For my own experience, I have background music when a room of 200 m2 with a height of 6 meters MACKIE SWA 1501 m 'in Scotch by his power: it is the impression of having had a 1.5 KW .. . 8 crosses home floor! impossible to live!
And especially to the first version, MADE IN ITALY (nothing to do with the new version made in china!)
I recommnande because in addition it is amplified so cheap for the price.