the back line we use is drummer-roland v electronic kit with 300w drum monitor,im using a peavey max 450 and peavey 4x10 rythm uses a marshall mg50 watt combo and lead retardist marshall jcm 900 and 4x12 and a 2x12 one each side of the stage.says it all really and our pa consists of 4xrcf art subs and 2xrcf 12"tops and 3xmackie srm 450v2 as monitors when they work.mind we dont use all the pa in small venues