What makes speaker's sound big?


Does a speaker need to have many drivers or a large driver area to sound big and fill the room?
I am asking this question because I have a pair of tekton design double impact and would like to replace them with smaller speakers and a pair of subwoofer's to better integrate the bass into my room.
I just borrowed a set of B&W 702S. The are good but the just don't make that floor to ceiling sound that I like.
Maybe I have already answered my own question (: But again I have not heard all the speakers out there.
My room measure 15x19' and the ceiling goes from 7.5 to 12.8'

martin-andersen
dynaudio speakers from contour,confidence  line sounds big.It does not matter if it is  floorstander or bookshelf .
A few years ago, in our prior house, I moved my audio system from our 13'x24' living room to a 24'x26' family room and my then pair of Totem Fire monitors and Velodyne sub woofer with a 10" driver just didn't fill the new room.  I ended up replacing the Totems with the Focal Sopra No2's and the Velodyne with a pair of JL Audio F113V2's and they did fill the room up.

We recently moved into a new home with a 14'x19' listening room and my setup definitely fills the room.  I find I'm setting the volume level on the preamp a few percentage lower.

I auditioned the Focal 1038's driven by a McIntosh MC452 (450 wpc) power amp in a speaker room that was about 22'x22' and was blown away at how they filled the room.  I would have "pulled the trigger" and bought those, but one of my audio buddies let me know that the Sopra line was about to hit our shores, so I waited a few weeks and ordered those.
Easiest answer ever:

MAGNEPAN

I realize that every manufacturer is not making tall speakers--wonder where they got THAT idea??

Try the best and the original.  Jim Winey was a pretty smart engineer, I guess.

Cheers!
Even though I know you guys like to shyte on MC, as an owner of a pair of Double Impacts I gotta say adding just one subwoofer so far has made a huge improvement. The sound got bigger and I think it brought out the mids and highs as well.
Been looking for a new house with a dedicated audio room. I plan on 2 subs when we get there.
From what I understand it will get even better.