im looking for a subwoofer which is compatible with my sembrant sb750

[khent.bigbossuno]

im not satisfied with the bass it produce thats why im looking for a subwoofer compatible to meet my criteria.

 

[jsmithepa]

Apparently this puppy has 2RCA input, so ideally you are looking for an active (self powered) sub with 8" or large driver, IMO, with the following hookups:

RCA L+R input
Crossover Knob
Gain knob.
RCA L+R Output (after having gone through crossover, send small signal back to soundbar).

So.... TV ---(full range signal)---> SUB ---(high passed signal)----> SB.