These speakers are very efficient (> 98 dB, right?) They have 11 driver elements including a pair of 10" drivers. So by "big" sound, I wouldn't think the OP is referring to SPL (provided everything is hooked up correctly and we are not trying to rattle the neighbors' windows).
The OP may be referring primarily to the apparent height/width/depth of the soundstage. This is something many of us struggle with. Before getting into new subs, DSP software, or room treatments, it might be a good idea to experiment more with speaker placement. Several formulas (or procedures) are available on the internet.
The OP may be referring primarily to the apparent height/width/depth of the soundstage. This is something many of us struggle with. Before getting into new subs, DSP software, or room treatments, it might be a good idea to experiment more with speaker placement. Several formulas (or procedures) are available on the internet.