The Peavey models are full 48v phantom, albeit global. I have not seen any of these "box" powered heads with individual phantom.
The XR600 topbox powered head series goes way back and wasn't always 48V phantom. Really old ones probably didn't have any phantom at all, and then evolved first to 15V phantom, finally by some time in the '80s ending up with full 48V phantom.
I recall when two amp channels of 150W each was considered big power...
These are workhorses designed to be very easy to use and pretty much plug up and they just work.
I don't recall if there was even a phantom on/off switch on the simple top boxes. The console format powered mixers had richer feature sets.
I was over the engineering group for two generational model upgrades almost two decades ago... I would barely recognize the new models now but the same design philosophy probably still holds true. You don't change the recipe when you're making good biscuits.
PS: If you want Midas mic preamps you need to buy a Behringer topbox.