What it is, what’s different about it and what it does to create more lifelike musical reproduction
For years, speaker designers have used tweeters for high frequencies, midranges for mids, and woofers for bass. Crossovers have been used to blend the different drivers together - adjusted until they sound as musical as possible, which is really hard to do. MST Unity drivers now smoothly handle +/- 200 Hz up to 20KHz, precisely the range covered by tweeters AND midranges. 
Therefore, with Unity drivers, there is no need for complicated crossovers. Instead, Unity drivers produce spacious, unadulterated, lifelike music without the crossover - unlike any other speaker system. Their unique, broad frequency range, coupled with their small size and point-source ability, equips them to create the most realistic listening experience you will ever hear.