Rod, you can't "fix" reverberation by using EQ. All you are doing is removing energy from the signal and in many cases you are being very heavy handed about it. I'm a deal with the problem rather than messing about with the symptoms.
Yes, I know you agree with me, and EQ is helpful..ish.
This is where I am with methods of correct, fix the problem at source. else why buy speakers with such full range if you going to limit the signal sent to them...
OR, if they are ported stuff something in the port and roll them off earlier.
The issue with traps you need enough coverage, so one trap in a corner may have limited effect....
JTC, where are you located ? .....
Are you any good at simple DIY, if you want to make some like the GIK I can give you some tips ..... nothing like a bit of reverse engineering ... I've also created my own QRD/Monster trap design