It is pretty easy. Couple options:
1. Several EQs already have a preset for it, and I think the Sonitus is one of them.
2. Stick an EQ on track. Stick high pass and low pass filters on it (pretty aggressive) then stick a peak in the midrange and move it around until you get a frequency you like.
3. Lastly, if you want, you can add a little saturation or distortion to dirty it up a bit.