JH1973

The audio common is the inverted signal on a balanced input.Unlike unbalanced inputs where there is basically a shield and a signal, a balanced input has a hot signal and also an inverted signal that is completely out of phase with the hot signal. The inverted signal is also known as the audio common.

If you take that to a dealer to have the problem fixed be sure to pull all of your audio gear and cover up those wire splices as good as you can because you have voided the electrical warranty and possibly the entire vehicle warranty by splicing into the wiring.

Not only are people hesitant but even Crutchfield recommends not replacing the factory head unit in many vehicles now.Aftermarket HU's are going to be a thing of the past soon unless these companies like Pioneer,Kenwood,etc start figuring out how to integrate into factory systems.Problem is that the technology is so complex and therefore too expensive to make it available to the average consumer.

Both the AmpPro and NavTV Zen units act as virtual replacements of the stock Bose amplifier. Neither of the units use the "post amp" Bose signal but rather they use the actual CanBus(MOST serial data) signals that come from the stock source unit. The modules convert the data signals into analog full range line level RCA signals usable for most aftermarket amplifiers. I was curious about that myself so I did some research and looked at some random late model Sierra diagrams in my database.I checked the connectors that the AmpPro uses at the stock source unit.It uses 2 of the connectors at the SU,both of which contain the MOST serial data and the other important low speed GMLAN data signals.The question is which module has higher quality inner components and reliability between the AmpPro and Zen units?

I would like to thank you guys on this thread that have given me good reviews(I'm John-1pocket). I'm very humbled by your comments and am extremely grateful that you've given me a chance to help you out. My preferred contact email is [email protected] but if you are having issues with that address then try [email protected] I know in the past you've read some guys say they've received their order very quickly and sometimes that was the case.However,in recent months my business has really grown and I'm typically not able to deliver so quickly.I don't scratch people's ears,I tell them the truth as I work a full time job(50+ hours a week) and do this harness business on the side so sometimes things can get a bit backed up.But know this,when you order a harness from me you will always get an honest lead time. Feel free to ask me any questions here and I'll do my best to answer so that it may benefit the whole group.

The Fix86 is certainly a fine choice but by no means a "must" for Non-Bose systems.Many have ran their stock speaker signals straight into the speaker level inputs of a 4ch amplifier and used the RCA passthrough to feed signal to their mono bass amp yielding fantastic results.

That NavTV unit is only going to work on a factory Bose system.It replaces the stock amp basically.The I0R base system has completely different connectors and wiring configurations.

You could send the Ethernet bus signals and low speed gmlan data circuit into a Bose amplifiers X4 connector on the proper pin locations but the issue is that the Bose amp doesn't have the circuitry for radio controls like volume up/down....power on/off etc. I just don't see how you could get that to work,I wouldn't even try it.You're better off just upgrading what you have with aftermarket gear.

That harness will work in your truck then.

Keep in mind that if his harness is for subwoofer integration only then you'll have to cut the speaker wires in the middle of it and route them accordingly.If his harness is already set up for doing a full system then you're good to go.

It will work if you have the IOR infotainment system.There are 5 other system types(IO5-IO6-IOB-IOS-IOU) and if you have one of them then his harness will not work.

You can use a DSP or an LC7i but do not use both as that is completely unnecessary.DSP's typically have high level inputs and can do vastly more with the incoming signal.

Awesome! Glad you got it sounding the way you want or at least close enough.I tell people all the time that once you experience a DSP's capabilities(time alignment,Xovers,PEQ,etc) you will NEVER go back to passive again.When those vocals are coming from the center of the windshield and it seems as if your dashboard is a stage it just takes car audio to the next level!

With your setup only thing I can think is to go into the DSP and use the GEQ or PEQ to cut higher frequencies down where it's not so piercing.

Ok,I'm not totally familiar with all the different trims and such for the GM trucks.I have access to all the schematics on them and build audio harnesses for people wanting to add aftermarket audio gear.That being said the people with Bose factory systems actually have it tougher when wanting to upgrade because of all the processing that Bose amp does.That's why I am steering people that want to do an all out upgrade(doors,dash and subs) to the NavTV Zen unit that transforms the MOST serial data into full range line level RCA outputs.They are clean,full range signals that you can build a solid system off of. But for people with the Bose systems that just want to add a subwoofer amp and sub that NavTV unit is way overkill.They can simply use the post Bose amp sub signal and they're fine.Now people with Non-Bose systems are actually in the best boat for adding aftermarket gear because the signals are not processed and can be sent into any line converter,DSP or high level amplifier inputs and come out with good results.