I do small bands mainly in pubs and small clubs. I am currently running a pair of speakers using a 2 Eminence Kappa 12's,
this is usually enough for my purposes.
http://users.tpg.com.au/users/gradds/twinkappa1.jpgThere have been a couple of time recently where I thought some extra down the bottom end would be nice, and would ease the load on the main bins. I would run them from the sub out of the Behringer FBQ 3120, through a separate amp.
I have a pair of the following drivers that I am not really using,
http://users.tpg.com.au/users/gradds/jaycar%20PA15.jpg
and was considering using them to provide the extra low end.
Just not sure if they will make much difference??