The M80ti doesn't have the same type of drivers or the same number of drivers as the M5HP.
BTW, the M5 comes with an HP driver; there's no choice in the matter. The HP drivers are more linear in magnitude and phase throughout their entire SPL range compared to the standard drivers. What I don't know is how audible that linearity is at lower power levels. Even with an 80 Hz cross-over to the sub and at 4W/channel, my M80v2 woofers are quite active.
The tweeters are in shunt. Disconnecting one will alter the response of the other because the cross-over will see a higher output impedance.
Also, the reason for dual tweeters is for reaching higher sound pressure levels. If you disconnect one, at higher power levels you could thermally over-load the other. At best, it would sound distorted. At worst, it could permanently fail.
