Polkalover, the loudspeaker you are considering doesn't do really loud, let alone ear bleeding. Keep that in mind.
The bass response is spec'd at 45Hz for a -3dB rolloff as measured anechoic. With room boost that should give you very usable bass down to around 35Hz. For nearly all music types there is very little music below that frequency. There's sound, but not a lot of music. Pipe organs and some electronica excepted. As an example, the lowest note on a 4 string bass is 41Hz and for 5 string basses its 31Hz. But modern recording techniques typical roll off these frequencies in order to not muddy up the recording. So at moderate to somewhat loud volumes you really don't need a subwoofer with that loudspeaker in your room. But that doesn't mean you won't like it better with a subwoofer.
