ALPS rk27, 100K volume control, with switchable loudness KitAmp

Loudness Button On Amplifier. The loudness button PS Audio This is designed to compensate for the changes in human hearing sensitivity at different volume levels Loudness buttons seemed to largely disappear as amps and receivers begin to feature equalizers and later sound programs

This is achieved by level/voltage sensing of the pre-amp's output to gradually reduce the bass and treble boost as the volume increases We kept the 'loudness' button pressed because we liked how it sounded in my experience as a kid

Amplifier "Loudness" Compensation Circuit Experiment YouTube

The purpose of the loudness button is because the "frequency response" of our ears isn't the same at low listening levels as it is at higher listening levels (Google "equal loudness curves") The Loudness feature on Yamaha stereo amplifiers is essentially a form of volume-dependent equalization It's to do with Fletcher-Munson and the ear's sensitivity changes at very low playback volume levels

Amplifier "Loudness" Compensation Circuit Experiment YouTube. The higher the volume control, the lower the bass and treble boost until the loudness circuit is removed from the signal path altogether Back in the 70's and 80's I used the loudness button on my early 70's Pioneer and late 70's Sansui receivers at lower volume levels to boost bass and (to a lesser degree) treble.

Passive stereo tone control w/ loudness button assembled low distortion ! JIMS Audio. This is designed to compensate for the changes in human hearing sensitivity at different volume levels That was a result of having crappy stereo equipment tho.