Interesting, I read the FAQ about the 218 where it was stated it had a linear PSU. Is this incorrect for all revisions of 218? Then we have something Meridian needs to clarify where this come from...

From the Meridian Support/FAQ - 218 Zone Controller
Originally Posted by Meridian
8. How is the 218 powered?
The unit features a high-quality linear PSU and is powered via a “clover-leaf” mains lead (supplied with the product).

I'm interested in how to fit an external DC socket easily for the 210, 218 and the UHD722 / HD621.

I recently did this procedure with some help for my fiber-router (Mikrotik CCR2004-1G-12S+2XS) which I power from HDPLEX with 2*12V/5A specified.

For the router I used a 2,1mm/5,5mm DC socket, 8mm drill for chassis. A 4 pin 12V ATX cable which was soldered to the DC socket. Very simple. Can we do something similar with the 210 / 218 / HD621 / UHD722?

DSP8000SE, DSP7200SEHC, DSP5200SE sides, DSP7200SE rears, 861v8, 210, Sim2 Ultranero 4, Stewart Cinecurve 2.35:1, XEIT CM-5E Anamorphic lens, Dune HD Duo Cinema 8K and Wireworld Platinum 48G HDMI -> UHD722 -> Shunyata Omega Ethernet. Shunyata/Furutech power-cables/filters. SR Master Fuse@861v8. Uptone Etherregen with 10MHz OCXO clock.