Compression or recording and mastering engineer's that do not know what they are doing.
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I have noticed that artists who use an acoustic bass rather than an electric often have bass that is less prominent in the CD. This does not have to be the case. Artists like Alison Krauss and Ramsey Lewis have made the choice to use the acoustic option and many of their recordings sound very balanced. I actually prefer an acoustic bass for certain genres of music and appreciate the engineering skill necessary to get it right.