Where to tap into speaker wires for amp?

I added a powered sub under the driver seat. The sub came wired with L and R tap wires. I removed the cover between the doors (search site or Google), used "T taps" from O'Rielly auto parts, and taped/spliced the wires into the rear speaker wires - you do not need to strip the wires. Don't recall the color, you can Google or search this site. The speaker wires are easily accessible, and are bundled with some other wires, wrapped with a cloth tape. The wiring color is the same for all recent Prius.

 

From my understanding, the driver's side kick panel only houses the speaker leads for the front, driver's side main and tweeter (they are wired in parallel).

Just curious, why don't you want to tap into the speaker cables behind the head unit?

 

I'm about to do a similar project. I ordered a Kenwood KAC 5206 2-channel amp to power my front Polk DB651s off the factory non-JBL navigation headunit. I will use speaker high level input wires instead of RCAs. I will install/mount the amp in the rear cargo area.

What path do you recommend running the speaker wires from the HU and from the amp back to the HU? I'll obviously need to run two pairs. For now my plan is to go directly to the back of the HU and down the passenger side of the vehicle. Will the wires come across any noise interference with any high voltage lines? Do you guys recommend another efficient route to access the front door speaker inputs? I'll obviously need to snip the factory wires to go TO the amp and from the amp back to the door speakers. I'm guessing the back of the HU is the most logical place.

Also which harness on the back of the HU is the one with the speaker wires? I already found a diagram which identifies colors. But I want to make sure i access the correct harness.

 

I did it today,

This is the right side, there is a connector with red and White wire, you can release that.
On the left side there is a connector with multipele wires, but you need the yelow Black one.

 

^ you mean the speaker harness is on the right side? (Passenger side)

 

Passenger side speaker cables for the right side, and right rear is red/White, left side Black/yellow is on the left. Ik cut this wires for the high low converter and the cables in the harness to the back.