Marshall Electronics V-PS24V-6.25A-XLR-R/A-1 Power Supply, 24V

The V-PS24V-6.25A-XLR-R/A-1 supplies 24 V at 6.25 A on a 4-pin XLR, sized for the Marshall equipment that draws more than the standard 12 V line will carry - the larger multiviewer rack monitors in particular.

The XLR is right-angled, which is the detail that matters once the monitor is racked: a straight barrel needs several inches of clearance behind the unit before the cable can turn, and a right-angle connector does not. That is 150 W of headroom at the wall end, ordered as a single Marshall part number rather than assembled from a generic brick and an adaptor.