This 6-band setting from V2 sounds much better than V1. Is V1 actually more suitable for other earphones rather than isine20? Also one thing I do not understand is that why is dropping filter 10 instead of filter 6 a better choice? It seems that filter 10 is more important because it has a larger value of gain (5.39 db), but using filter 6 (1.5 db gain) instead of filter 10 does sound better.
V1 was desinged for iSine10/Lx while v2 was for iSine20
The filter 10 affects air frequencies while the 6 affects upper mids/lower treble. Assuming most iSine10/20 users are above the age of 30, one is more likely to be sensitive to upper-mids than the air frequency. But there is no right or wrong, you can use either and also adjust the gain to see what suits you better.
Being an open headphone, it also depends on where you use it. If you are on a walk or not a very quite place, boosting the bass and upper mids will have more benefit than boosting the air frequencies The later is more likely to be less important under noisy conditions.
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