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I dont know about you guys, but I was a bit confused about the power supply and distribution as well as connector differences between the models. Since I recently got a shop panel to go with my m-class stuff it is a bit more straight forward than I thought. Any way, I thought I would share some pictures for anybody else that may need some clarification.

First is the PSD (shop panel power distribution board) versus the Obelisk (m-odule power distribution). The distribution boards look identical. I dont see any real differences between the two. Obviously the the distribution board is mounted to the obelisk with the leds going to the front panel where the PSD led’s are facing the other direction. The Obelisk also has an additional board for the banana jack and led.
Here they are side by side:

Next is the PS2a (m-class 2 panel power supply) versus the PS4 (power supply for up to two shop panels).
The PS2a is the much smaller black box. It is in a sealed case, so no adjustments can be made. It does have a banana jack for ground as well as a removable IEC mains connector and fuse. The output goes to a Female connector that plugs directly into the pigtail coming off of the obelisk. The PS2a fits perfectly into the m-case.

The PS-4 is in a larger case that can be opened up for fine tuning and troubleshooting. It has an on/off switch which the PS2a does not have. It also has an on indicator LED. The output cable is a 5 pin female XLR (I am not sure if this is standard) which terminates into a male 5 pin XLR panel mount socket. This socket has a Male connector to plug into the PSD (opposite of the PS2a, which again, I am not sure if this is standard). Like the PS2a, it has a banana jack for ground.

Here they are together, with the PS2a on top.

This shot gives a clearer view of the connectors coming off of each power supply:

I really am impressed with the standardization Rex has stuck with over the years. An example of this is the fact that an Oakland era shop panel (now known as the Blue Voice) seamlessly made the transition from the large boat to a shallow m-boat that I purchased some time back with the intention of getting more m-odules. All I had to do was remove the Obelisk and the panel dropped right in. I will say that there isn’t any extra room in there though. The NTO board is almost touching the back side of the boat (it does not touch, but it is about as close as I am comfortable with). Maybe you can see it in this picture taken through the back hole:

I hope this helps at least a little bit. I know it confused me a bit, and it is much simpler than I imagined.