Different Venue every week .... is EQing the FOH "Mains" rather than the individual inputs a shortcut ..... or heresy?

[Pirellithecat]

Been tinkering with this ...... 
Have a fairly good mix sorted out where the Kick and Bass complement each other, the Vocals aren't too harsh, and guitars pretty much work with the rest. 
And then we play another busy pub, with its unique boomy resonance or shrill upper frequency peaks. 
So why not use the "Baseline" mix and EQ the Main PA speakers to take account of the room's "specialness"? 
Particularly important where time is tight and a sound check is a one song opportunity....... 
Using GEQ rather than PEQ on the mains, and adjusting sub volume  as necessary. 

Is this Heresay or potentially a good idea? 
 

[Bill Fitzmaurice]

Since the room affects everything in the PA you want to adjust the GEQ. 

[Downunderwonder]

If more PA was ever eq'd for the room we would have less rubbish sound.