@ maccino....i would assume that the Non LF kappa drivers would be more suitable than the kappa LF you mention, LF drivers are designed for sub woofer application, they dont work well as a full range driver due to the 2kHz bump, so the frequency range is usually crossed over to allow only the real lows into the mix. i would look at the Em 3015 neo driver, its a big cab and the neo weight savings would be good, i haven't modelled it but would recommend getting the T/S parameters and adjusting the box volume to suit
