Thank you for the tip on the Sennheiser plot. I’ll have a look at that as well, and see where it lands. Per some of your remarks in the review, I wonder if the ANC makes the measurements more difficult, or prone to variances.
Were any of your samples closer to the SG result though?
Seperate gain controls, or a simple left-right stereo balance adjustment might be sufficient to fix most of the channel imbalance on your graph. Maybe the HDB 630 app has somethin simple like that, if it doesn’t include separate EQ’s for each channel.