Why does it even matter what power the amp is? That’s not how subs work
if you saw a 600 watt 21” sub that hit 130db max output vs a 6000 watt sub that only hit 120db of max output which sub plays louder? The driver and the cabinets have more to do with output and the amp is a tool to make the driver work. The Rythmik fv15hp has already proven this before. Has more output with a 15” 600 watt amp than a few psa 18” subs with 900 watts. Or we can laugh at how the fv15hp comes close or outperforms a svs pb16 ultra with 1500 watts and a “16” driver. The monolith 16 or 13 are output monsters. I still have dual mono 15 and they have tremendous output.
below are some numbers I got from rew in my room playing dual fv18pc, dual mono 15 and dual svs sb3000 and my sons bedroom setup with dual infinity 12” ported subs.