'Loudness' is the stupidest name it could have been given, which is why it is misunderstood, then misused.
Leaving Loudness ON, at normal listening levels:
is the OPPOSITE of it's intended use, which is to BOOST Bass, for LOW LISTENING LEVELS, Progressive Boost with Diminishing Volume.
Because: our ability to hear bass relative to mids is progressively reduced at low volumes (equal at normal volumes).
https://en.wikipedia.org/wiki/Equal-loudness_contour
So, you are leaving it ON, finding it Bass Heavy, then turning the Bass Down. Creating and Solving A Problem.
I suggest, at normal listening volume, you turn Loudness OFF, and put your BASS Tone Control back to neutral. Then, use only the tone controls if you feel the frequency response needs a slight adjustment IN YOUR SPACE.
Afterall, the speaker maker's design for an imaginary average room, not your particular space. Vintage designs included L-Pads for frequency refinement, 1/2 attenuation the default, then boost for dead rooms or cut for live rooms, and your personal taste which is probably related to your hearing as well as your space.
Leaving Loudness ON, at normal listening levels:
is the OPPOSITE of it's intended use, which is to BOOST Bass, for LOW LISTENING LEVELS, Progressive Boost with Diminishing Volume.
Because: our ability to hear bass relative to mids is progressively reduced at low volumes (equal at normal volumes).
https://en.wikipedia.org/wiki/Equal-loudness_contour
So, you are leaving it ON, finding it Bass Heavy, then turning the Bass Down. Creating and Solving A Problem.
I suggest, at normal listening volume, you turn Loudness OFF, and put your BASS Tone Control back to neutral. Then, use only the tone controls if you feel the frequency response needs a slight adjustment IN YOUR SPACE.
Afterall, the speaker maker's design for an imaginary average room, not your particular space. Vintage designs included L-Pads for frequency refinement, 1/2 attenuation the default, then boost for dead rooms or cut for live rooms, and your personal taste which is probably related to your hearing as well as your space.