Ben,Important to remain balanced (or to restore balance): when extending bottom, necessary to extend top too. No kidding.
The tweeter response curve may have some smoothing applied, but I doubt Fountec would publish a curve that is not indicative of the general driver response, there are too many people with measurement equipment to fake curves and get away with it any more.Doesn't the Marketing Department make really swell frequency response charts! They are soooo creative.*
OK, maybe you are right and the balance was total crap beforehand. Add a sub.
*I think I'd read neutral reviews (hint, hint) and trust my mic.
I think you're thinking of two 8Ω in parallel.
But...are the statements the big double MTM aka WMtMW as seen above ?
Aren't the ones with the equal drivers MMMMT ?
I was thinking of these, in two boxes
You guess the electrical ( and resulting pressure in sound ) connection
( series for a pair or mixed series/parallel for a double mono twin set !
each is 350 W ....)