 The only other difference is the lobe tilt which is exactly the opposite of the MT configuration.The direction in which the lobe tilts (i.e., the vertical orientation or angle of the lobe) is a function of the difference or offset between the acoustic centers of the two drivers.Since it is rare for a tweeter and mid-range (or woofer) to have their diaphragms or acoustic centers in the same physical plane, it follows that sound waves emitted by them (of the same frequency) will not reach a particular listening position in the on-axis plane at the same time.