Powering AMP4 through socket: cap at 18v or up to 24v?

Hi again, I've a simple question: on the AMP4 board, there is a label that says "18v" by the powering screw terminal. But on the specs, it says that the AMP4 can be powered up to 24v (and 20v is recommended).

I want to double check if this is also true for the screw terminal (before I burn it up), or does it have a cap at 18v?



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