff we mostly can't hear, but still, it isn't perfect. different compression rates make a difference, but, it's all compressed from something, therefore, of less quality than the source.
a small note, sometimes a CD can sound BETTER, because a CD never degrades. and when it's silent, it's SILENT, unlike a record which will always have some amount of noise from the needle on the groove.
so, CDs can sound nice and crisp, but they don't have the booming bass, and intricate frequency deviations possible on a record.
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