6 Speaker System Question: extra dash speaker?

[EJanx07]

Hey All,
Does anyone know, what is under the center grille, on the dash? I have the 6 speaker system in my Lone Star. I seen folks that have the alpine system, posted pics with an “Alpine” Badge on it, making me think THEY have a speaker in there....? just curious if I can install an additional speaker in there. I haven’t removed the grille to look yet, so I wanted to see if you dudes knew

 

[RichInMN]

We just have a hole where a 3.5" speaker would otherwise be

 

[EJanx07]

We just have a hole where a 3.5" speaker would otherwise be

Are there wires run to that location? That would be nice to add the speaker..... BUT with how everything is so integrated in these trucks, I wonder if it would cause issues with the rest of the speakers and/or the ANC?