What's missing from the back of the Droid X?

[Oj467]

I figured it out! It was gonna be for a Subwoofer port!!!

 

[billfisher1]

Anyone else notice the big hump on that back of the phone?

Lol!

 

[RayStinkle]

its not for the antenna because every other phone out there has a case that covers the antenna with no problem. besides the droid x has 2 antennas anyway, so why only pick one of the two...?