thrgkFYI, the G4ME ZERO has identical hardware to the PC 350 SE. The only difference is in the shell color and the material of the pads.
The drivers are the same in the closed back PC 350/PC350 SE/G4ME ZERO. You WILL NEED AN AMP to get any reasonable sound out of these, they are rated at 150 ohms. There is no bass problem if you drive then properly.
The drivers in the open back PC 360/G4ME ONE (which are also basically identical) are the same as the HD 518/558. They are much easier to drive, rated at 30 ohms