DEQ2496 is excellent for it.
It has both graphic equalizer 1/3 Oct (31 slides) and 10 band parametric equalizer that can work in conjunction.
For Mono PA you can use one channel only (the DEQ2496 is stereo with two independent channels)
It has also anti feedback filter
I am using the DEQ2496 for room correction of my listening room by setting the filters manually based on REW measurements.