So 7X is for Xbox, and that's the only difference with the 7? What about 9?afaik there is no option to use a wireless headset without a receiver. Even the official pulse 3D uses one.
if a Headset supports Xbox wireless then you can use a headset without a receiver but the same headset won't work with playtsat.
hence why I bought the Arctic 7x that has a receiver with a switch that can be uesed in Xbox or usb mode (for PS5 and switch) but the receiver is always necessary. It is really small though