Things I'm working on these days.
Do closed cups make the phones sound closed, or is there more to it than that?
The uninstalled set is nice!
Grado drivers don't sound that great closed.
Drivers that do sound good closed are PX100ii to make a closed SennGrado or you can use a Koss KSC75 to make a StratoKosster.
For closed versions you need leather pads or the bass is too thin.
The uninstalled set is Maccasar Ebony
SennGrado
http://www.head-fi.org/t/738035/senngrado-thread
StratoKosster
http://www.head-fi.org/t/611982/the-stratokosster-a-closed-diy-headphone-based-on-the-koss-ksc-75-driver-and-grado-cup-design