is there a list of suitable amps for use with the mk2 empeg?

other than being 4 channel amp are there any requirements. i read in the empeg manual that it must support 4v inputs and have variable gain adjustment. however none of the amp specs that i have seen say that they have these features. do pretty much all amps have these?

sorry for all the questions but i don't want to order an amp and find out it doesn't work with my empeg. i was looking at the sony xm440 - does anyone know if that will work. i don't really care how loud it goes - just want one that works and sounds nice.