How low can we go? EP500 v3 Subwoofer frequency?

I came across a cool thread on the AVS forum's which includes a list of movies with chapter time stamps and frequency charts for the low BASS scenes.

AVS Forums - The New Master List of BASS in Movies with Frequency Charts

Some of these movies have extremely low frequencies, all the way down to 6Hz in Black Hawk Down!!!

I want to try out some of these scenes with my setup, but I'm wondering how low can my EP500 really go?

I see these specs on the Axiom info page, but I don't know how to decipher them:
Anechoic Resp. +/- 1.5dB 18Hz - 150Hz
Room Resp. + 3dB/- 9dB 17Hz - 150Hz

Thanks all!