Doesn't the Behringer need a proprietary, calibrated mic?
Rane makes a few models of EQs, but I think they go down to 25hz, not 20. Audio Source also had a few models, some with an RTA. Back in the day, Altec made a killer 31 band, 1/3 octave EQ, but it could get a bit noisy.
I have a spare Mac, but it's only a four band unit. Center frequencies and Q are selectable, but it requires a pink noise generator and RTA to properly set up. I use Macs in all my systems and channels and have never needed to adjust more than seven bands, which the later models provide. I also have have an RTA , which for a few beers I can use to help you set up any EQ.