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What kind of music were you guys playing?
Look at those amps! You guys must have been LOUD!!!!
Dude, you've got to tell the story behind that picture. What was this place you were playing in? Was it really 1971?
Well from the tailored lightly Bell Bottomed black slacks worn by the 4 guitarists would suggest certainly an early 70's vintage
the 4 the guitarists have the matching Gold Lama sequetioned vest...which was probably a little Elvis flavour......these Vests being synthetic were light in construction and non breathable....this is why we can excuse the drummer for leaving his vest on a close by hook...the guitarist front right probably used the same hair stylist ae EP
Maybe 4 x 10" Fender speakers in the front guys amplifier, the rear right speaker box has maybe 2 x 15's by the position of the lower mounted external microphone...and 2 x 12" in the Fender box to the right [with just smaller dimensions]
Fender Piggyback amplifiers were loud.....also very heavy
So the placement of this Mic close by probably the loudest guitar amplifier raises questions as to the Groups actual sound level
I do remember the early 70's & instrumentalist groups were loud without being over the top....I will not even consider attempting in quantifying a typical sPL during any such performance, nor suggesting Fender Model Series amplifier codes where applicable
So clearly the Club/Venue has 2 [if not more PA box's....[one placed here by the drummer, one by the tallest Fender Twinset], so the Vebue would suggest a reasonable size.......[what was reasonable in terms of numbers for a dance Venue in the early 70's?]
My call would be 1200 to 1800 max...........or is the venue a TV Screen set with wired mesh walls & gates to keep fans out?
I have done enough guessing......someone else may wish to offer comment