Take a T7 bit (thanks Laz) and start opening it up.

The backside view of the earcup shows the circuit board. There is a cavity on the ear cup, but it looks to only be as deep as necessary. Wires going to the speaker are strain relieved with glue (not pictured)

Another view shows the BES2000 SoC

The ordering of the colors of the wire: Blue-Gold, Green, Red-White, Blue, Orange, Red. Thanks Grant!