I have the Shaker 500 and will be installing the JL Audio Stealthbox and Alpine PDX-M6 mono amp. I also purchased a LC2i line out converter (LOC) because I do not want to replace the factory head unit. The tech at Crutchfield stated I should tap into the rear deck speakers at either the Shaker amp output (located above driver kickpanel) or at the rear speakers themselves...it does not matter. He stated the rear speakers produce a good range and the Alpine amp would filter for the lows. From reading other forums, it sounds like the rear speakers are not good to tap into because they are plain ol' crap.

Does anyone have a definitive answer with good reasoning on what should be tapped into...the rear speakers, the subs in the doors, or the door speakers?