When I started to use Audirvana, I also felt the lack for EQ, primarily because I crave for bass drum kicks (around 48-52 Hz) and I was using a 14-year old, rudimentary, entry level Onkyo subwoofer.
I tried some 3rd party plug-ins (which were not bad!) but eventually, I bought an ELAC subwoofer with parametric EQ and that was it for me. I was able to dial in precisely what I wanted. In this case, fixing the root cause (poor subwoofer) instead of masking it with EQ was a better, long-term solution.