410pro

i bought a Warwick ProFet 3.2 and Warwick 410PRO this afternoon; both second hand. when i was playing it just then, i noticed that the speakers fart when i play hard. is this normal? if not, can i get it fixed or replaced even though its second hand?

Hi. I have a ProFet 5.1 amp and a 115pro cab. I want to complete this as a stack with a 4x10" cab. I'm just wondering if I should take the 410pro or the 411pro cab. What would you suggest? Is it worth taking the 411pro with 600 watt when I have got only a 500 watt amp but already a 400...