Yep, there's just a high-pass filter on the M3's tweeter, and the woofer has its own natural mechanical/acoustical roll-off. You have to have a high-pass filter on the tweeter to keep out the bass frequencies, which would otherwise burn it out.
Nothing was changed sonically on the M3ti to the M3 v2. They are identical in sound. The Algonquin, which is just an M3 in outdoor clothes, also sounds virtually identical to its indoor cousin, with maybe a touch more "punch" in the lower bass. The latter is the only slight difference I heard in the blind tests comparing the Algonquin prototype with the M3 v2.
Regards,
