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post #1 of 9 Old 09-19-2016, 10:04 AM Thread Starter
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Pioneer 8100NEX and Pac RP4 - CH11

Hello All,

I installed my Pioneer 8100NEX over the weekend with the Pac RP4-CH11 interface. It sounds awesome when on HD Radio, Pandora, etc. but when I try to use the NAV or make a call I get a really squeaky, static voice through the speakers. My wife says she can hear me just fine during a call but she sounds horrible. I do have the factory Alpine amp so I wired the front and rear speaker wires together per my research. Am I missing something?

Amp'd 14 JK Unlimited Rubicon | RE 2.5 Lift | RK Control Arms | Poison Spyder Brawler Bumper & Narrow Crusher Flares | JW Speaker Headlights and Tails | Vision-X LEDs | Adams Shafts | Method Mesh Wheels | 35x12.50x17 General Grabber AT2's | SuperChips FlashPaq | Pioneer 8100NEX

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post #2 of 9 Old 09-19-2016, 04:07 PM
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Ok I had the same thing with my 4100. Harness A or B for PAC? From what i remember, the speaker for the Pioneer communications audio is tied in some how to reason you can't get front to rear fade and I had to recheck the wiring diagrams and ended up resoldering to the correct wiring based on that but I don't have the wiring diagrams where I am.
Sorry if this isn't helpful I didn't really label or document my adventure.

I think from http://www.pac-audio.com/PACProductD...ons_042111.pdf:

Vehicles with a factory amplifier: The factory amplifier only accepts two audio
channels (left and right). The amplifierís fading is controlled by data communication
from the factory radio. The aftermarket radio does not have the ability to control the
amplifierís fader. Connect the front outputs of the aftermarket radio to the rear inputs of the 22 pin radio connector. This will
allow navigation voice prompts and Bluetooth calls to be heard. The rear speaker outputs of the aftermarket radio are not used.


make sure you tie the correct front outputs of the radio to the correct rear inputs of the connector and check that soldering. I think I wasn't paying attention during that wiring and got something wrong.

2013 PBU JKU-S, 37x12.50R17 KO2s, Fuel D552, RE: 3.5progressive+hydrbumps+disconnects TF:TB-DL-TR+Long arms+LCAskids+FoxResi+tailgate, grade 9 bolts, 10th hood, NemInd fenders, RSE Al rear, TNT stubby + sliders, ORH top, KCGravityPros, JWS taillight, Riddle cover 4.56 eaton elocker, sleeves + chromolys, DT BJs, Mopar + DT brakes
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post #3 of 9 Old 09-20-2016, 07:04 AM
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If you "wired them together" then depending on how you did you either Doubled or Halved the impedance of the speakers to your head unit.
This will either cause the speakers to receive half the power, or drive the head unit into giving them double the power. The first way will reduce the output from the speakers, the second way can/will fry the head unit preamp or speakers.

By "sounds awesome" do you mean it's louder? If so you are probably over driving those speakers.

Do as jkupbu pointed out and connect the front outputs of the aftermarket radio to the rear speaker wires, and nothing more. You lose fade control, but your factory amp will send full signal to all sets of speakers now.

This may be the problem, it may not, but you need to correct your setup first.

2007 JKU Sahara........................... 2015 JKU Sahara
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Teraflex 44 front, Stock 44 rear........35's
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post #4 of 9 Old 09-20-2016, 10:00 AM Thread Starter
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Quote:
Originally Posted by jkupbu View Post
Ok I had the same thing with my 4100. Harness A or B for PAC? From what i remember, the speaker for the Pioneer communications audio is tied in some how to reason you can't get front to rear fade and I had to recheck the wiring diagrams and ended up resoldering to the correct wiring based on that but I don't have the wiring diagrams where I am.
Sorry if this isn't helpful I didn't really label or document my adventure.

I think from http://www.pac-audio.com/PACProductD...ons_042111.pdf:

Vehicles with a factory amplifier: The factory amplifier only accepts two audio
channels (left and right). The amplifier’s fading is controlled by data communication
from the factory radio. The aftermarket radio does not have the ability to control the
amplifier’s fader. Connect the front outputs of the aftermarket radio to the rear inputs of the 22 pin radio connector. This will
allow navigation voice prompts and Bluetooth calls to be heard. The rear speaker outputs of the aftermarket radio are not used.


make sure you tie the correct front outputs of the radio to the correct rear inputs of the connector and check that soldering. I think I wasn't paying attention during that wiring and got something wrong.
Ok. So don't use the rear outputs of the new radio at all? I put the front and rear from the new unit to the rear of the harness. This sounds like the problem but I have a quick question... If I only hook the front wires from the new unit to the rear or the harness and don't use the rear outputs on the unit, won't I only have music coming out of the rear 2 speakers?

Quote:
Originally Posted by D94R View Post
If you "wired them together" then depending on how you did you either Doubled or Halved the impedance of the speakers to your head unit.
This will either cause the speakers to receive half the power, or drive the head unit into giving them double the power. The first way will reduce the output from the speakers, the second way can/will fry the head unit preamp or speakers.

By "sounds awesome" do you mean it's louder? If so you are probably over driving those speakers.

Do as jkupbu pointed out and connect the front outputs of the aftermarket radio to the rear speaker wires, and nothing more. You lose fade control, but your factory amp will send full signal to all sets of speakers now.

This may be the problem, it may not, but you need to correct your setup first.
I will try this when I get home today... But as far as the "Sounds Awesome"... it is crystal clear audio and sounds 10x better than my 430n did, even at high volumes. Not sure which way I did it other than how I described it above

Amp'd 14 JK Unlimited Rubicon | RE 2.5 Lift | RK Control Arms | Poison Spyder Brawler Bumper & Narrow Crusher Flares | JW Speaker Headlights and Tails | Vision-X LEDs | Adams Shafts | Method Mesh Wheels | 35x12.50x17 General Grabber AT2's | SuperChips FlashPaq | Pioneer 8100NEX

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post #5 of 9 Old 09-20-2016, 10:37 AM
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Thinking more about how the CANbus system integrates and actually controls the amp, you might actually be ok having the outputs of the head unit tied together. Though I would still advise not doing it that way.

Yes only use the front output of the head unit to the rear input of the adapter harness. No you won't only have the rear speakers working.


The dumb "smart" audio system used by Chrysler will play full output through all speakers if wired this way, you just lose fade control now.

2007 JKU Sahara........................... 2015 JKU Sahara
5.3/6l80E......................................2.5" Rock Krawler Expedition Stage-1
Teraflex 44 front, Stock 44 rear........35's
Bastard lift
Totaled; being rebuilt
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post #6 of 9 Old 09-20-2016, 12:39 PM Thread Starter
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Quote:
Originally Posted by D94R View Post
Thinking more about how the CANbus system integrates and actually controls the amp, you might actually be ok having the outputs of the head unit tied together. Though I would still advise not doing it that way.

Yes only use the front output of the head unit to the rear input of the adapter harness. No you won't only have the rear speakers working.


The dumb "smart" audio system used by Chrysler will play full output through all speakers if wired this way, you just lose fade control now.
I'll give it a try when I get home... Any idea / advice on where to hook up the pink "Speed Sensor" wire and the light green "Parking Brake" wire from the back of the unit?

Amp'd 14 JK Unlimited Rubicon | RE 2.5 Lift | RK Control Arms | Poison Spyder Brawler Bumper & Narrow Crusher Flares | JW Speaker Headlights and Tails | Vision-X LEDs | Adams Shafts | Method Mesh Wheels | 35x12.50x17 General Grabber AT2's | SuperChips FlashPaq | Pioneer 8100NEX

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post #7 of 9 Old 09-20-2016, 05:47 PM
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I don't. I'm not familiar with that unit to know what the speed wire gets you.

The brake wire I'm sure is for playing DVD's while parked? I've always used a PAC unit (dont know number off hand) that fools that signal, or for less smart units just a toggle switch that grounds that wire.

2007 JKU Sahara........................... 2015 JKU Sahara
5.3/6l80E......................................2.5" Rock Krawler Expedition Stage-1
Teraflex 44 front, Stock 44 rear........35's
Bastard lift
Totaled; being rebuilt
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post #8 of 9 Old 09-22-2016, 10:16 AM Thread Starter
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All done and everything is fine now... Literally hook the front wires from the deck to the rear wires on the harness and leave everything else unplugged (Speaker wise). then connect parking, speed, and reverse wires up and you are done! Bluetooth calls and NAV lady sound great now.

Thanks guys!

Amp'd 14 JK Unlimited Rubicon | RE 2.5 Lift | RK Control Arms | Poison Spyder Brawler Bumper & Narrow Crusher Flares | JW Speaker Headlights and Tails | Vision-X LEDs | Adams Shafts | Method Mesh Wheels | 35x12.50x17 General Grabber AT2's | SuperChips FlashPaq | Pioneer 8100NEX

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post #9 of 9 Old 12-29-2017, 07:33 AM
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So just to clarify, the rear speaker outputs of the aftermarket stereo head unit and the factory wiring harness front inputs are not used? Or, are the front speaker outputs of the aftermarket unit hooked to both the front and rear inputs of the factory harness?
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