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If the voice index is the KDC X890's most useful advanced technology, then the most entertaining (and perhaps least practical) feature has to be the G-Analyzer function, a built-in motion detector to measure the gravitational forces acting on the head unit, which it then translates into graphics and text data. According to Kenwood, G-Analyzer (the G stands for Graphic Motion) can measure and analyze a car's horsepower. It appears that after a driver has entered the class and weight of a particular car, the X890 will calculate horsepower by measuring lateral acceleration for 15 seconds, giving the result in the form of a graph with the highest reading (that is, the point of maximum acceleration) saved for future reference. But we're somewhat skeptical: in the real world, horsepower is measured using a device called a dynamometer, which takes measurements at an engine's flywheel. These are then evaluated against a number of variables, including the exhaust system, pumps, alternator, starter, and emission controls.
In an admittedly unscientific test, we calibrated the G-Analyzer to the weight and dimensions of a fully laden minivan and shook the head unit around for 15 seconds to get a readout of 320 horsepower: a little on the high side.
A G-Analyzer Stop Watch function is also available, presumably for speed demons to measure their 0 to 60 times while playing their favorite beats at full volume. The X890's instruction manual--which appears to have been translated from Japanese using a computer program rather than a person--warns users not to use "G-Analyzer horsepower analysis or stop watch on public roads." While it is an entertaining concept, we'd also advise drivers not to rely solely on its readouts for reliable information on their cars' performance figures.
The X890 sports a number of additional features, including controls for a Kenwood iPod adapter; satellite radio (separate subscription, tuner, and antenna required); and HD radio. There is also a connection for a CD changer, RCA cables for auxiliary inputs, and three sets of 5-volt preamp outputs.
A removable faceplate make the X890 less vulnerable to theft, and the unit comes with a two-year limited warranty from Kenwood.
