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I recently upgraded the head unit in our '06 Z06 to the Alpine iLX-407 and added a backup camera and new Sirius XM tuner at the same time. I did not want to swap out the original speakers or the Bose amp. I used the AXDI-CL2 wiring harness from AXXess Integrate. I wired in RCA's to the speaker leads on the harness and plugged them in to the low-level outputs of the new head unit. I thought everything sounded great in the driveway until I drove it next. When I am sitting still and idling, there is a slight whining noise over the audio, but it is quickly drowned out when you turn the audio up to a normal level. However, when you actually drive the car, the whining noise increases with speed. You can't hear it if you turn the radio up loud enough, but at that level you can't talk to anyone in the car with you. Has anyone else had a similar issue or know what I need to do to eliminate the interference?
Whining that matches the rpm's of the car is a classic symptom of a ground loop. Generally resolved by redoing any grounding wires you installed, common if you ground your audio stuff in multiple locations. I've had this issue with RCA cables too if they're bad/poor quality. Do you have any pictures of how you wired the RCAs to the speaker leads?
Whining that matches the rpm's of the car is a classic symptom of a ground loop. Generally resolved by redoing any grounding wires you installed, common if you ground your audio stuff in multiple locations. I've had this issue with RCA cables too if they're bad/poor quality. Do you have any pictures of how you wired the RCAs to the speaker leads?
Linear noise that fluctuates with the rpm is a classic symptom of audio/electrical interference. Those are good suggestions
Whining that matches the rpm's of the car is a classic symptom of a ground loop. Generally resolved by redoing any grounding wires you installed, common if you ground your audio stuff in multiple locations. I've had this issue with RCA cables too if they're bad/poor quality. Do you have any pictures of how you wired the RCAs to the speaker leads?
Since I intended to just swap out the head units, I didn't do any additional grounding. I just wired the black from the new unit to the black on the wiring harness...literally just pulled the old unit out and plugged the new one in... The RCA's weren't super expensive (JL Audio XD-CLRAIC2-SW Speaker Wire to RCA Cable), but they were new, and labeled with pos/neg so I made sure to keep the phasing correct. I didn't take pictures of the install (that would have been smart), but I just wired each front/rear and left/right of the wiring harness to the new RCA plugs, and then connected them to the low-level outputs from the new head unit. I wrapped the high-level speaker outputs from the head unit and left them disconnected to anything else.
Did you use the correct wiring harness? The model you mentioned seems AXDI-CL2 is for non-amplified systems, which does not apply to the Corvette.
I thought so. The description on that model is the same as on their others when I searched for what fit the car. It has an amp signal lead (which I connected). I don't have factory remote steering controls, bluetooth, or Onstar.
Last edited by brains904; Jun 18, 2022 at 02:54 PM.
I thought so. The description on that model is the same as on their others when I searched for what fit the car. It has an amp signal lead (which I connected). I don't have factory remote steering controls, bluetooth, or Onstar.
Got this from their website. Look at the bold lettering and then the numbers 1 and 2.
Used in non-amplified systems or when replacing amplified systems
Retains all warning chimes through onboard speaker
Pre-wired AXSWC harness (AXSWC sold separately)
Low profile case
Retain audible blind spot detection system
Micro-B USB updatable
(1) These vehicles have a digital amplifier option. Please reference the Service Parts Identification sticker located in the glove box for the RPO code UQA. If UQA is present then the vehicle is equipped with a digital amplifier. Either use the AX-GMCL2-SWC or bypass the amplifier.
(2) These vehicles have a digital amplifier option. Please reference the Service Parts Identification sticker located in the glove box for the RPO code Y91. If Y91 is present then the vehicle is equipped with a digital amplifier. Either use the AX-GMCL2-SWC or bypass the amplifier.
(3) These vehicles are standard for a digital amplifier. Either use the AX-GMCL2-SWC or bypass the amplifier.
In their description for vehicle applications, they list the Corvette but with no number next to it to indicate it has an amplifier. All C6's have an amplifier, and that includes car with and without Bose.
In their description for vehicle applications, they list the Corvette but with no number next to it to indicate it has an amplifier. All C6's have an amplifier, and that includes car with and without Bose.
Chevrolet
Avalanche 2003-2006 (2)
Cavalier 2000-2005
Colorado 2004-2012
Corvette 2005-2013
Express 2003-2007
Impala 2000-2005
Thank you. So if I swap it out for the AX-GMCL2-SWC wiring harness, will I still need to use the low-level outputs from the new head unit since I'll still be using the factory Bose amp?
Thank you. So if I swap it out for the AX-GMCL2-SWC wiring harness, will I still need to use the low-level outputs from the new head unit since I'll still be using the factory Bose amp?
I just gave the instructions a quick look, but it appears you will connect the speaker wires to the interface/wiring harness and the the interface will convert the signal to a pre-amp signal to send to your amplifier. I used the Pac Audio RP5-GM11 interface and it works the same way.
I just gave the instructions a quick look, but it appears you will connect the speaker wires to the interface/wiring harness and the the interface will convert the signal to a pre-amp signal to send to your amplifier. I used the Pac Audio RP5-GM11 interface and it works the same way.
+1
Originally Posted by Carvone
Did you run all the wires down the same side? You need to run the power wires down one side and the speaker wires down the other.
Correct, if wiring from scratch, however here, it seems he should be using a wiring harness to connect the radio to the car (it wires together), then to the existing car's wiring, will wire right into harness, which wired to radio (you will NOT be using the pre-amp outputs of the radio). There should be no interference with this particular configuration, since you'll effectively be using existing wiring.
I think Fred is spot on here, I think that's the wrong interface for your car. If you swap out to the AX-GMCL2-SWC you DO NOT use the low level RCA outputs from your amp, you connect the speaker wires from the head unit to the corresponding wires on the interface for the Bose system. If you were to remove the Bose system and add other amplifiers, then you'd use the RCA outputs.
I think Fred is spot on here, I think that's the wrong interface for your car. If you swap out to the AX-GMCL2-SWC you DO NOT use the low level RCA outputs from your amp, you connect the speaker wires from the head unit to the corresponding wires on the interface for the Bose system. If you were to remove the Bose system and add other amplifiers, then you'd use the RCA outputs.
Originally Posted by TorchRedFred
I just gave the instructions a quick look, but it appears you will connect the speaker wires to the interface/wiring harness and the the interface will convert the signal to a pre-amp signal to send to your amplifier. I used the Pac Audio RP5-GM11 interface and it works the same way.
So, basically, I need to learn how to read better? I'm not sure how I overlooked the appropriate wiring harness to use, but nevertheless, thank you all for your help. I'll swap it out and report back. Thanks again
The RP5-GM11 is a good interface but isn't emmune from problems, there're a few people on here, including myself, that have had issues with them, but for the most part it tends to be the "goto" interface on this forum, and the ones that have gone bad are few and far between. PAC recently came out with their latest revision of this interface and so far I haven't heard of any going bad yet, this is what their latest version looks like. https://www.crutchfield.com/S-eayi5A...445990cc719016
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Head Unit Upgrade Issues
Linear noise that fluctuates with the rpm is a classic symptom of audio/electrical interference. Those are good suggestions
I'm not sure how I overlooked the appropriate wiring harness to use, but nevertheless, thank you all for your help. I'll swap it out and report back. Thanks again
Glad to help, let us know how things turn out, or if you have any other issues.
