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  #1  
Old 04-27-2015, 10:03 PM
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2015 Summit aftermarket sub

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!

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  #2  
Old 04-27-2015, 11:20 PM
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Re: 2015 Summit aftermarket sub

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.
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Old 04-29-2015, 01:06 AM
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Re: 2015 Summit aftermarket sub

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.

Quote:
Originally Posted by 14SummitHemi View Post
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.
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Old 06-16-2015, 12:17 PM
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Re: 2015 Summit aftermarket sub

I was looking at Crutchfield and they state that the JL Stealthbox is not compatible with 2014/2015 Jeep grand cherokees with the Harman Kardon upgraded systems. Does the stealthbox actually work with these systems? I wonder why they list it as being noncompatable.
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Old 06-16-2015, 12:32 PM
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Quote:
Originally Posted by xfactor9169 View Post
I was looking at Crutchfield and they state that the JL Stealthbox is not compatible with 2014/2015 Jeep grand cherokees with the Harman Kardon upgraded systems. Does the stealthbox actually work with these systems? I wonder why they list it as being noncompatable.
Locked down DSP and crossover?
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Old 06-16-2015, 12:42 PM
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Re: 2015 Summit aftermarket sub

I read another post about this same thing and the resolution was to simply disconnect the microphones.
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Old 06-16-2015, 01:04 PM
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Quote:
Originally Posted by ekaz View Post
I read another post about this same thing and the resolution was to simply disconnect the microphones.
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.
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Old 06-16-2015, 03:07 PM
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Re: 2015 Summit aftermarket sub

Quote:
Originally Posted by 14SummitHemi View Post
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.
My reply was to the noise from the ANC and the aftermarket sub. As for adding a sub, the best way would be to use something like an rf 360 to sum and flatten the signal to send to an amp. Then use an LP filter to get what you want sent to the sub.
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