Which by the way is absolute bollox. Yes, using the correct cable is important, and yes by using long lengths of solid bell wire you are going to get big losses!, but even using the worst cable in the world twice around a sports hall then, and maybe then would you lose 120 Watts of power

. You are unlikely to lose 120 Watts of power between your amp and speaker in a standard mobile disco set up. I'd send it him back and tell him to wear it has a hat

.
Seriously, I considered the Warrior Range, but dropped it in favour of the C-Mark versions which I do now instead, since I got a better deal. The Warrior spec sheets did seem to contradict themselves though on the true RMS Output of the Amplifier. However I would go off what is written on the back of the amplifier rather than what some photocopied sheet of paper, or some dealer told you.
Dealers - don't trust 'em!!!!