Jeep Garage  - Jeep Forum banner

2015 Summit aftermarket sub

Tags
2015 summit
13K views 22 replies 10 participants last post by  cdelgado14 
#1 · (Edited)
Hey guys, just signed up for this forum to see if I can find a resolution to a problem im having. Im an installer of 11 years and a customer of mine purchased a 2015 grand Cherokee summit with the 8.4"screen and harmon kardon speaker system. He wanted to upgrade the sub and add an aftermarket amp for the sub. Installed the JL stealth box in the right rear quarter panel and amp. I was unaware at the time this model came with the active noise cancellation. After installing, the sub produces noise, that will start low and gradually increase, and repeat. Obviously the noise stops when you open the door/trunk as the ANC only works when everything is closed up. I wish it was as easy as mimicking the door being open, but everything is controlled through the CAN-BUS system. I have run into this issue before on the newer Honda Accords as they too have ANC and was a simple fix. Now after some research ive found the ANC is only used when the truck is placed in MDS mode - drops 4 cylinders for better gas mileage. I cant tell the customer, hey sorry - don't use this feature. This noise is apparent in any source, with the radio turned on or off.

I found out that the ANC module is in the back right quarter by the sub box and the vehicle has 4 mics. Before I started messing with a brand new truck to try and resolve the issue, I figured id do some asking around. I read that this module also sends power to the speakers, so it works hand and hand with the amplifier (left bottom quarter).

Has anyone discovered a way to bypass the active noise cancellation? I believe it was not an option for the 2014 models so I don't know if anyone has done anything yet. I am tempted to disconnect all 4 mics at each location in the headliner, but am not sure how the truck will react. If the ANC module and amp work hand in hand, then disconnecting the module will most likely result in no sound at all.

Any help would be greatly appreciated. Thank you!
 
See less See more
#2 ·
ANC also gets engine feed like rpms so that input along with a zerod or maxed input from the clipped mics might not be good.

How about when you clip the mics be sure to loop it for continuity and do it in the cleanest/purest contact possible way to minimize resistance in the connection, thereby, minimizing poor contact based feedback/noise in the system???

Or maybe I'm 180 off on that and closing the loop may give the bad feedback and a straight clip/open circuit is the zero/no feedback version. :confused:
 
#3 ·
I think cutting the mics out of the equation and looping the wires will only cause some sort of issue. Im sure there is some resistance to them that the car reads... Who knows! They over engineer the hell out of everything now. Im still researching before I take the plunge and attempt to do anything.

ANC also gets engine feed like rpms so that input along with a zerod or maxed input from the clipped mics might not be good.

How about when you clip the mics be sure to loop it for continuity and do it in the cleanest/purest contact possible way to minimize resistance in the connection, thereby, minimizing poor contact based feedback/noise in the system???

Or maybe I'm 180 off on that and closing the loop may give the bad feedback and a straight clip/open circuit is the zero/no feedback version. :confused:
 
#6 ·
I read another post about this same thing and the resolution was to simply disconnect the microphones.
 
#7 · (Edited)
That covers MY15 maybe but not MY14 as it has no noise Xcel.

EDIT: Even if the issue is (on MY15) the noise Xcel feedback (so disable stops it) you would still have a non-paired (non-optimized) DSP/Crossover to sub signal unless that sub just so happens to operate in the exact same response range as the HK factory sub which is where the HK DSP/Crossover is set to feed the sub.

The response range diffs may be minimal or not noticeable but it is a technical detail that exists.
 
This post has been deleted
#12 ·
That’s why I said the Overdrive is optional. Its a good line driver like the LC2i. But LC2i has speaker wire inputs, and overdrive has RCA inputs.

Of course you can use any line driver with rca input. Memphis, Soundstream, Pioneer whatever...

So yes the PAC Is your LOC but it puts out a pretty weak signal. So I recommend any Line driver ahead of the amp to boost signal.
And with the ACR-1 remote with the Oversdrive, (or any bass knob remote with whatever line driver) you’ll have added bass control wherever you install it.

PAC Amppro - OVERDRIVE - amplifier, is how I’m set up now and it’s rock solid.
 
#17 ·
I have a 2018 Trackhawk and just ran into the same problem after trying to install the Stealthbox.

If I follow the suggestion here with the PAC Pro, will I need a multi channel amp for the regular speakers too?

Right now I just have the mono amp for the sub.

Thanks!
 
#18 ·
No the PAC Ampro generates 3 outputs. Just use the sub output to feed an aftermarket amp, then the amp to feed the sub. You’ll of course have to disconnect the wires feeding the sub currently from the factory amp. And run your own wires from aftermarket amp to the sub.
And like I’ve stated previously, I recommend a line driver to boost signal for the subs new amp. The amppro outputs are very low voltage and the sub won’t sound great. I got the AudioControl Overdrive for a line driver, and like almost all Line drivers has a bass knob you can mount somewhere near driver seat. I used the side panel of the transmission console. Essentially next to my right thigh when driving.


Factory amp remains feeding mids and highs. However, if you want to put aftermarket amps on your mids and highs you can, but will have to essentially rewire the vehicle complete, or tap all the wires at the factory amp to feed the speakers. But again, this is not required.


Anyone without ANC can just use an LC2i as the signal generater and line driver in one. But again, in a vehicle with ANC, this set up will result in the rumble as the signal from the factory amp is being tapped. You can tap ahead of the amp for a clear signal but it will have no volume control.
 
#19 ·
Thanks for the quick response!. Also, I was wondering. My amp obviously has a remote knob, it looks like the pac pro has a remote knob and the overdrive has a remote. Seems redundant? Which ones do I actually need if I’m doing the full set up. Thanks.
 
#21 ·
Hi-

I just purchased a 2018 Jeep GC High Altitude. I am currently in the process of figuring out whether to disable the mics for ANC or to follow the PAC AMP PRO (LOC, or something similar) in conjunction with the OVERDRIVE Line Driver. I was told by using a PAC harness the setup works, but there is loss of Brake Alarm, etc. (does that etc. include the blindside detection beeping, front and rear alerts when approaching an object and so forth and so on?!). I have the 19-speaker HK setup. Anyone who has either disconnected the mics or have taken a route of: PAC AMP PRO -> OVERDRIVE -> Amplifier method, can you give feedback on whether or not these safety features are still fully functional or not? Any help would be greatly appreciated. Thanks so much.

BTW, I am dropping a JL 13.5 w7 with a 1200HD/1 mono amp in this beast.
 
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top