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Active noice cancelling and changing speakers

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blu3s94

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I have a 2019 ram 2500 6.4 with 400 miles on it. Last night I changed the 4 door speakers to alpine type E 6x9 at 4 ohms.


This morning going to work the truck had a horrible droning noise around 2k rpm in all gears. AT FIRST I suspected MDS, however my exhaust is stock and when I put the truck in gear 8 to disable MDS it doesn't make it go away. The noise is so bad its giving me a headache to drive it.


Could changing the speakers have done something? Not really up to speed on all the new features on this truck. Saw somewhere about the noise cancelling.


Only other thing I have done is spray fluid film to the undercarriage a week ago. The noise happened to start immediately after the speaker swap however.... somebody help.

Sent from my SM-G960U using Tapatalk
 
Just checked under my driver seat and the ANC amp isn't there. But I have the mics in the headliner and my build sheet says I have ANC. Where did they move the amp too??!

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Just to let everyone know I put the factory speakers back in and the annyoing drone is completely gone. Really sucks, have all this $ in aftermarket equipment that I can't use.

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That really sucks. Could you tell if the sound was coming directly from the speakers?
 
No it wasn't obvious. But like I said, It started immediately after installing the speakers. And when I went back to stock it was gone. It sounded like a honda civic with no muffler. That kind of drone. Very loud in the cab and annoying.




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Any possibility new speakers magnets were against the door causing a vibration at speeds or rpms? Those alpine should be deeper than factory.
 
No they weren't. They looked identical depth but I used 1/4" spacers anyways.

Noise was coming with the radio off

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Did the sound level increase with speed, or click, or make any other noises at all? Sounds like a loose ground on an amp, or alternator. The amp ground wires may not be grounded to bare metal and not achieving a proper contact.
 
I know this is old thread, but there are companies that make a bypass cable for the ANC the requires no cutting to factory wiring. Of course you’ll lose ANC. But if you got good speakers, who cares?
 
More info? I never found a solution to my problem. Still have the speakers waiting to install.

I don't have an anc amp under my driver seat like others do.

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If you just want to test it you can pull the fuse for your ANC / amplifier and go drive it around. Your speakers wont work at all with the fuse pulled but it will get you to the root cause. If the noise goes away then its your ANC.
 
I have not replaced my factory speakers yet, but I did have to bypass the ANC with the cable from PAC Audio. The ANC module was located by the parking brake pedal. This is the location if you do not have factory amplifier. The reason I had to bypass, severe tinnitus after driving all day. Could not think straight with the ringing in my head. 600+ miles a day with my job. Next I will concentrate on making the stereo sound better for the next 400k miles.
 
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Makes my think this ANC should be optional (from the uConnect menus). I don't mind it on short travels, but for a full day of driving, that might be too much.

I reckon some people can't stand ANC headphones at all. Causes headaches.
I do use my ANC headphones every time I fly but in any other environment, I can't stand them. So, it's basically taking the least worse of two bad solutions.

I have yet to use a RAM with ANC beside the short road trials at the dealer. We'll see.
 
SQUATCH said:
Maybe this link is helpful?
Click above, it’s for that bypass I was talking about.
Click to expand...
Thanks for that. 7 months ago I only saw it being under the drivers seat. I couldn't understand where mine was at!

I still have the speakers sitting in my garage, I may order this and see if it works. It blows my mind that simply swapping speakers creates a problem. It sucks the only solution is losing anc completely.

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Hi, I have 2019 6.7 tradesman. No anc module under driver seat. I swapped all the speakers to Kicker. I noticed the Metra harnesses that crutchfield sent were not the same polarity as the oem wiring so I repinned all of them before I installed the new speakers. I don't notice any drone at all. I'm not even sure if my truck has ANC. Maybe try checking the polarity and putting the speakers back in?
 
I've worked in commercial Audio Video for the past 25 years, and might be able to lend a little insight. Not 100% sure which trim level you have or if you even have ANC or not, but if you have ANC, there is a chance that the ANC is tuned to the factory speakers in the truck. Polarity would only matter if the polarity was mis-matched in the speakers, biased from front to back, or left to right for example.

More info for geeks:
Most likely there is no active monitoring of the noise that is being generated by the truck (meaning that it wont auto-adjust on the fly), but an algorithm of "how much noise a truck generates at X speed" and the audio system outputs a "counter" noise to offset it, resulting in lower perceived noise inside the cab, and teh microphones in the truck are being used to determine if the windows are open, resulting in a little bump in volume of the ANC. IMHO changing the speakers in the truck, that are not tuned the same way that the factory speaker are, could have an adverse affect on the ANC, especially if the aftermarket speakers don't have the exact frequency response specification of the factory models. For example, some speakers are meant to be used with subwoofers, therefore, they have crossovers that dont allow them to pass low frequencies to them so the sub can work best at what it does, others are full range, allowing for low/mid/high to pass though them. If you don't match the speakers with exactly what was installed by the factory, you could have issues, such as hearing the ANC doing its job of sending the "droning noise" that you are hearing. What it sounds like to me is happening is that you installed full range speakers. that are passing the lower frequencies and hearing the droning that should be only heard by the subs. If you are insistent on using these speakers, you could try installing a crossover, that eliminates all frequencies below say 100hz or 80hz (not sure what Ram uses for their spec), This might make your droning go away.
 
jpidgie said:
I've worked in commercial Audio Video for the past 25 years, and might be able to lend a little insight. Not 100% sure which trim level you have or if you even have ANC or not, but if you have ANC, there is a chance that the ANC is tuned to the factory speakers in the truck. Polarity would only matter if the polarity was mis-matched in the speakers, biased from front to back, or left to right for example.

More info for geeks:
Most likely there is no active monitoring of the noise that is being generated by the truck (meaning that it wont auto-adjust on the fly), but an algorithm of "how much noise a truck generates at X speed" and the audio system outputs a "counter" noise to offset it, resulting in lower perceived noise inside the cab, and teh microphones in the truck are being used to determine if the windows are open, resulting in a little bump in volume of the ANC. IMHO changing the speakers in the truck, that are not tuned the same way that the factory speaker are, could have an adverse affect on the ANC, especially if the aftermarket speakers don't have the exact frequency response specification of the factory models. For example, some speakers are meant to be used with subwoofers, therefore, they have crossovers that dont allow them to pass low frequencies to them so the sub can work best at what it does, others are full range, allowing for low/mid/high to pass though them. If you don't match the speakers with exactly what was installed by the factory, you could have issues, such as hearing the ANC doing its job of sending the "droning noise" that you are hearing. What it sounds like to me is happening is that you installed full range speakers. that are passing the lower frequencies and hearing the droning that should be only heard by the subs. If you are insistent on using these speakers, you could try installing a crossover, that eliminates all frequencies below say 100hz or 80hz (not sure what Ram uses for their spec), This might make your droning go away.
Click to expand...

That is simply not possible. You need mics to cancel the actual noise, not just to adjust the level.
If you add sampled noise (or counter noise like you call it) randomly to the cab, you will be exactly doing that: adding new noise to cab and increase the overall noise level.

The only possible way to remove noise is to output the same noise but in the opposite polarity. That will have the effect to create a "zero" sound or noise cancellation.
And your counter sound need to be perfectly sync with the noise you want to eliminate or you will simply add this noise to ambient noise. In order to do that, mics are required.
For example, if you had sampled the exact noise of your truck and output it just 180deg out of phase (from the "cancel" phase), you would actually double the noise level in the cab.

An ANC has a DSP chip that will sample the ambient noise, determine what is required to be cancelled (basically looks for the repetitive noise), sync on it and then output the opposite phase noise.
 
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Mike, good argument, however, the ANC in our trucks is not intelligent. I installed a new lift and MTR (ish) tires last week. If the ANC was active and listening as you claim, there would have been a considerable reduction of in-cab noise, and there isn't, there is a considerable increase of noise in the cab, something that an intelligent, monitored ANC system would be able to easily overcome. Same thing goes when the windows are open... no ANC gains are noticed. Of course, I'm only speaking hypotheticals based on what I work with daily.
 
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