Skipped 6xx pages... yikes. So much activity.
About 2 objective 2s wide and 2 long, not sure if that helps at all... :/
Dude, I'm talking about stuffing the area behind my speakers in my car with foam or cotton or a similar substance, not modding my T50RPs... =_=
I've only seen one O2 and it might have been a custom case too. But that seems pretty big. Hope I can stack things over it.
I know. But as I've mentioned it in the T50RP thread before (I don't expect you to have read this, btw, don't worry): modifying headphones is not much different from modifying speakers. Headphones are just smaller and have the ear-side cavity to consider. The rest is identical. People putting fiberglass in speakers ----> people putting fiberglass in headphone cups. No difference aside from scale, yes?
Just that orthos/planars are more sensitive to modifications on the rear side of the driver/speaker unit so some things may or may not apply. Give you a general idea.