So I know this has likely been covered in some shape or form and is dependent on multiple factors but. If we talking identical enclosures and speakers working within listed parameters would a 210 (or any for that matter I suppose) running at 200w (Premium speakers enclosure rated at 400w RMS) be louder than 2x (2x10)(second identical cab) running at 100w-130w? The reason I ask is that I have a smaller cab at 4 ohms for smaller gigs and am thinking of adding an identical second for a vertical stack to replace one of my big rigs also allowing a modular 810 should needs must. However the power drop of running these in series may make this a pointless excercise for my smaller heads.? Anyone with advice on surface area Vs wattage aspects? Many thanks