Aftermarket Amplifier Harness?

6APPEAL

Member
42
10
8
Deep South
Buick Ownership
2019 Regal TourX 1987 Grand National
Really just depends on what you want as the final result. I want to bypass everything the factory put in the Bose system (crossovers, eq, dsp, noise cancellation), retain OnStar, door chimes, Bluetooth voice calls and just get a clean full range signal that I can add Hi-res audio to. If I wasn't interested in adding Hi-res audio, the Audio Control or JL Audio OEM Intergration products would work perfectly.
 

Irock1985

Active member
120
30
28
Buick Ownership
2018 Buick Regal
Really just depends on what you want as the final result. I want to bypass everything the factory put in the Bose system (crossovers, eq, dsp, noise cancellation), retain OnStar, door chimes, Bluetooth voice calls and just get a clean full range signal that I can add Hi-res audio to. If I wasn't interested in adding Hi-res audio, the Audio Control or JL Audio OEM Intergration products would work perfectly.
I forget who I'm speaking to lol.... I wonder is that NAVTV in reality better than using audio summing? Or is just that you're after that optical connection?

Anyways... Because of budget BestBuy will have the honor of figuring my stuff out on the 29th lol. Audio shops aren't very enthusiastic about trying to figure out my car or making sure all the stuff will be compatible with the engine start-stop feature
 

6APPEAL

Member
42
10
8
Deep South
Buick Ownership
2019 Regal TourX 1987 Grand National
Actually, the optical connection cannot carry handle the bandwidth of Hi-res audio. I will be using the SPDIF output connection for digital stereo signal into the Helix Pro MKII. The Helix will get also handle the Hi-res audio input from the Onyko app on my phone via a USB data connection. With the Helix I will have complete control over the audio signal to feed the amps then speakers.

I talked with a car audio professional friend of mine. He believes the Bose system in my TourX is the same Infotainment 3 system in the majority of the Premium Audio systems in 2019 GM vehicles. He's pretty sure it is based on a MOST-150 system which increases the frame length up to 3072 bits, which is about 6 times the bandwidth of MOST-25 and 3 times the bandwidth of the MOST-50 systems it replaces. He said they just completed a 2019 Camaro with an Infotainment 3 Bose system and it was a PITA to find and research the system to figure out just what they could do and how to do it.

As far as audio summing, I've heard some very nice sounding systems at MECA/ISACA SQ contests that used either the Audio Control or the JL product. Which is better???? I don't know. I've heard both. I have a friend, Toby, with a very nice 2017 Mustang that is using the JL Audio Fix-86 to sum the Ford Premium audio system. The system is very simple, but sounds great. A pair of nice 2 channel amps (75x2) with one running a nice passive 6.5" two way with woofer in factory door location and a custom mount for the tweeter on the A-pillar. The other amp runs a pair of 8's in a ported enclosure. Not stupid loud, just very clean and dynamic sounding. And the big thing is he is only using the factory head unit which shows just how good the JL FiX-86 is at fixing all the factory junk.

My buddy Toby's system is pretty much what I'm looking for, a clean, dynamic, realistic sounding system. I haven't fully decided on a 2 way front or a 3 way front, but will most likely start with a 6.5" two way front run actively. Haven't decided on the sub, since I need to figure out how much air space I have in the spare tire well since I plan on keeping the sub under the cover.
 

Irock1985

Active member
120
30
28
Buick Ownership
2018 Buick Regal
Actually, the optical connection cannot carry handle the bandwidth of Hi-res audio. I will be using the SPDIF output connection for digital stereo signal into the Helix Pro MKII. The Helix will get also handle the Hi-res audio input from the Onyko app on my phone via a USB data connection. With the Helix I will have complete control over the audio signal to feed the amps then speakers.

I talked with a car audio professional friend of mine. He believes the Bose system in my TourX is the same Infotainment 3 system in the majority of the Premium Audio systems in 2019 GM vehicles. He's pretty sure it is based on a MOST-150 system which increases the frame length up to 3072 bits, which is about 6 times the bandwidth of MOST-25 and 3 times the bandwidth of the MOST-50 systems it replaces. He said they just completed a 2019 Camaro with an Infotainment 3 Bose system and it was a PITA to find and research the system to figure out just what they could do and how to do it.

As far as audio summing, I've heard some very nice sounding systems at MECA/ISACA SQ contests that used either the Audio Control or the JL product. Which is better???? I don't know. I've heard both. I have a friend, Toby, with a very nice 2017 Mustang that is using the JL Audio Fix-86 to sum the Ford Premium audio system. The system is very simple, but sounds great. A pair of nice 2 channel amps (75x2) with one running a nice passive 6.5" two way with woofer in factory door location and a custom mount for the tweeter on the A-pillar. The other amp runs a pair of 8's in a ported enclosure. Not stupid loud, just very clean and dynamic sounding. And the big thing is he is only using the factory head unit which shows just how good the JL FiX-86 is at fixing all the factory junk.

My buddy Toby's system is pretty much what I'm looking for, a clean, dynamic, realistic sounding system. I haven't fully decided on a 2 way front or a 3 way front, but will most likely start with a 6.5" two way front run actively. Haven't decided on the sub, since I need to figure out how much air space I have in the spare tire well since I plan on keeping the sub under the cover.
Figured you'd want a component system to replace the factory tweeters since you're going to have all that control
______________________________
 

6APPEAL

Member
42
10
8
Deep South
Buick Ownership
2019 Regal TourX 1987 Grand National
When I said two way, I meant components which is just kind of understood in the SQ world. Already priced out the replace panels for the tweeter and the A-pillar. Not sure which direction I'm going to go yet. I usually like to play with driver positioning before making a final decision. A DSP is a powerful tool, but can't completely fix bad speaker placement.
 

Irock1985

Active member
120
30
28
Buick Ownership
2018 Buick Regal
When I said two way, I meant components which is just kind of understood in the SQ world. Already priced out the replace panels for the tweeter and the A-pillar. Not sure which direction I'm going to go yet. I usually like to play with driver positioning before making a final decision. A DSP is a powerful tool, but can't completely fix bad speaker placement.
Yeah your going top tier SQ lol I'm going budget mid range SQ hahahaha.... I enjoy good audio but my wallet (and moreso my wife) has its limits

I'm just hoping the Audio Control LC 4.800 is worth the $300 premium over my initial choice of the Kicker Key180. (Also had considered the Kicker IQ line for it's DSP around the same price as the Audio Control but then I'd still need another LOC for my subs so I went with install simplicity over SQ I guess lol 🤷‍♂️🤷‍♂️🤷‍♂️

It may have been a different choice if we knew for sure how the stock radio is manipulating the audio.
 

g-coded

Member
49
17
8
Buick Ownership
2018 Regal Sportback
Since I was getting nowhere with "official" support, I decided to order the Axxess AX-DSP Harness from Best Buy. I picked it up yesterday and tested fitment out earlier.
I have good news and bad news, the female plug fit into the wiring perfectly, and the front left speaker wire matches what @Irock1985 found, but the male wouldn't snap into place in the head unit. It looks like there is a tab in the head unit jack that fits into the wiring harness clip. The stock wiring has a cutout for this, but the Axxess plug doesn't. I can/will cut this out of the tab to get it to fit after I confirm the speaker pigtail works, which I could have tested, but after fumbling with the connectors in 106* weather I was happy just to have pictures and a plan to move forward.
A tip to help get the stock wiring plug out, I used a flat head screwdriver through the loop on the retainer clip to push the tab down(lifting up against the loop). Also, put a towel or something over your weather striping, I pulled the rubber off a couple of the clips and it looks like they will break if I pop them out.

1626316264
 

Irock1985

Active member
120
30
28
Buick Ownership
2018 Buick Regal
Since I was getting nowhere with "official" support, I decided to order the Axxess AX-DSP Harness from Best Buy. I picked it up yesterday and tested fitment out earlier.
I have good news and bad news, the female plug fit into the wiring perfectly, and the front left speaker wire matches what @Irock1985 found, but the male wouldn't snap into place in the head unit. It looks like there is a tab in the head unit jack that fits into the wiring harness clip. The stock wiring has a cutout for this, but the Axxess plug doesn't. I can/will cut this out of the tab to get it to fit after I confirm the speaker pigtail works, which I could have tested, but after fumbling with the connectors in 106* weather I was happy just to have pictures and a plan to move forward.
A tip to help get the stock wiring plug out, I used a flat head screwdriver through the loop on the retainer clip to push the tab down(lifting up against the loop). Also, put a towel or something over your weather striping, I pulled the rubber off a couple of the clips and it looks like they will break if I pop them out.

View attachment 16263View attachment 16264
Same temp here in Cali so I feel you on the heat!

Nice... Looking forward to your testing. If the harness works I wouldn't need BestBuy to install and I could save myself $200 😁

Is this the one you ordered?
16265
______________________________
 

g-coded

Member
49
17
8
Buick Ownership
2018 Regal Sportback
Same temp here in Cali so I feel you on the heat!

Nice... Looking forward to your testing. If the harness works I wouldn't need BestBuy to install and I could save myself $200 😁

Is this the one you ordered?
Yep, SoCal, I picked a great time :LOL:
That is the part I ordered. Another thing to note, the harness pinout YELLOW has constant 12v coming off the OEM Green plug PURPLE/BROWN. I will test to see if this is 12v with ACC off, as I wanted to use a switched 12v to power a LOC(not sure if there is power drain even when there is no audio signal). Other promising info, is that the 'speaker side' of the harness(8 wires to right) aligns to the pinouts/pigtail, and the gap in the gap in the OEM plug pinouts are unrelated to the audio/power.

Anyone know where to get a male molex micofit 43020(with wiring)? I am trying to avoid cutting the connector off and wanted to create a connector that would plug into the Axxess connector(speaker level output). I would just get the plug/pins but I despise working with molex pins, and could avoid it I found an extension cable.
 

g-coded

Member
49
17
8
Buick Ownership
2018 Regal Sportback
Any updates?
I actually came here to give an update. I was planning on doing this Saturday morning, however I have been having issues with tire balance with my car. I have taken it to get the wheels balanced, and as soon as I get it to freeway speeds the shaking returns. I have an appointment to bring my car in Saturday morning, and it sounds like they will have the car most of the day. I also had plans to tint the windows, but with this issue I don't want to put any money into the car at the moment. I will still test the speaker input on the harness, and report back as soon as I can(Sunday?).
______________________________
 

Irock1985

Active member
120
30
28
Buick Ownership
2018 Buick Regal
I actually came here to give an update. I was planning on doing this Saturday morning, however I have been having issues with tire balance with my car. I have taken it to get the wheels balanced, and as soon as I get it to freeway speeds the shaking returns. I have an appointment to bring my car in Saturday morning, and it sounds like they will have the car most of the day. I also had plans to tint the windows, but with this issue I don't want to put any money into the car at the moment. I will still test the speaker input on the harness, and report back as soon as I can(Sunday?).
Hmmm.... A few days ago I was experiencing a strange wobble. Happened for a few seconds and then went away. I wasn't sure if it was the car or the street. Definitely keep me posted if they find anything.
 

g-coded

Member
49
17
8
Buick Ownership
2018 Regal Sportback
Hmmm.... A few days ago I was experiencing a strange wobble. Happened for a few seconds and then went away. I wasn't sure if it was the car or the street. Definitely keep me posted if they find anything.
This is a constant wobble/shake at anything above 45mph, and increasing with speed. The car is being left at the dealer as they 'tried' rebalancing the tire(claiming the tire shop did a poor job) but were left with 'slightly better'. They mentioned the 'specialist' wasn't there on Saturdays but he would be there to look at it on Monday, so I left the car there to pick up Monday night. So, no update on the harness for at least a couple days.
I'm not sure how a tire can't be balanced(not bent/damaged), and I'm thinking it could be an alignment issue or worse(?).
 

Irock1985

Active member
120
30
28
Buick Ownership
2018 Buick Regal
This is a constant wobble/shake at anything above 45mph, and increasing with speed. The car is being left at the dealer as they 'tried' rebalancing the tire(claiming the tire shop did a poor job) but were left with 'slightly better'. They mentioned the 'specialist' wasn't there on Saturdays but he would be there to look at it on Monday, so I left the car there to pick up Monday night. So, no update on the harness for at least a couple days.
I'm not sure how a tire can't be balanced(not bent/damaged), and I'm thinking it could be an alignment issue or worse(?).
Oh yeah definitely not my issue.... But very strange. You'd think even a defective rim could be balanced lol... Sounds like a control arm, CV, wheel hub type of issue to me
 

g-coded

Member
49
17
8
Buick Ownership
2018 Regal Sportback
...now where was I?

I thought taking the harness off the second time would be easier, nope.:LOL:

I was able to fully test the Axxess wiring harness(finally). I have a portable(Lepai) 20w amplifier that I hooked my phone into and used a 20hz-20khz test tone video(the high end stuff):p. Testing one speaker at a time, I can confirm that the pigtail on the harness matches the speaker that is labeled. Also, there is no frequency cutoff(beyond what the speaker can play/what I can hear), so single inputs on the front speaker mid range/tweeter. There is also a 12v constant(ACC not on), coming off the DSP plug as described in the pinout(YELLOW/BLACK). Anyone familiar with the powered LOCs know if there is auto sensing to turn itself on(not just the remote)?

Now comes the task of modifying the other end of the plug to fit.:eek:
______________________________
 

Irock1985

Active member
120
30
28
Buick Ownership
2018 Buick Regal
...now where was I?

I thought taking the harness off the second time would be easier, nope.:LOL:

I was able to fully test the Axxess wiring harness(finally). I have a portable(Lepai) 20w amplifier that I hooked my phone into and used a 20hz-20khz test tone video(the high end stuff):p. Testing one speaker at a time, I can confirm that the pigtail on the harness matches the speaker that is labeled. Also, there is no frequency cutoff(beyond what the speaker can play/what I can hear), so single inputs on the front speaker mid range/tweeter. There is also a 12v constant(ACC not on), coming off the DSP plug as described in the pinout(YELLOW/BLACK). Anyone familiar with the powered LOCs know if there is auto sensing to turn itself on(not just the remote)?

Now comes the task of modifying the other end of the plug to fit.:eek:
Nice... I believe most good LOC come with some sort of sensing though I keep seeing random post of it not working so seems like a dedicated 12v line would be best

Pics of plug modifications would be greatly appreciated 😁
 

g-coded

Member
49
17
8
Buick Ownership
2018 Regal Sportback
Just the green plug.
Nice... I believe most good LOC come with some sort of sensing though I keep seeing random post of it not working so seems like a dedicated 12v line would be best
I ordered the LC8i($30 more than the LC7i, but it comes with the bass remote), and looking at the manual it lists the remote in as "optional/unusual installation" due to the "GTO", so no worries there.
 
Last edited:

g-coded

Member
49
17
8
Buick Ownership
2018 Regal Sportback
Well, I've got good news and bad news. After hacking the harness plug to a nub(would not slide all the way in/latch), I don't think it will fit properly. However, just when I was going to give up, I decided to wire the speaker input/output together(going to use PCI 8 pin connectors on Line Out/Speaker In), and put the plug in as far as it would go and 'hold' it in place. This works! I will need to come up with a way to attach the plug more securely though. After modifying the plug to get the same result, I don't think any modification was needed to get to where I ended up:banghead:

Now the bad news. I was leaving the stock plug 'loose' so I didn't have to deal with the clip again, and discovered something, the sound was only coming from the center speaker. It turns out the stereo gets power from the grey plug(haven't tested but YELLOW/BLACK wires present), and there are two other wires on this plug(Center Channel?). I don't wan't to cut the 'center speaker' wires, but I don't want 'music' coming from this channel(need chimes/info). I haven't touched the grey plug, but I think we would need to do Input Summing for the output of this channel, and reroute it to the fronts.
 
Top