My room (W X D X H) = 3m x 6,3m x 3.3m
I think the sub with enclosure medium size match my room, I love deep bass but excellent resolution for both music and cinema. There are many choice such as: RL-P18 SoundSplinter, IXL-18.2.2 March5Audio, Tempest-X ExodusAudio..etc and I am newbie, I don't know which according to me, please advice me, thank
That is a decent sized room...any of those drivers with enough power will be nice.
The tempest-X being the least expensive is nice...the other two are beasts.
If you can stretch for those another two options would be the CSS SDX-15 and the DIY Cable 18" Maelstrom-X.
Almost any good driver in a properly designed enclosure for HT will also excel at music.
When you have the space, a large and low tuned ported subwoofer using a capable driver will yield the most balanced performance vs other alignments when the goals are deep extension, linear frequency response, and clean headroom.