Hey man, fan of your reviews and don't mean to contradict you, I think we are actually both in agreeance here as you can see in my comment above:
"I match my measurements at 1kHz and the bass also reads higher than the B2 - so when you volume match them in listening, it sounds like the lower mids are a bit more sucked out instead. If you are okay with Blessing, the Volume has slightly more prominent vocals but is actually a tad less intense around the upper-mids/lower-treble area."
Here are the graphs matched at 3kHz instead - I saw the graphs in your reviews but it does depends how you smooth them and what frequency you're sensitive to when volume matching by ear:
I agree the bass is better extended with more rumble on the Volume in my review, but the mid and upper bass are more laid-back and this is confirmed by volume-matched measurements. This contributes to less perceived warmth on the Volume which is further exacerbated by its less present lower-midrange. It is, however, a smoother sound that often has a similar overall effect but the distinction is important to note for particular readers with different sensitivities and preferences.
Something interesting to note is the impedance curve of both earphones. Higher impedance sources will apply a sub 1kHz bass boost to the Volume, by comparison, the Blessing 2 becomes brighter and leaner. I think this makes the Volume more desirable since you can easily tune up its deficits with source pairings/impedance adaptors while you don't see many calling the B2 too dark. Hope this clears up my thoughts on the matter, to reiterate, I enjoyed your review and see nothing wrong with your opinion.
Oh contradiction is never a concern at all bud!
It's always interesting to read other's impressions and preferences. I was just surprised that you felt that Volume's bass is more reserved than Blessing2's (unless you meant the other way around) because Volume has a bigger bass shelf and comes off a much bassier set
to me than Blessing2. My experience is based on what I hear but the graphs do support it - 8-9dB bass shelf of Volume vs 4-5dB bass shelf of Blessing2. That's a difference of 4-5dBs, which is not minor at all! All my DAPs have extremely low output impedance, so I perceive a 9dB bass shelf in Volume, not more.
In case of graphs, I hardly ever apply smoothing to graphs unless absolutely required. That is why you see my graph lines wavy in the sub-bass in the graphs below. Even if I have to, I mostly use the lowest setting - 1/48, which does the bare minimum. I generally match at 1kHz or 500Hz (unless required for a specific reason to demonstrate a fair comparison between IEMs tuned worlds apart). Plus, I generally always align the alignment frequency to 60dB to keep stuff even more consistent.
I know you already know this but I thought I'll write this for people who don't measure and should know - Comparison graphs can be made to look very different if you align them at the wrong places and can sometimes be difficult to read if you don't align them at all. IMO, since these 2 have a similar tuning philosophy (VDSF target which is Harman Target inspired), it is much easier to compare their graphs than IEMs that are tuned worlds apart. Since the common elements between Volume and Blessing2 are a flat lower-midrange and pinna gain rise at the same frequency, 1kHz, it is better to align them at 1kHz or 500Hz for a proper comparison, which you see most graph guys generally doing anyway. Also, since they have a similar bass shelf, which is boosted at the same frequency and have a similar Q-factor, just different gain levels (4-5dB vs 8-9dB), a comparison between them is even easier. You could even align them around 400Hz, 300Hz, 200Hz or 100Hz (bass shelf's boost frequency) and the graph comparison would look more or less the same since those frequencies graph similarly between both IEMs. All shown below....
Again, I perceive more mid-bass (62Hz-125Hz) in Volume than Blessing2 and that's again by what I hear, not by looking at a graph. But the graph comparisons do confirm it too.
Now for example, if one really wanted to make it look like Blessing2's treble is much brighter or that it has more mid-bass and upper-bass, I'd align them to something like 40Hz,
but that would be wrong since Volume has the bigger bass shelf and the bass shelf gain level isn't the same between them.
At the end, what matters is how you hear them and I perceive Volume being bassier, with a bigger bass shelf, where both its sub-bass rumble and mid-bass punch are more than Blessing2's. So well, if anyone hears Volume's bass being more reserved (less in quantity) than Blessing2's, then I guess I should say - YMDV = Your Mileage Definitely Varies.