Back from the dead

This is one of our PA speakers. It was dead, which was annoying as a) we need it for Hendstock and more urgently b) we also need it for the impromptu prom thing next week.

Bugger, last time one of these broke it took months to get it sorted. Being an ex technical sort of chap I have a number of methods to try and fix broken things.
1) a light tap- no
2) a slightly less light tap - no
3) take it apart, wiggle and reseat every connection I can find. Only flipping worked!
What a relief.