@ghulamr
I use 2 REL S/3 SHO subs which are used for Hi Fi Stereo and in conjunction for movie surround sound bass. I did not want lengths of cable around the room so I used the longbow transmitters for each. These are connected to the speaker outputs so that can accurately produce the almost inaudible bass below your speaker pair. They also connect to the LFE for movie impact. The S/3 is smaller, yet with a pair, are damn fast, exhibit that beautiful low bass that you can feel, and when setup correctly are nearly inaudible, which is what you want. (unless you are into doof doof).
I am not a sales person (ret in Aus.) so have no particular interest in any brand of equipment. I am just passing on what I have experienced.
AMG