| OK, nevermind - found the real problem
And, since I'm using factory head unint and PAC OEM-2 to convert to "unamplified" signal, that's where the problem begins. Sounds either that OEM-2 has bad "conversion" or headunit puts out ****** signal. I switched OEM-2 input from low power to high power, it's somewhat better, still distorts too much.
And, I have to mount woofers better because not much bass in front, only mid-range and highs.
Worst comes to worst - replace the headunit with that new Alpine 9855, that's gotta fix it then. | 
