That's a nice, compact amp. You shouldn't have any problem at all mounting that under the T4Rs seats.

If I may offer an option when it comes to routing the RCAs & speaker wiring (other than down the sides).... The center console actually has room to run them to the underseat areas, IF you are willing to notch the bottom side of the console to run the wiring through.
My current set-up has my sub amp mounted in back, which is the only amp I'm using now. But I also pre-wired the underseat area for another amp for my front & rear speaks, for when I add that. It worked out nicely. I sleeved the wiring & RCAs in snake skin expandable sleeving too, so it's nice & neat, as well as protected. Power was run conventionally (down the side, to avoid noise induction).

Anyway, just my $.02. You obviously know what you are doing. Let me know if you do need that power plug adapter.

I have researched this forum for hours but cannot find a definitive answer to the simple question. What is the OHMs of the front door tweeter and woofer. I know it says 2 ohms everywhere but it is also said they are wired in parallel meaning the load would be 1 ohm. I don't believe JBl put an amp in the system that can run at 1 ohm. I want to replace the front door tweeter with an aftermarket JBL 2 Ohm tweeter JBL GTO17T and the front door woofer with a 4 ohm KENWOOD KFC-X183C 7" will this setup work and not overpush the existing amp??? Thanks in advance for any insight or advice.

I just finished putting the JBL GTO17T (eBay) tweeters in my 4runner. SUPER EASY they come with a star shaped adapter that I just drilled new holes in the tweeter mounting bracket and they mounted right up. I left the factory crossover in place and used it. I also replaced the front door 6x9's with the Kenwood Excelon KFC-X183Cinch coaxial....and the factory amp drives it perfectly. I think that the original system had 4 ohm 6x9's and 4 Ohm tweeters so in parallel the load is 2 ohm.....I was concerned also but the kenwoods and GTO tweeters are amazing. One word of caution make sure you use all the foam trim especially the piece that goes between the speaker and door panel...... With the speaker upgrades so far I am almost done.....anymore would be a waste.......

I know this is an older thread, but thought this may help in case someone else is looking for this information.

The factory speakers are 2 ohm impedance. Each channel of the amplifier will see ~2 ohms/ channel. They can state that the speakers are wired in parallel because the tweeter and mid in the front doors are ran that way, but with the capacitor on the tweeter, the impedance will stay close to the same over the given frequency range. If you use passive crossovers on a channel, the impedance doesn't halve like it does if you are running two (or more) speakers in the same frequency range.

So each channel of the amp will "see" a 2 ohm load.

My husband and I decided to cut the factory wires in the 4runner and we have no clue which wires goes to what. What wire colors are what for a 07 4runner sr5 that is non jbl?

Rather than cutting wires, or running wires from the head unit, I intend to tap into the existing amplifier harness. I have ordered spade blade crimp wire connectors

I have also ordered a Metra 70-8117 harness, but I'm not sure if that connects to the amplifier harness at the rear of the truck. I will update the thread when I know this information.

Based on the wiring diagram information provided in this thread (thank you @Rhoov1 for the wiring diagram) I can get most of the audio I need, but I have some questions. Please note my head unit, door and sub audio system is aftermarket. I am trying to connect an aftermarket amp.

My main question regards the RCA inputs. I can run them from an aftermarket head unit, but I'm wondering if I can tap into the wiring harness at the rear of the truck with a speaker wire to RCA connector

Question: Is this an RCA input on the JBL Amplifier Wiring Harness?
- Pin 2 Left Input -
- Pin 3 Left Input +

Copy of image for convenience. I hope it displays.
http://uploads.tapatalk-cdn.com/2015...b9a50a36f3.jpg

These speaker outputs I can run from a 5-channel amp

- Pin 28 L/R (Left Rear) Door Speaker +
- Pin 37 L/R (Left Rear) Door Speaker -

- Pin 29 R/R (Right Rear) Door Speaker +
- Pin 38 R/R (Right Rear) Door Speaker -

- Pin 30 Left Front Speaker +
- Pin 41 Left Front Speaker -

- Pin 31 Right Front Speaker +
- Pin 42 Right Front Speaker -

I would run the 2 Ohm Sub in series for a 4 Ohm load
- Pin 32 Sub Coil 1 + <-goes to-> Pin 44 Sub Coil 2 -
- Pin 33 Sub Coil 2 +
- Pin 43 Sub Coil 1 -


Center Speaker I can run from the head unit 50W at 4 Ohm.
Question: Is the Center Speaker 4 Ohm or 2 Ohm?

Rear Pillar Speakers stock wires are run in parallel.
Question: Are they 4 Ohm in parallel to 2 Ohm, or 2 Ohm in parallel to 1 Ohm?