I've tried a multitude of headphones since getting into the hobby at the beginning of this year. I love soundstage in headphones, though not at the cost of imaging, and was wondering about the science behind angled drivers in relation to the ear cup housing. Context: after trying the HD569, M50x, MSR7, and M40x, which are all angled drivers, to me they seem to have much less soundstage width than the DT770s, AKG K550, and B&O H6 that I tried, which don't have angled drivers. The MSR7 in particular I think has just as precise left to right imaging as the DT770, but it feels congested like the individual instruments are in a tiny room. With open headphones however, my experience is a bit different. The non-angled HE400s and AKG K240 that I tried definitely aren't as wide as something like an HD598 / 558, the latter example being angled. I did a comparison of the AKG K240 in particular (since they're my pair, the he400s my friend's) by putting Angled HM5 Velour pads on them and heard a noticeable change in width (as well as imaging) for the better just by angling the driver with angled pads. However, I haven't tried the DT880 or 990, nor the HD600. I know the former don't have angled drivers but are known to be extremely wide, and the HD600 is supposed to be less wide, though I'm not certain of the driver positioning. Is there a definitive way of creating soundstage with driver housing / positioning, or are my examples more a result of frequency response?