Hey there, just thought I'd briefly share this damping scheme that I've found to be particularly enjoyable.
Nothing sciency here, just throwing a few ideas out there for people to try out.
♦ Electrical tape sealing all the vents, bar the 2 outer most vents
♦ 1mm self-adhesive creatology felt around the inner circumference of the black shell cup
♦ 1mm self-adhesive creatology felt on the back of 1mm thick card treble-reflection disk on the rear of the driver - stuck down with double sided tape
♦ 2mm creatology felt (white) loose damping behind driver that does not obstruct the vents (I may replace this with a better fitting disk)
The most important elements here is the felt around the inner circumference of the black cup and the 2 remaining vents - the first of which seems to widen the soundstage considerably and somewhat tighten bass response and the second extends the bass slightly.
I'm not fully satisfied with the white felt... I'm still playing around with the main damping material until I find something that gives more air... but I think these drivers are just more naturally aspired to a 'liquid' sound rather than an 'airy' sound.
You could try stacking layers of gauze if you have that handy. When I get some more secret sauce material ( soon ) I can send you some. I'll message you when I get some more