21 Sierra AT4 Subwoofer install

[kdmack]

Just figured I would post some photographs and details about a recent Subwoofer install I did on my AT4 with BOSE.  I noticed there is not a lot of information out there currently on adding a non factory subwoofer.  Overall I found the process very simple especially since I purchased a wiring harness from A.I.S Audio which worked flawlessly.  Loving the amount of extra bass now. Subwoofer is a JL10 thin woofer paired with a Kenwood Exceleron monoblock.  Figured I would post in case anyone else is on the fence about this upgrade and wondering how to accomplish it.

[TxTruckMan]

Nice. But my kids would destroy that Amp. Where did the harness connect to for inputs?

[kdmack]

20 hours ago, TxTruckMan said:

Nice. But my kids would destroy that Amp. Where did the harness connect to for inputs?

Harness plugged into the Bose amp behind the rear seats. Super easy plug and play using the PAC LP7

[AML]

Where did you source the woofer box?

[kdmack]

58 minutes ago, AML said:

Where did you source the woofer box?

Got lucky and found a shop locally who had one that was custom built.  I just needed to carpet it, then I added some extra pieces on the front so I could downward fire it.  I thought it worked out pretty nice.

[bluemonstercali]

Incase in the future you decide the bass is a little too strong like I did you can swap out the 2 front dash speakers to help. I added audio frog 2.5 upfront and it helped with the clarity a ton. I did not amplify them just ran them off of the factory bose amp. 

[snowman44]

Did you trim your underneath storage?  I have same set up with the storage and dont want to have to take whole thing out to put in sub.

[kdmack]

On 9/15/2021 at 2:14 PM, snowman44 said:

Did you trim your underneath storage?  I have same set up with the storage and dont want to have to take whole thing out to put in sub.

Yes I just cut the underneath storage using a very sharp reciprocating saw and also cut in a few notches on my all weather mats. 

[MikeBender1972]

Where exactly is the factory amp? Working on a truck with the bose system and the rear seats don't fold down they have the storage cubbies in the seats. Will I have to remove the rear seats? 

[BT3]

Smack dab in the middle of the back wall along with the inverter 
 

have to remove the back seat to get to it 

 

there are a few tutorials on YouTube on how to do it

 

 

[MikeBender1972]

I found the factory amp. Would anyone know which outputs are for the factory subs in the dash? 

 

I have searched all over A.I.S. Audios website and have not found the harness O.P. is referring to... Maybe I'm blind