FYI the PCB is very dark brown. it looks black inside the case where there is low light, but like buffbiff said, it looks brown under the flash.

yukon, if you are that bonkers about the mic, you can always buy a nice condenser mic + a mic amplifier and connect it to the Line-in.

repoman, you will hear a difference with your DT-770s, but only at very high volumes, which is probably not a 24/7 comfortable listening level. I definitely hear the difference with my HD280 Pro connected to the headphone jack of the Technics receiver.