Yes i should be able to, but i only have schematic tools at work, so i might take a little week or so to publish.
But short You need 2 hall elements for dualrail or for single power line supply. The one i have been using can carry about 120A (if i read datasheet correct) and outputs neer 1mv pr A going through. By meassuring this and compare with a "maximum", You could have a opamp to compare and then control the needed action.
Some one told me that MusicTronic also used hall elements but at output, but i do think it would be all to late to reakt on the output short current.
Just had an idea. If one makes a multi channel amp, then let the hall output to a multi channel adc and the to a microcontroller, by this You could meassure all amp modules but only needs to shut down the defected.
Ok i'll be back soon i hope
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