This is still somewhat preliminary (because I need to re-check and verify all my math and plotting), but this is the difference between the AKG K371 and green curve on the above graph, which represents the average of 19 neutral-ish headphone measurements...
A flat horizontal line would indicate a perfect match to the avg. of 19 HPs on the previous graph.
Instead of plotting the left and right channels separately, I'm now averaging the two channels together to create a single overall difference curve for the headphones, based on Rtings raw FR measurements...
https://www.rtings.com/headphones/1-4/graph#1671/4011
https://www.rtings.com/headphones/1-4/graph#1671/4012
The reason is that I'm not sure how to interpret the discrepancies in amplitude between the two channels on some of Rtings raw FR plots. And don't want to give a false impression one way or another re the L/R balance on my plots. A better gauge for that is probably Rtings compensated FR graph(s)...
https://www.rtings.com/headphones/1-4/graph#1671/3992
As mentioned earlier in the thread, this headphone did seem a bit brighter on the left channel to me. And there do appear to be some slight differences in amplitude between the two channels on the above Rtings compensated FR plot which could possibly account for some of that. As I've stated before though, I have more hearing loss in my right ear, esp. in the higher frequencies, so all HPs sound a bit brighter or louder to me on the left side than on the right. So if there is an imbalance in the K371's left and right drivers, it may be quite subtle.
Because of my hearing loss though, I will tend to notice even a slight amount of emphasis on the left side, because it will shift the imaging even further to the left than normal. A slight emphasis on the right channel may also have the opposite effect, and make a pair of HPs sound a little better balanced to my ears than one with perfectly matched drivers.
The difference curve shown above in purple is fairly close to how I perceived the K371 in terms of its tonal balance though, when listening to them recently at Guitar Center. They seemed a bit punchy in some spots near the ends of the frequency spectrum (esp. in the treble). And a bit lacking in some warmth and boominess in the mid to upper bass. But otherwise pretty neutral.
This may be splitting hairs, but the main driver resonance in the K371's bass seemed a bit too low in frequency, leaving a little bit of a warm-ness gap between the sub-bass and midrange. And there was a bit too much brightness (and some uneveness) in some spots in the treble, which added a bit too much coloration to the sound in those areas for my taste. Based on the above plot, the brightness was mostly in the 8-10 kHz range, give or take.
There appears to be a little air missing in the upper-most frequencies as well, which might be less noticeable if there was a less pronounced peak at around 8-10k. The transition between the middle of the frequency range and the peak at around 3 kHz could also perhaps be a tad smoother. How much of these things you could actually hear is debatable though. Fwiw, the brightness in the treble, and the slight lack of warmth in the bass were probably the two features that were most apparent to me when I was listening these.
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That "flatness" in the bass and mids can be a bit hidden though by the prominence in the treble.
