I mean I wasn't talking about actual spl but could you explain me the driver/wattage thing, 2 reasons, one kef website actual says speaker use 15 to 300 watts I suppose that value is wrms, and I heard amps should be a little above speakers so they aren't strained, so kef r11 Meta has 5 drivers and can go up to 300 wrms, so with a 250wrms amp they certainly won't get to 100% possible spl. I'm not saying I need the towers at 300 wrms playing, since even at 40 wrms that gives a spl of 117 db using the site you posted, which would likely make my ears bleed as I don't like LOUD music. But I do love clean 0distortion music. Just trying to learn here.