headunit
 

NEVER MIND PLEASE IGNORE THIS POST IM RETURNING THE UNIT.




So today i got a new head unit and crutch field says "Installation Note: This harness uses your factory amplifier; your new stereo must have two pairs of preamp outputs to connect this harness."

How many preamp sets do i need to have a sub? this doesn't make since heres the adapter it says to order someone please help i already bought my head unit at best buy and it only has one preamp.

I have the standard amp not the harmon and on my woofers in the door theres nothing attached to the back of them.