So here's a question for all you guys.
- Acoustic foam lining the inside of the cups
- Plasticine filled in the baffles, and lots of it (not overdamping)
- Black Creatology felt glued in place of the stock white foam, 1 single layer
- Bass port felt untouched but port is closed about 2/3rds of the way (maybe a bit more) with electrical tape on the outside of the cup
- Stock black felt on the ear side of the baffle has been removed
- Dynamat on the ear side of the baffle
- Two layers of acoustic foam doughnuts over the Dynamat on the ear side of the baffle
- Shure 840 pads with center foam cut out of them
- Leather belt AKG K701-style headband
I have a much simpler suggestion.
Remove the craft felt, put about 6 or 7 "regular" cotton balls (tease them apart to loosen the fibers) into the cup, and apply a reflex dot to the center square only on the inside of the driver.
With all due respect to transport and micropore, that's a short-term adhesive product meant to last for a couple of days. It's unknown how this will age, or if the glue will even stay tacky and hold for extended periods, or how the aging of the adhesive may change the sound. For the center reflex dot, I used electrical tape, which should adhere for years and won't change properties.
You'll need to fiddle with the porting a bit, but on my 840 setup about 80% open yielded a very nice sound with extended bass, and clear highs. You could also cover a second or third square with the electrical tape as an experiment. It should brighten things a little further.