2021 GMC Sierra AT4 - High End Audio System - Brax, Accuton, Mosconi, Focal (Updated July 2023) 

Current Build (July 2023): Front Stage Accuton Automotive C30 AM - Tweeters Accuton Automotive C100 AM - Midranges Focal Utopia 8WM - Midbass Front Subwoofer Illusion C10 Rear Stage Steg MS30, Differential Rear Subwoofers 2 x Audiofrog GB12D4 MTI Stage 2 Box (2.2 CF net) 2" LMI Seat Lift DSP/Signal Brax DSP w/ Conductor Fiio M11 Plus ESS (RSD custom cable - 3.5mm to Coaxial) Topping D10S (Audioquest Pearl USB/Apple CCK3 and Optical Out) LLJ Customs Harness (High Level) for Phone Calls/Chimes/Navigation Amplification Mosconi Pro 5/30 #1 Ch 1/2 - Left Midbass (Bridged) Ch 3 - Left Midrange Ch 4 - Left Tweeter Ch 5 - Left Rear Sub Mosconi Pro 5/30 #2 Ch 1/2 - Right Midbass (Bridged) Ch 3 - Right Midrange Ch 4 - Right Tweeter Ch 5 - Right Rear Sub Mosconi Pro 4/10 Ch 1/2 - Front Sub (Bridged) Ch 3 - Left Rear Fill Ch 4 - Right Rear Fill Power/Wiring 0 AWG KnuKonceptz Kolusus Flex OFC 16 AWG OFC Speaker Wiring 10 AWG OFC Sub Wiring Jim's Machineworks Elite Distro Block Resonix Solderless RCA System Sound Treatment Resonix CLD/CCF/Blackhole Tiles - Doors, Backwall, Floor Resonix Fiber Mat - Headliner, Doors, Front Wheel Well Liners Soundskins Pro Door Kits Custom Fab Work Nick Apicella and Matt Kim - Custom A Pillars and Dash Pods MTI Acoustics Stage 2 Enclsoure DIY Rest of Build

you have absolutely set the bar for an audio build in a truck. did not expect that at all. this is one of my top 3 favorite installs that i found on youtube. i love the equipment you have used and the way you executed the build. not to flashy not to subtle. 10 out of 10 for sure.

Wow just wow amazing👏👏

Nice work.

Fantastic set-up! I also have an AT4, I respect what you have created and I know it sounds incredible! My OCD will not allow me to mix and match my speaker brands, I've very envious in that regard. I'm currently in transition from my late Focal K2's 3-way active, coaxial rear to a complete Focal Utopia in which I will run active 3 ways all the way around! The transition was inspired by the well-renowned Focal Utopia 10WM subwoofers. I ran 2-10WM in an MTI enclosure powered by FDP-1.2000 for some time, since I sold my Utopia's I have purchased countless subwoofers that wouldn't even come close to holding a candle to the 10WM accuracy and depth. I would highly recommend looking into them! Love the system, the rear wall is super sick and I look forward to your future content!

Fantastic level of fabrication🍰 Love everything about this project 🎶

I like it all!! Looking at how I’m going to mount my conductor . Great job all the way around!!

Dang that build looks amazing! I can’t even begin to imagine what it sounds like.

Awesome work. Just beautiful job. Very inspiring

Could be the best install I have seen, and believe me I have seen a lot.

Crazy clean

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That sub enclosure is so nice

The great RickWilson... Seriously nice work here man. You deserve all the props. One day, when my system grows up, it wants to be your system. That Brax alone had me from 6 to midnight... How'd SVR go?

Insane. Stumbled onto your build threads in another forum. Hope you run good this coming weekend.

Amazing stuff!

fantastic build

I really like the full setup and the pillars for the Twitters and the 3 inch , That's what I really want for my truck... Doing My setup slowly but I'll get there lol 2020 GMC Elevation... I Don't really put videos but I put What I'm doing with my 2020 Sierra.

This Peter from PSsound Great job, design, build, execution kudos 👏 🔊🎼🔊🎶🔊🎵👂

Beautiful build. I have a 2024 Sierra 1500. My old SQ system won awards and was 3 way up front Hybrid Audio L8se , L4se , L1v2 . 8 are vented to outside of the vehicle in custom kicks, 3 JL modified HD amps going into Mosconi 6to8pro and 13w7 in box tuned to 34hz so sub plays 20 to 40hz , 8s played 40hz to 200hz and 4inch played 200hz to 10k and tweeters played 10k up. I had custom A pillars ect but now with this new 13.4 screen and Bose system It sounds great and Idk if I want to just add a sub or go all out like us SQ MECA and Iascca guys go lol haha. You did an amazing job and the quality looks top notch. Scott Welch is your man for tuning if your in California. I love the Mosconi amps but they are just huge but worth it. I tell people all the time its less about equipments and more about speakers location and tuning but love your system and would love to hear it. Thanks for posting

Very nice.

Those Equate 18’ns are the bomb. Along with the Great Value 7000 watt Amp for $19.99

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What did you have to do to get a digital coaxial signal for your helix DSP?

Hello, clean install. What coaxial cable are you running for the rca?

​​@lukeouellet What types of sleeves are those on the midbass wiring spade speaker terminals? Also, I see you used a cable grommet for the cables running through your center console. Do you mind sharing what kind you used/where you found them?

Does your backseat seat let down from the factory, or did you customize it so that you have access to the amp rack?

What kind of after market can keep. Oem. Apps like Birds Eye. Lines. Rear parking.

Such a nice build. Very jelouse!!! Im thinking of buying gb subs and its either those or JL w6. What would u say? Gonna be doing a ported box with 10s just because of music preference. Really on the fence on the subs. Top noth build you have!

Yes, amazing build but if you’ve gone this far maybe think about replacing the Topping DAC with a CHORD DAC ? I think they run at 5 volts ?

very nice build, extremely jealous. I would love to know how you bypassed the Bose Amp to connect to the DSP?

Amazing job man. The is one beautiful system. But I have a question for you. I have a 20 Sierra with Bose system. How did you get the signal from the factory radio. Did you go straight to the dsp from the radio or stock amp. Or did you used module like nav-tv. Thank you for your time. And ones again great job man.

Did you need to mod the rear seat back at all to fit or did the extensions allow you to keep the seat factory?

Did you upgrade the battery and alternator? If so, what did you use?? Thanks!

Awesome build. Are you running Michelin defenders or Atx?

I would love to hear this in person few questions as I have a 19 Denali 1500 1 with your master volume knob how do you start your truck as I always get a no key fob detect and I have to place it in that area? Also how did you get wireless CarPlay on your phone?

A thing of beauty!!!! Is this all on the stock battery/alternator? Forgive me if the question is ignorant, but I don't know car audio that well, but I want to add a system to my 2023 silverado 1500 5.3. Everyone keeps telling me to upgrade the alternator if I want more than a 1000 watt amp.

Sick Build! what's something like this cost??

If you don't mind can you tell me what kind of seat lift is that you use

Where did you get the seat lifters from

I sent you a FB request! I am trying to get the details on the Aux power for tuning and Shows! I know about the Anderson Connectors just need solid info on power supply and connections to not destroy my 20 Camry XSE wiring! ja ja ja ja Semper Fi and Can Do OORAH

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