beatleskid7 says:

CD’s from the early stages and now are not different at all. I do not know what you are talking about #21. All CD for Consumer use is 16-Bit 44.1kHz. That is what they are recorded at, and that is what they play back at. If it were different, the new players couldn’t play the old CD’s. Ok, and they did come out with Super CD’s and NO ONE wanted them, they where about 64 times the Sample rate, and four times the bits. As close as pure analog sound as you can get, but I guess people didn’t want to pay the price. The Problem with digital is that you can compress, but not all digital music is “Horrible” sounding. The frequencies on regular CD’s are anywhere from below 20Hz (which is the lowest freq. a human can hear) and up to 22.05kHz. (20kHz is about the highest frequency a person can hear) That is if you had great hearing. Once they are compressed cuz you want 30,000 songs on a iPod, you don’t lose the frequency, but you lose the fluent data feed. That is why it sounds really bad.