Welcome SMOKEMONSTER! i think he could get 4000 Watts only on a 240 volt line and a Variac to hold that voltage steady.
on a standard 15 Amp. line, continuous wattage is limited to less than 1800 Watts.
in the end, it's like my pro amp; it's about 700 W/ch but so far i've used only about 120 Watts/ch. which is plenty. but it's always a good thing to have some spare, on condition one is careful with the gas pedal.