Progress update:
I tried two more experimental parametric-EQ settings, but neither of them passed muster.
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Experiment #1: Moved the 2,000 Hz band to 2,500 Hz, and changed its Q-factor from 1.0 Q to 1.3 Q. Also moved the 1,000 Hz band to 1,250 Hz, and kept its Q-factor at the default 1.0 Q.
The result: an even-wider soundstage, but too much "harshness" in the upper midrange and lower mid-treble. I guess you could call this "too much soundstage." Too fatiguing to the ears.
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Experiment #2: Only moved the 1,000 Hz band to 1,250 Hz, and changed its Q-factor from 1.0 Q to 1.3 Q.
The result: slightly-better soundstage and a better overall sound during songs' openings and verses,...but their choruses (and parts with louder, higher-pitched vocals) sounded a little too harsh and fatiguing to the ears.
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So at this point, it looks like the only parametric-EQ change that's necessary is with the lowest EQ band, as described in my previous post.
I tried two more experimental parametric-EQ settings, but neither of them passed muster.
---------------
Experiment #1: Moved the 2,000 Hz band to 2,500 Hz, and changed its Q-factor from 1.0 Q to 1.3 Q. Also moved the 1,000 Hz band to 1,250 Hz, and kept its Q-factor at the default 1.0 Q.
The result: an even-wider soundstage, but too much "harshness" in the upper midrange and lower mid-treble. I guess you could call this "too much soundstage." Too fatiguing to the ears.
----------------
Experiment #2: Only moved the 1,000 Hz band to 1,250 Hz, and changed its Q-factor from 1.0 Q to 1.3 Q.
The result: slightly-better soundstage and a better overall sound during songs' openings and verses,...but their choruses (and parts with louder, higher-pitched vocals) sounded a little too harsh and fatiguing to the ears.
----------------
So at this point, it looks like the only parametric-EQ change that's necessary is with the lowest EQ band, as described in my previous post.