@bbarten If you think of the pop/rock albums of the 70’s in particular, they were generally played in cars on either 8-track or cassette. The speakers of the time were placed in trunks on the rear package shelf, so they emphasized the bass.
Here’s the technical reason from vintagevinylnews.
During this process, low frequencies (like bass tones) are reduced, and high frequencies (like cymbals and snares) are amplified.
This allows for narrower grooves on the record, which increases play time and reduces distortion from needle movement in lower frequency ranges.
When we play these records back on a turntable or phonograph, we need to reverse this frequency reduce high ones, and enhance low ones – so that what we hear accurately replicates the original recording.
This is precisely where an RIAA equalized preamplifier comes into play; it corrects these altered frequencies according to the standard RIAA curve.
So the gentleman above who recommended an equilizer has it exactly right. Your phono preamp is applying reverse RIAA curve, so it’s hardly heresy to jack up the bass if it suits your mood.

