...Downloading and playing the WAV file thru to BeyerDynamic 990’s, the difference is more obvious and I definitely prefer the more “glued together” and warmer consistent sound of the Finalizer. The DP24 section sounds a little harsh in comparison.
J, going in a different direction for a moment:
What you're hearing is a random function of the frequency response of your DT 990 cans, which have a slight "smiley face" curve (see links to charts below ).
This is only a very minor concern, but even so it
can influence how a recording is mixed, and how other recordings sound when auditioned.
When mixing, unless you're aware of how this headphone's frequency response impacts the mix, there would be a tendency to undermix the low end fundamentals by about 3 dB, which of course also impacts the harmonics.
Conversely, when auditioning previously recorded material, it tends to emphasize randomly in minor ways the various segments of the low end and harmonics, depending on the complexity of the audio frequencies at any given point in the recording.
That's why it's always a good idea when possible/feasible/affordable to mix and master using good speakers augmented by good headphones; and also to use different headphones and speakers for each process.
But as long as you're aware of how individual speakers and headphones affect the sound, you can compensate for it.
Frequency Response DT 990 Pro
verses
Frequency Response DT 880 Pro
Note
Some high end boost (typically in the 3kHz-6kHz range of the spectrum) is normal for high quality headphones (has to do with ear coupling issues - beyond the scope of this forum) and actually translates to the human ear as a neutral to slightly bright high end depending where it occurs and how much boost it has.
Anything beyond 10k is meaningless in headphone measurements (having to do with inability of test gear to obtain accurate measurements, again due to ear coupling issues).