I joined a band a few years back with two 12" subs. You honestly couldn't tell that they were even turned on or off. Next gig I brought my 18" EV subs and the whole band was amazed at the difference.
I have never set the HPF above 100 hz. 80hz is a good starting point, but experiement.
I have never set the HPF above 100 hz. 80hz is a good starting point, but experiement.