Tom Purser

You don’t have to have a dsp or loc if your just adding speakers and sub. Gm sells a kicker system ( 4 channel amp + mono amp and 10” sub that plugs right in IF you have the IOR radio. If you have the IOS radio then you can tie in to the FRONT speaker wire and run it to sub. Use the front because it is where the bass signal is best. If you want a full 4-7 channel system then you need an LCI or LOC to convert all 8 speaker wires to rca jacks for the amps

Yes it’s the same for 2021. The screen is just a display. The unit itself is behind the glovebox and does NOT have an amp. It has its power internally just like any base stereo does. The Bose has an external amp and it’s behind the back seat. The kicker sub alone is a perfect match for the bose system and sounds great!!! For those WITHOUT the Bose you can buy and install the kicker sub and it makes a great addition to the non Bose system as well. If you want more power then I can tell you from experience that it’s priced too high through GM. If you DO get the $1200 system from GM, MAKE SURE YOU ORDER THE ONE THAT GOES TO YOUR PARTICULAR SYSTEM!!! Some are IOS, some IOR. Give your ViN to the parts department and they can tell you which system you have.

What I have been told by the dealership parts/service people is that the only way to know which unit you have (IOR or iOS) is to give them the vin and they will tell you. Due to parts shortage and suppliers issues there has been a mix match of parts installed during build depending on availability at the time your truck came down the assembly line. I purchased the kicker sub package with extra 4 channel amp and had the dealership install it. However while doing so they found that the supplied wire harness only fits the IOR system and I had the iOS.. also found out that GM doesn’t offer a wire harness for the iOS system so I have a $1200 purchase that I can’t use. If you have the IOR system it will plug and play for you if interested I’ll sell it to you for $700

Thanks

Albert,, is your system an IOS or IOR? Who is doing your loop processor? Will it work on an IOS? Does the IOS factory system already have an amp?

Does the iOS system have an amp? I have an AT4 non Bose iOS system and the dealership tells me that I can add the kicker sub and amp to it but not the 4 channel amp. Why is that? Can I add an amp to the iOS stereo?