If the algorithm is truly based on perception, then the only sensible testing approach dictates listening to the thing. I'll have to admit that despite my better efforts, there was never a comparison in which I even thought that I could tell the difference between the two. To sum it up, what we have here is one mighty fine compression algorithm. It's good to see that Kenwood will be among the first in 12-volt audio to utilize it. The Z919's user interface is heavy on both multi-level menus and display flash.
Volume is controlled with a large, driver's side rocker switch.
A finger-sized joystick that controls most of the deck's functions dominates the other side of the faceplate. The Z919's interface does get two big innovation bonus points. Practically every professional and home CD player ever built offers this relatively simple function but for some reason, it's a rarity in car audio. It may seem like an inconsequential gripe, but there are times that you just want to pause, not mute or attenuate or some other foolishness. Secondly, that little joystick thingy has potential.