Based on the specs, it can achieve frequencies down into the high teens "in room", however, understand this is not at full output. At some point all subs begin to fall off. It WILL stay within a +/- 3db tollerance from 28-150hz. A lot depends on your room, placement, etc. on what you will achieve, this is true with any sub. Also, understand you can't 'hear' frequencies that low anyway.
Anechoic Resp. +/- 3dB 28 - 150 Hz
Room Resp. + 3dB/- 9dB 18 - 150 Hz
M80s-VP180-QS8s-EP600-2xEP350 Denon3808 Outlaw7700