1200w speakers are not something you'll ever see in a comsumer/home environment.
You'd be looking at a 15 inch woofer & a 8-10inch bass dome, midrange speaker to get anywhere near that spec.
That is essentially live music concert, dj equipment.
That 1200w rating is more than likely pmpo ,which means nothing , & generally in rms would be less than 200w.
Impedance is more important than wattage rating , match that with the amp - 4/6/8 ohm - & upto a certain volume level you can use pretty much any amp.
Really need to know the actual speaker model, or at least the Impedance & an approximation of the size of the drivers.