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Originally Posted by Paul Gold  I don't know any of this. Start with the RIAA curve. It is for maximizing SNR and recording time on the disk. |
The RIAA curve was for cutting analog records. The Bass frequencies would cause the cutting head to swing too far which would not have allowed the grooves to be close together. To fix that and to make sure that everyone's record player would reproduce the sound in the same way, the RIAA came up with a standard. Basically, after a mastering engineer got the sound right, they would pass the sound through an EQ .
Some folks (like my sister) confuse a "phono" input with "aux" inputs. Phono inputs apply the reverse of the RIAA curve to add back the correct amount of low freq.
This article explains it in a better way..
RIAA equalization - Wikipedia, the free encyclopedia