If you have a stereo set-up at home, you’ll know that there’s a special input for your turntable labelled “phono.” You can’t just plug it into, say, an auxiliary input. If you can use an aux input for everything else, why not your turntable?
Because in order to play back vinyl correctly, it has to go through something called a “phono stage.” Vinyl has limitations when it comes to storing very low frequencies and very high ones. To counteract that, records are pressed with the bass turned down and the treble turned up per something called the RIAA equalization curve. Upon playback, the phono stage reverses that curve, boosting the bass by a specific amount and reducing the treble, thereby achieving the tonal balance of the original recording.
The RIAA curve may help explain why it feels better to listen to vinyl than a digital recording.
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