only the vmps large has 2 speakers the other vmps ones have one.you can wire the large in stereo at 8 ohms( 2 channel) or single at 4 ohms( hook the two together).
if you want to save some cash get the large kit with cabinet and use 2 vmps crossovers and the power of your mains till you can afford a amp.(passive)
you can get a %discount from dealers so dont go by the price list at vmps.
pm me if you want my dealers name and number, if you talk to him he can answer everything for you.
good luck
ps - if you live in a apartment dont get the large unless you want out of your lease - lol