Stereo help...😬😬
Thread Starter
Burning Brakes
Joined: Sep 2008
Posts: 826
Likes: 12
From: Phoenix, AZ
Stereo help...😬😬
Hello,
I ran an amp and two 12" pioneer shallow mount speakers in boxes through the high level inputs on the rear side speakers. Long story short getting a loud constant feed back noise when I hit the accelerator pedal. After trouble shooting, I narrowed it down the the closure of the rear hatch. When it is cracked no feed back. Anyone know what changes when the hatch is closed and which wire would I need to insulate or what I need to do?
Thank you,
I ran an amp and two 12" pioneer shallow mount speakers in boxes through the high level inputs on the rear side speakers. Long story short getting a loud constant feed back noise when I hit the accelerator pedal. After trouble shooting, I narrowed it down the the closure of the rear hatch. When it is cracked no feed back. Anyone know what changes when the hatch is closed and which wire would I need to insulate or what I need to do?
Thank you,
Drifting
Joined: Oct 2017
Posts: 1,998
Likes: 324
From: North Carolina
Hello,
I ran an amp and two 12" pioneer shallow mount speakers in boxes through the high level inputs on the rear side speakers. Long story short getting a loud constant feed back noise when I hit the accelerator pedal. After trouble shooting, I narrowed it down the the closure of the rear hatch. When it is cracked no feed back. Anyone know what changes when the hatch is closed and which wire would I need to insulate or what I need to do?
Thank you,
I ran an amp and two 12" pioneer shallow mount speakers in boxes through the high level inputs on the rear side speakers. Long story short getting a loud constant feed back noise when I hit the accelerator pedal. After trouble shooting, I narrowed it down the the closure of the rear hatch. When it is cracked no feed back. Anyone know what changes when the hatch is closed and which wire would I need to insulate or what I need to do?
Thank you,
Thread Starter
Burning Brakes
Joined: Sep 2008
Posts: 826
Likes: 12
From: Phoenix, AZ
Thread Starter
Burning Brakes
Joined: Sep 2008
Posts: 826
Likes: 12
From: Phoenix, AZ
Drifting
Joined: Oct 2014
Posts: 1,733
Likes: 403
From: Atlanta, GA
the Bose system has some noise cxl input...theres a wire under the rear floor..bose amp area. I believe if you disable the noise cxl, this 'could' help.
Pretty certain an add-on amps require us to disable this.f
I'm not an expert tho...just going off of all the "adding subwoofer" threads recently.
Pretty certain an add-on amps require us to disable this.f
I'm not an expert tho...just going off of all the "adding subwoofer" threads recently.
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Drifting
Joined: Nov 2013
Posts: 1,522
Likes: 491
From: Southern California
As I recall their is a microphone on each B pillar that monitors ambient noise and the Bose system generates out of phase sounds to reduce the cabin noise level. I think the speakers that you are using as your source are part of that system, if so, you’ve thrown the system out of balance, hence your problem, the system is fighting itself.
Look, I really am on thin ice here, I ran across this information on another thread while researching replacement of the front door speakers and the OEM subwoofer. My take away was don’t mess with the microphones or the fill speakers unless you know what you are doing. I’m sure that there are many folks on the forum that have WAY more knowledge on the topic. My advice is to do more research and see if my observations are relevant to your situation.
Look, I really am on thin ice here, I ran across this information on another thread while researching replacement of the front door speakers and the OEM subwoofer. My take away was don’t mess with the microphones or the fill speakers unless you know what you are doing. I’m sure that there are many folks on the forum that have WAY more knowledge on the topic. My advice is to do more research and see if my observations are relevant to your situation.
Last edited by Guard Dad; Apr 14, 2019 at 01:46 PM.
E-Ray, 3LZ, ZER, LIFT
Joined: Sep 2007
Posts: 34,842
Likes: 12,285
From: NE South Carolina
^^
Good question!! Love solutions that assume far more than you would naturally know. Where is it and if you can’t take a pic than a clear description of the location would be helpful.
Reminds me of iPhone solutions that assume you know how to get to the third step where they start!
Good question!! Love solutions that assume far more than you would naturally know. Where is it and if you can’t take a pic than a clear description of the location would be helpful.
Reminds me of iPhone solutions that assume you know how to get to the third step where they start!
Last edited by JerryU; Apr 15, 2019 at 04:12 AM.
Burning Brakes
Joined: Sep 2017
Posts: 1,068
Likes: 253
NAV-TV GM650 -> DSP -> Amplifiers -> new speakers.
PAC has an interface you can use instead of the NAV-TV but it seems people have been having the best results with the NAV.
The OEM Bose system does a bunch of frequency/volume manipulation based on ambient noise, engine speed, how loud you have the stereo volume set, etc. The entire Bose setup is designed to work together. Change out one part and you will get weird results. Using the NAV takes all that away, you get a clean unadulterated signal.
I just finished my install. Compared to the original Bose, well, try driving a Yugo and then a Z06. Notice a difference?
PAC has an interface you can use instead of the NAV-TV but it seems people have been having the best results with the NAV.
The OEM Bose system does a bunch of frequency/volume manipulation based on ambient noise, engine speed, how loud you have the stereo volume set, etc. The entire Bose setup is designed to work together. Change out one part and you will get weird results. Using the NAV takes all that away, you get a clean unadulterated signal.
I just finished my install. Compared to the original Bose, well, try driving a Yugo and then a Z06. Notice a difference?
Safety Car
Joined: Jul 2018
Posts: 4,303
Likes: 2,055
From: Margate, FL
The OEM Bose system does a bunch of frequency/volume manipulation based on ambient noise, engine speed, how loud you have the stereo volume set, etc. The entire Bose setup is designed to work together. Change out one part and you will get weird results. Using the NAV takes all that away, you get a clean unadulterated signal.
M650-GM - NAV-TV
AX-DSP-MOST1
AP4-GM61
Melting Slicks
Joined: Mar 2001
Posts: 2,663
Likes: 847
From: New Jersey
You must disconnect the two noise cancellation microphones. The 2 wires are easily cut, or removed at the connector at the Bose amp, under the cargo floor panel. The below post shows how to do this.
https://www.corvetteforum.com/forums/c7-tech-performance/3732274-how-to-install-a-sub-amp-from-start-to-finish.html
https://www.corvetteforum.com/forums/c7-tech-performance/3732274-how-to-install-a-sub-amp-from-start-to-finish.html
Last edited by ersatz928; Apr 15, 2019 at 07:45 PM.
Drifting
Joined: Oct 2017
Posts: 1,998
Likes: 324
From: North Carolina
You must disconnect the two noise cancellation microphones. The 2 wires are easily cut, or removed at the connector at the Bose amp, under the cargo floor panel. The below post shows how to do this.
https://www.corvetteforum.com/forums...to-finish.html
https://www.corvetteforum.com/forums...to-finish.html
Safety Car
Joined: Feb 2006
Posts: 4,541
Likes: 385
From: Fort Worth Texas
Instructor
Joined: Nov 2018
Posts: 133
Likes: 35
From: Detroit Area
Well, reading all these post on noise cancellation problems, I decided it is not worth trying to add reverb for just a few songs, well maybe several. I was going to use the back speakers for the reverb unit. I would have to disconnect them, use the feeds to go to a L.O.C., to bring the levels down then the output of the L.O.C. to the reverb unit, then the output of the reverb has to go to the input of another amp, then out put that to the 2 back speakers. This would have been a new all electronic unit no springs. Yes, reverb is not for every one. Not for every song. But for some it does work. It took me a while to find a new reverb out there for a car. As they still make hundreds of different kinds for the stomp pedals for guitars. I can only imagine the problems of what the sound would sound like, trying to fight itself with the noise cancellation. Here is the URL for the new unit and in one of the pictures in the listing they show the simple schematic, and the output has to go to an amplifier. https://www.ebay.com/itm/Color-Bar-P...UAAOSwuMRb-3IB