I currently have a pair of lsi9's with a small polk sub(I think perhaps a psw 250?) running 2 channel on a marantz pm7001.
I'd like to fill in the bottom and am considering replacing with either the lsi15s or rti a9s. Other option is to keep the lsi9s and add a larger sub, possibly a velodyne dls 5000r. My room is 18 x 24 x 9. Any opinions? Would i be disappointed going from the lsi9s to the rti's? Would the lsi15's provide the low end I'm missing?