Check Cioks DC-7. A tiny bit pricey but best there is.
+1. It’s great.
The only problem with it is that they don’t do a smaller one. I’d really like a 4-socket one. They do a similar 4-socket device but it needs a DC-7 to drive it (AFAIK).
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getting off topic, but
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Cioks makes a PowerMini 4 output power supply for Eventide that can be powered by itself.
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Strymon Ojai, tiny form factor and 5 plugs.
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Despite the name, Cioks 4 can be powered by itself. Just make sure to buy it with the power cable (not just the link from DC-7).
You can even power it from a USB power brick, which is why it’s easily my favorite one.
https://cioks.com/power-supplies/future-power-generation/cioks-4-expander/
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If I’m reading it right CIOKS-4 can’t be powered by mains AC. It takes up to 24v input, not 110/240. So I’d need another source before it. Happy to be wrong…
This!
Below is what’s needed and it’s what I already have (so not countering for fun… I run Cioks 4 independently with its own power supply).
With that said… looks like Cioks discontinued it as a separate product. You still might be able to use something else. It’d be important to contact Cioks first. They respond quickly and were very helpful when the one I originally purchased came without the power supply.
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The Eventide branded one is just that, Cioks 4 rebadged for Eventide.
“CIOKS 4 Expander truly unique is the fact that you can power it with anything from 9V to 24V DC or 9V to 12V AC via the non-polarized DC socket input. Furthermore CIOKS 4 can even be powered by connecting it to a USB powerbank via its 5V USB C input or by using a tablet or laptop power supply with a USB C plug.”
thread on talkbass describing using it by itself
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Nice one… It’s good they didn’t cut down Cioks 4. I have the Powermax v2 in addition to the DC-7. Powermax loses the 3 of the 7 switchable outputs. Which, in my case for the pedals I run is fine. I’ll appreciate the option not to pay full price for another DC7 
Will just add info for newcomers to powering multiple stomp boxes, that there are a number of different brands out there doing similar things to the CIOKS one, but often they have lower total output, or limits the amps individual outputs can output too much. I tried several solutions before ending up with an Eventide branded CIOKS unit myself, which takes everything I throw at it. It has powered two OTO units (15V), a Midihub (USB), a TT-303 (9V I think) and various pedals. Wouldn’t get anything else.
Edit: Be ready to spend a little extra on special cables if you require more than they provide in the box. They provide enough 9V center negative ones. But not enough center positive ones, and your devices’ barrel jacks might have special diameters.
Edit: corrected the name of my 303 clone
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Interesting, I hadn’t seen you could power 15V units. Which is your PSU? I still have my Powerfactor but don’t see the adequate settings.
Which seems to be more or less a DC-7 rebranded.
I thought the fact that the OTO were asking a bit more Amps (500 mA) could be a problem, but the Cioks is surely powerful enough to handle it.
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If you also run Boum, you’ll need to use two ports to power it (2:1 adapter needed). So 4 switchable ports needed to power all 3.
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My Boum seems to run on just one port. I’ll do a bit of investigation tho’ in case I’m doing something wrong.
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It’s not that it can’t work with one, but supposedly (as I remember it) for the health of Boum, it should be two…
I don’t remember where exactly I was seeing this, but I know I found it repeated often with power requirements on different forums. Maybe even on Elektronauts?
I’ll try to look for it later and post back.
Edit: Found it here (read all posts on page):
https://www.otomachines.com/forums/topic/power-supply/
I checked the Boum manual too. It says the unit needs 500mA. Thanks for the tip off. I’ll need to re-jig my power cables.
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