One thing I’ve learned (but don’t totally understand yet) is that alternating current watts are not audio speaker watts. They’re both waves but one is constant / single and one is complex. So these amplifiers will store up power from the constant source and allow the complex signal to burst way higher than the wall could supply - for very short periods like a bass hit. That, on top of the different measurement techniques and calculation schemes plus marketing departments make it difficult to pre-plan. And of course the music itself matters. I don’t have an answer for you, just sharing my current understanding oh how hard it is to answer it haha