The only time I use loudness is when I am playing music as back ground music during dinner or serving drinks during polite conversation. Thats with the music at or below 50 db levels which really quiet. Your ears sensitivity to bass at those levels is more than 20 to 25 db below the 2 kHz octave band where the ear is most sensitive.
You're going through Audio Puberty. You'll also start to like the alluring pops and crackles of vinyl surface noise. The worst thing, though, is the acne.Are my ears changing? Is my brain changing? Is my hearing changing? Is my equipment changing?
I used to think that without loudness, everything sounded anemic, with loudness everything sounds perfect. Now....loudness makes everything sound bloated and woofy. Without loudness it sounds right. Same gear, same recordings, same rooms.
This change was gradual, not overnight.
Thoughts?
Once I got away from mid-fi, I realized I no longer needed it. I think in my case, it might have been tendency to listen slightly louder, and I am not using it for low-level background music anymore either. (I have a small tubed system on my work/computer desk.) The floor-standing speakers I own now also tend towards the warmer side of things, so at lower levels they don't thin out like other speakers I have used.Are my ears changing? Is my brain changing? Is my hearing changing? Is my equipment changing?
I used to think that without loudness, everything sounded anemic, with loudness everything sounds perfect. Now....loudness makes everything sound bloated and woofy. Without loudness it sounds right. Same gear, same recordings, same rooms.

You should post that question in the tape category about the potentiometer. Someone may have the answer you seek.Once I got away from mid-fi, I realized I no longer needed it. I think in my case, it might have been tendency to listen slightly louder, and I am not using it for low-level background music anymore either. (I have a small tubed system on my work/computer desk.) The floor-standing speakers I own now also tend towards the warmer side of things, so at lower levels they don't thin out like other speakers I have used.
Although I had this cool trick for really late night listening, back when I had a lesser preamp. I own a dbx 118:
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Dynamic range expanders are wretched sounding, but....what about the "Compress" side of the knob? It's perfect to level out the volume of music when listening at super-low levels, and that is what I bought it for. I had a newer model, a 1bx-ds, but unfortunately I bought it dirt cheap needing repair, and nobody has ever been able to determine the type of it needs (linear vs. logarithmic) to replace the one that is missing. (I have the value, 100kΩ, but it makes no mention of the type.) I kept it in a tape monitor loop on my old preamp so I could cut it out of the path completely.
I too have come to not use a loudness anymore either.Then again loudness equipped stereos are not part of my main systems anymore but I had started to not use it anymore.It just started to sound muddy to me at times but not always.

theory: Analog signal power amplification needed a feature that would enhance the loss or cutoff frequencies at lower volumes of play, ergo.. the "loudness" button/toggle. Modern amps, processing mostly digital signals do not have to compensate for such a loss given the amplitude is more consistent across the bandwidth.
on an audio planet, far.. far.. away. A veteran audiologist mentored me in the following considering "pure audio" and components. He said, the greater the manipulation of the original signal to be reproduced, by said component.. the increase for "coloring" of the original signal or for that matter reproduced sound. I distinctly remember his components, which he had an extaordinary setup of individual "stuff", I can not recall to identify BUT each had or was limited to a on/off, indicator, and single button/rotary controller. Fletcher/Munson response is a physiological response, not electrical/digital.You certainly made a point that is most notable.."Then again loudness equipped stereos are not part of my main systems".. and this is true for most newer systems that lean more towards detent controlled volume and digitally fed amplification. The "loudness" feature is non existent
Mytheory: Analog signal power amplification needed a feature that would enhance the loss or cutoff frequencies at lower volumes of play, ergo.. the "loudness" button/toggle. Modern amps, processing mostly digital signals do not have to compensate for such a loss given the amplitude is more consistent across the bandwidth.
Also, note the difference in facial property used for the modern amp over "vintage". The older designs were chock full of switches, manipulating signal and gain, this seems to be non trending in modern audio equipment.
Sometime ago..on an audio planet, far.. far.. away. A veteran audiologist mentored me in the following considering "pure audio" and components. He said, the greater the manipulation of the original signal to be reproduced, by said component.. the increase for "coloring" of the original signal or for that matter reproduced sound. I distinctly remember his components, which he had an extaordinary setup of individual "stuff", I can not recall to identify BUT each had or was limited to a on/off, indicator, and single button/rotary controller.
The sound.. of which he preferred classical was always.. OUTSTANDING!