It's because everything, and i mean everything comes zeroed out, nothing comes with 'normal' factory settings.
You have to set all the DTA's for each speakers, crossovers, crossover slopes, and the eq is quite involved.
Rather than having bass, treble, and midrange levels, or even a 9-band eq or something similar, it has a fully adjustable 4-band eq, where you actually have to set the frequency midpoint for each of the 4 bands, the slope for the eq, and then of course the level.
And on top of that, you have all of the srs wow settings, which are focus enhancing, trubass enhancing, and a 'spacial' surround type setting. The kenwood also has settings for the type of cabin, and the types of speakers and subwoofers in the car.
There's just so many different settings, and each one plays upon the others, so it just takes a lot of tweaking to get everything just right.
It's not a bad thing, once it's setup it sounds better than any head unit i've used to date, excellons and alpines included.
Oh, and two loops that cause lots of frustration:
1) If you set all of your speaker settings, your levels, your crossovers, your phasing, and your dta's, BEFORE you tell the unit what type of speakers you have, or the cabin size, it will reset all of those settings!
~and~
2) If you forget to turn the internal amplifier off BEFORE you set all of your settings and gains, you're not getting the full 5v preouts, and you'll need to readjust all of them, your gains atleast. Once you turn off the internal amplifier, you gain the 5v preout, and the ability to turn the volume to 35/35 without distortion.
In all fairness, reading the INSTRUCTIONS front to back beforehand would've saved me a lot of time, but i was excited!!